{"id":140,"date":"2021-06-13T17:54:26","date_gmt":"2021-06-14T00:54:26","guid":{"rendered":"http:\/\/stage.web.wsu.edu\/path-team\/?page_id=140"},"modified":"2024-10-20T22:03:49","modified_gmt":"2024-10-21T05:03:49","slug":"cucumber","status":"publish","type":"page","link":"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/cucurbits\/cucumber\/","title":{"rendered":"Cucumber"},"content":{"rendered":"<div class=\"wsu-row  wsu-color-background--gray-5 wsu-row--thirds\" >\r\n    \n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wsu-cta  wsu-cta--width-inline\" >\n\t<a \t\t\t\t\thref=\"#Diseases12\"\t\n\t\tclass=\"wsu-button \">\n\t\t\t\n\t\tDiseases\t\t\t<\/a>\n<\/div>\n\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wsu-cta  wsu-cta--width-inline\" >\n\t<a \t\t\t\t\thref=\"#InsMite1\"\t\n\t\tclass=\"wsu-button \">\n\t\t\t\n\t\tInsect\/Mite Pests\t\t\t<\/a>\n<\/div>\n\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wsu-cta  wsu-cta--width-inline\" >\n\t<a \t\t\t\t\thref=\"#AbioticProb1\"\t\n\t\tclass=\"wsu-button \">\n\t\t\t\n\t\tAbiotic Problems\t\t\t<\/a>\n<\/div>\n\n<\/div>\r\n\n<\/div>\n\n\n<h2 class=\"wp-block-heading  wsu-heading--style-marked wsu-heading--mark-centered\" id=\"home\">Diseases <\/h2>\n\n\n<div class=\"wsu-row wsu-row--thirds\" >\r\n    \n<div class=\"wsu-column\"  style=\"\">\r\n\t\n\n<ul>\n<li><a href=\"#Angular\">Angular leaf spot<\/a><\/li>\n\n\n\n<li><a href=\"#Black\">Black root rot<\/a><\/li>\n<\/ul>\n\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n\n<ul>\n<li><a href=\"#Curly\">Curly top<\/a><\/li>\n\n\n\n<li><a href=\"#Downy\">Downy mildew<\/a><\/li>\n<\/ul>\n\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n\n<ul>\n<li><a href=\"#Scab\">Scab<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/cucurbits\/#White\">White mold<\/a><\/li>\n<\/ul>\n\n<\/div>\r\n\n<\/div>\n\n\n<h2 class=\"wp-block-heading  wsu-heading--style-marked wsu-heading--mark-centered\">Insect\/Mite Pests<\/h2>\n\n\n\n<ul>\n<li><a href=\"#Western\">Western flower thrips<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading  wsu-heading--style-marked wsu-heading--mark-centered\">Abiotic Problems<\/h2>\n\n\n\n<ul>\n<li><a href=\"#Edema\">Edema<\/a><\/li>\n<\/ul>\n\n\n<div class=\"wsu-row wsu-row--single\" >\r\n    \n<div class=\"wsu-column\"  style=\"\">\r\n\t\n\n<hr class=\"wp-block-separator has-css-opacity\" \/>\n\n\n\n<p class=\"has-text-align-center\">(Click on photo to enlarge)<\/p>\n\n<\/div>\r\n\n<\/div>\n\n\n<h2 class=\"wp-block-heading  wsu-heading--style-marked wsu-heading--mark-centered\" id=\"Diseases12\">Diseases<\/h2>\n\n\n\n<h3 class=\"wp-block-heading  wsu-heading--style-marked wsu-heading--mark-color-vineyard\" id=\"Angular\">Angular leaf spot<\/h3>\n\n\n\n<p class=\"collapse_bottom\"><strong>Disease<\/strong>:&nbsp;Angular leaf spot<br><strong>Pathogen<\/strong>:&nbsp;<em>Pseudomonas syringae&nbsp;pv.&nbsp;lachrymans<\/em><\/p>\n\n\n<div class=\"wsu-row wsu-row--quarters\" >\r\n    \n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/dg46l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg46L-396x264.jpg\" alt=\"Angular leaf spot on cucumber-1\" class=\"wp-image-1313\" width=\"198\" height=\"132\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg46L-396x264.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg46L.jpg 600w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Photo Source: <\/strong>D.A. Inglis<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/dg42l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg42L-396x264.jpg\" alt=\"Angular leaf spot on cucumber-2\" class=\"wp-image-1311\" width=\"198\" height=\"132\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg42L-396x264.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg42L.jpg 600w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Photo Source: <\/strong>D.A. Inglis<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/dg43l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg43L.jpg\" alt=\"Angular leaf spot on cucumber-3\" class=\"wp-image-1312\" width=\"98\" height=\"147\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg43L.jpg 400w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg43L-396x594.jpg 396w\" sizes=\"(max-width: 98px) 100vw, 98px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Photo Source: <\/strong>D.A. Inglis<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n\n<p><\/p>\n\n<\/div>\r\n\n<\/div>\n\n\n<p><strong>On-Line Resources<\/strong>:<\/p>\n\n\n\n<ul>\n<li><a href=\"https:\/\/pnwhandbooks.org\/plantdisease\/host-disease\/cucumber-cucumis-sativus-angular-leaf-spot\">Pacific Northwest Plant Disease Management Handbook: Cucumber (<em>Cucumis sativus<\/em>) \u2013 Angular Leaf Spot<\/a>.<\/li>\n\n\n\n<li><a href=\"http:\/\/hortsense.cahnrs.wsu.edu\/Search\/MainMenuWithFactSheet.aspx?CategoryId=5&amp;PlantDefId=55&amp;ProblemId=214\">Cucumber, Pumpkin, Squash: Angular leaf spot<\/a>, Washington State University Hortsense.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"#home\">Return to the Top<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading  wsu-heading--style-marked wsu-heading--mark-color-vineyard\" id=\"Black\">Black root rot<\/h3>\n\n\n\n<p class=\"wsu-max-width--hero\"><strong>Disease<\/strong>:&nbsp;Black root rot<br><strong>Pathogens<\/strong>:&nbsp;<em>Diaporthe sclerotioides<\/em>&nbsp;(synonym&nbsp;<em>Phomopsis sclerotioides<\/em>)<br><b>Host crops<\/b>: All cucumber cultivars are susceptible. Pumpkin and squash are much more tolerant than cucumber. The squash rootstock&nbsp;<em>Cucurbita ficifolia<\/em>&nbsp;is fairly tolerant. Black root rot of cucumber was first reported in North American in greenhouse cucumber production in British Columbia in 1972. The disease is a problem in greenhouse cucumber production in Europe and in cucumber fields in Japan. Cucumber root rot was found in cucumber crops in fields in northwestern Washington in 2012 and 2017. Cucumber plants start to wilt late in the season, usually after fruit have formed. Wilting develops rapidly over the whole plant, usually without yellowing (chlorosis) of the leaves. Symptoms on roots include salmon-colored to gray or brown lesions, often with black lines (pseudostromata) that demarcate infected areas of roots. Distinct, rectangular, black pseudosclerotia form in individual cells of the cortex. The crown and tap root of infected plants become dry and corky.&nbsp;<em>D. sclerotioides<\/em>&nbsp;occasionally forms black pycnidia in infected roots and crowns, within which only alpha conidia form (no beta conidia). In contrast, pycnidia produced by the cucumber Phomopsis fruit rot pathogen,&nbsp;<em>Diaporthe cucurbitae<\/em>, form both alpha and beta conidia.&nbsp;<em>D. cucurbitae<\/em>&nbsp;does not form pseudosclerotia or the characteristic black lines (pseudostromata) associated with cucumber black root rot. Cucumber black root rot is favored by acid soils (pH &lt; 6.5), water deficit, heat stress, and development of fruit that increase transpirational demand on the root system.<\/p>\n\n\n<div class=\"wsu-row wsu-row--quarters\" >\r\n    \n<div class=\"wsu-column\"  style=\"\">\r\n\t\n\n<figure class=\"wp-block-image alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucurbits-black-root-rot-01l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucurbits-black-root-rot-01L-396x259.jpg\" alt=\"Black root rot symptoms on cucurbits-1\" class=\"wp-image-1315\" width=\"198\" height=\"130\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucurbits-black-root-rot-01L-396x259.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucurbits-black-root-rot-01L.jpg 1280w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Wilting of cucumber plants in a field in western Washington as a result of black root rot caused by <i>Diaporthe sclerotioides.<\/i><br><strong>Photo Source: <\/strong>Haruka Fukada, Washington State University\n<\/figcaption><\/figure>\n\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n\n<figure class=\"wp-block-image alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucurbits-black-root-rot-02l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucurbits-black-root-rot-02L-396x151.jpg\" alt=\"Black root rot symptoms on cucurbits-2\" class=\"wp-image-1316\" width=\"198\" height=\"76\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucurbits-black-root-rot-02L-396x151.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucurbits-black-root-rot-02L.jpg 1280w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Distinct pink-brown to dark-gray lesions, some demarcated by black lines (pseudo-stromata), on the roots of a cucumber plant infected with the black root rot pathogen, <i>Diaporthe sclerotioides.<\/i><br><strong>Photo Source: <\/strong>Haruka Fukada, Washington State University\n<\/figcaption><\/figure>\n\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucurbits-black-root-rot-03l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucurbits-black-root-rot-03L-396x315.jpg\" alt=\"Black root rot symptoms on cucurbits-3\" class=\"wp-image-1317\" width=\"198\" height=\"158\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucurbits-black-root-rot-03L-396x315.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucurbits-black-root-rot-03L.jpg 1280w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Distinct black lines (pseudo-stromata) formed by the black root rot pathogen, Diaporthe sclerotioides, in the roots of an infected cucumber plant.<br><strong>Photo Source: <\/strong>Haruka Fukada, Washington State University<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n\n<figure class=\"wp-block-image alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucurbits-black-root-rot-04l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucurbits-black-root-rot-04L-396x283.jpg\" alt=\"Black root rot symptoms on cucurbits-4\" class=\"wp-image-1318\" width=\"198\" height=\"142\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucurbits-black-root-rot-04L-396x283.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucurbits-black-root-rot-04L.jpg 1280w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Distinct, rectangular pseudosclerotia in a secondary cucumber root infected with the black root rot pathogen, <i>Diaporthe sclerotioides.<\/i>\n<br><strong>Photo Source: <\/strong>Haruka Fukada, Washington State University<\/figcaption><\/figure>\n\n<\/div>\r\n\n<\/div>\n\n\n<p><strong>Online Resources:<\/strong><\/p>\n\n\n\n<ul>\n<li><a href=\"https:\/\/www.seminis-us.com\/resources\/disease-guides\/cucurbit\/black-root-cucurbits\/\">Black Root of Cucurbits, Disease Guide<\/a>, Seminis Vegetable Seeds, Inc.<\/li>\n\n\n\n<li> <span style=\"font-size: inherit\">Cucumber (<\/span><i style=\"font-size: inherit\">Cucumis sativa<\/i><span style=\"font-size: inherit\">)-<\/span><a style=\"font-size: inherit\" href=\"https:\/\/pnwhandbooks.org\/plantdisease\/host-disease\/cucumber-cucumis-sativa-black-root-rot\">Black Root Rot<\/a><span style=\"font-size: inherit\">, PNWHandbooks.<\/span> <\/li>\n<\/ul>\n\n\n\n<p><strong>Cultural control:<\/strong><\/p>\n\n\n\n<ul>\n<li>Do not plant cucurbits for consecutive years in the same field.<\/li>\n\n\n\n<li>Use limestone to increase the soil pH above 6.5.<\/li>\n\n\n\n<li>Avoid moisture stress.<\/li>\n\n\n\n<li>Avoid moving soil from infested fields on equipment, shoes, vehicle tires, etc.<\/li>\n\n\n\n<li>Remove diseased plants after harvest.<\/li>\n\n\n\n<li>Rootstocks of the squash Cucurbita ficifolia are not as susceptible to cucumber black root rot as Cucumis sativa.<\/li>\n<\/ul>\n\n\n\n<p><strong>Chemical control:<\/strong><\/p>\n\n\n\n<p>Soil fumigation can reduce the population of propagules (pseudosclerotia and pseudostramata) of D. sclerotioides in the soil but will not eliminate the pathogen. Similarly, soil steam sterilization can control black root rot, although the fungus can reinvade steamed soil rapidly.<\/p>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"#home\">Return to the Top<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading  wsu-heading--style-marked wsu-heading--mark-color-vineyard\" id=\"Curly\">Curly top<\/h3>\n\n\n\n<p class=\"wsu-max-width--hero\"><strong>Disease<\/strong>:&nbsp;Curly top<br><strong>Pathogen<\/strong>: Various strains of&nbsp;Beet <em>curly top virus<\/em>&nbsp;(BCTV), which are vectored by the beet leafhopper (<em>Circulifer tenellus<\/em>)<br><strong>Host crops<\/strong>: Numerous plant species including many vegetables such as <a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/bean\/#CurlyTop\">bean<\/a>, beet, carrot, &nbsp;<a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/eggplant\/#Curlytop\">eggplant<\/a>, <a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/coriander-cilantro\/#Curlytop\">coriander<\/a>, pepper, <a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/potato\/#Curlytop\">potato<\/a>, <a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/tomato\/#Curlytop\">tomato<\/a>, various cucurbits such as &nbsp;<a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/cucurbits\/squash\/#Curlytop\">squash<\/a>, &nbsp;<a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/cucurbits\/pumpkin\/#Curlytop\">pumpkin<\/a>,&nbsp;<a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/cucurbits\/watermelon\/#Curlytop\">watermelon<\/a>, watermelon, etc.<\/p>\n\n\n<div class=\"wsu-row wsu-row--thirds\" >\r\n    \n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/pumpkin-curly-top-1l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/pumpkin-curly-top-1L-396x315.jpg\" alt=\"symptoms of curly top on pumpkin leaves-1\" class=\"wp-image-1321\" width=\"198\" height=\"158\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/pumpkin-curly-top-1L-396x315.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/pumpkin-curly-top-1L.jpg 750w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Symptoms of curly top on pumpkin leaves. Note yellowing of the foliage.<br><strong>Photo Source: <\/strong>Ken Eastwell, Washington State University virologist<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/squash-curly-top-3l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/squash-curly-top-3L-396x264.jpg\" alt=\"curly top symptoms on acorn squash leaves\" class=\"wp-image-1322\" width=\"198\" height=\"132\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/squash-curly-top-3L-396x264.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/squash-curly-top-3L.jpg 650w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Squash, acorn<br><strong>Photo Source: <\/strong>Phil Ham, OSU plant pathologist<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/squash-curly-top-4l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/squash-curly-top-4L-396x252.jpg\" alt=\"symptoms of curly top on squash leaves\" class=\"wp-image-1323\" width=\"198\" height=\"126\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/squash-curly-top-4L-396x252.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/squash-curly-top-4L.jpg 650w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Squash<br><strong>Photo Source: <\/strong>Phil Ham, OSU plant pathologist<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n<\/div>\n\n\n<p><strong>On-Line Resources<\/strong>:<\/p>\n\n\n\n<ul>\n<li><a href=\"https:\/\/pnwhandbooks.org\/plantdisease\/host-disease\/cucumber-cucumis-sativus-curly-top\">Pacific Northwest Plant Disease Management Handbook: Cucumber (<em>Cucumis sativus<\/em>) \u2013 Curly Top<\/a>.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"#home\">Return to the Top<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading  wsu-heading--style-marked wsu-heading--mark-color-vineyard\" id=\"Downy\">Downy mildew<\/h3>\n\n\n\n<p><strong>Disease<\/strong>:&nbsp;Downy Mildew<br><strong>Pathogen<\/strong>:&nbsp;<em>Pseudoperonospora cubensis<\/em><\/p>\n\n\n<div class=\"wsu-row wsu-row--quarters\" >\r\n    \n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucumber-downy-mildew-4l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-4L.jpg\" alt=\"cucumber-downy-mildew symptoms-1\" class=\"wp-image-1328\" width=\"198\" height=\"149\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-4L.jpg 650w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-4L-396x297.jpg 396w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Angular, chlorotic lesions on the upper surface of cucumber leaves infected with downy mildew. Note also the light gray downy mildew sporulation on the immature cucumber fruit to the right.<br><strong>Photo Source: <\/strong>Lindsey du Toit, Washington State University<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucumber-downy-mildew-5l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-5L.jpg\" alt=\"severe lesions on the upper surface of a cucumber leaf infected with downy mildew\" class=\"wp-image-1329\" width=\"198\" height=\"149\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-5L.jpg 650w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-5L-396x297.jpg 396w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Severe, angular, necrotic lesions on the upper surface of a cucumber leaf infected with downy mildew.<br><strong>Photo Source: <\/strong>Lindsey du Toit, Washington State University<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n\n<figure class=\"wp-block-image alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucumber-downy-mildew-7l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-7L.jpg\" alt=\"cucumber-downy-mildew symptoms-2\" class=\"wp-image-1331\" width=\"198\" height=\"149\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-7L.jpg 700w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-7L-396x297.jpg 396w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Dark gray sporulation of the downy mildew pathogen\nin angular lesions viewed from the lower surface of a cucumber leaf.<br><strong>Photo Source: <\/strong>Lindsey du Toit, Washington State University<\/figcaption><\/figure>\n\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n\n<figure class=\"wp-block-image alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucumber-downy-mildew-6l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-6L.jpg\" alt=\"cucumber-downy-mildew symptoms-3\" class=\"wp-image-1330\" width=\"198\" height=\"149\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-6L.jpg 700w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-6L-396x297.jpg 396w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Dark gray sporulation of the downy mildew pathogen\nin angular lesions viewed from the lower surface of a cucumber leaf.<br><strong>Photo Source: <\/strong>Lindsey du Toit, Washington State University<\/figcaption><\/figure>\n\n<\/div>\r\n\n<\/div>\n\n<div class=\"wsu-row wsu-row--quarters\" >\r\n    \n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucumber-downy-mildew-1l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-1L.jpg\" alt=\"downy mildew sporangia on leaf surface\" class=\"wp-image-1325\" width=\"198\" height=\"149\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-1L.jpg 800w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-1L-396x297.jpg 396w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Closeup of sporangia on the leaf surface<br><strong>Photo Source: <\/strong>Jenny Glass<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucumber-downy-mildew-2l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-2L.jpg\" alt=\"Microscopic photo of downy mildew sporangia-1\" class=\"wp-image-1326\" width=\"198\" height=\"149\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-2L.jpg 800w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-2L-396x297.jpg 396w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Microscopic photo of sporangiophores and sporangia of the cucumber downy mildew pathogen,<i> Pseudoperonospora cubensis.<\/i><br><strong>Photo Source: <\/strong>Jenny Glass<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucumber-downy-mildew-3l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-3L.jpg\" alt=\"Microscopic photo of downy mildew sporangia-2\" class=\"wp-image-1327\" width=\"198\" height=\"149\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-3L.jpg 800w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-downy-mildew-3L-396x297.jpg 396w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Microscopic photo of sporangiophores and sporangia of the cucumber downy mildew pathogen,<i> Pseudoperonospora cubensis.<\/i><br><strong>Photo Source: <\/strong>Jenny Glass<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n\n<p><\/p>\n\n<\/div>\r\n\n<\/div>\n\n\n<p><strong>On-Line Resources<\/strong>:<\/p>\n\n\n\n<ul>\n<li><a href=\"https:\/\/pnwhandbooks.org\/plantdisease\/cucumber-cucumis-sativus-downy-mildew\">Pacific Northwest Plant Disease Management Handbook: Cucumber (<em>Cucumis sativus<\/em>) \u2013 Downy Mildew<\/a>.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.veggies.msu.edu\/\">Cucurbit Downy Mildew News<\/a>, Michigan State University.<\/li>\n\n\n\n<li><a href=\"https:\/\/attra.ncat.org\/attra-pub-summaries\/?pub=122\">Downy Mildew Control in Cucurbits<\/a>, National Sustainable Agriculture Information Service.<\/li>\n\n\n\n<li><a href=\"https:\/\/s3.wp.wsu.edu\/uploads\/sites\/2723\/2021\/07\/8-25-downy-mildew-pictures-MSU.pdf\">Downy mildew symptoms on cucurbit plants (pdf)<\/a>. Michigan State University.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"#home\">Return to the Top<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading  wsu-heading--style-marked wsu-heading--mark-color-vineyard\" id=\"Scab\">Scab<\/h3>\n\n\n\n<p><strong>Disease<\/strong>:&nbsp;Scab<br><strong>Pathogen<\/strong>:&nbsp;<em>Cladosporium cucumerinum<\/em><\/p>\n\n\n<div class=\"wsu-row wsu-row--quarters\" >\r\n    \n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/dg44l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg44L-396x264.jpg\" alt=\"Scab on cucumber-1\" class=\"wp-image-1337\" width=\"198\" height=\"132\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg44L-396x264.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg44L.jpg 600w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Photo Source: <\/strong>D.A. Inglis<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/dg45l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg45L-396x264.jpg\" alt=\"Scab on cucumber-2\" class=\"wp-image-1338\" width=\"198\" height=\"132\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg45L-396x264.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/dg45L.jpg 600w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Photo Source: <\/strong>D.A. Inglis<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n\n<p><\/p>\n\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n\n<p><\/p>\n\n<\/div>\r\n\n<\/div>\n\n\n<p><strong>On-Line Resources<\/strong>:<\/p>\n\n\n\n<ul>\n<li><a href=\"https:\/\/pnwhandbooks.org\/plantdisease\/host-disease\/cucumber-cucumis-sativus-scab-gummosis\">Pacific Northwest Plant Disease Management Handbook: Cucumber (<em>Cucumis sativus<\/em>) \u2013 Scab {Gummosis}<\/a>.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"#home\">Return to the Top<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading  wsu-heading--style-marked wsu-heading--mark-centered\" id=\"InsMite1\">Insect\/Mite Pests<\/h2>\n\n\n\n<h3 class=\"wp-block-heading  wsu-heading--style-marked wsu-heading--mark-color-vineyard\" id=\"Western\">Western flower thrips<\/h3>\n\n\n\n<p class=\"has-text-align-left collapse_bottom wsu-align-item--left\"><strong>Common name<\/strong> (of damaging stage):&nbsp;Western flower thrips<br><strong>Latin binomia<\/strong>l:&nbsp;<i>Frankliniella occidentalis<\/i>.<br><strong>Host crops<\/strong>: <a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/basil\/#Thrips\">Basil<\/a>,&nbsp;<a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/brassicaceae\/broccoli\/#Western\">Broccoli<\/a>,&nbsp;<a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/cabbage\/#Western\">Cabbage<\/a>,&nbsp;<a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/brassicaceae\/cauliflower\/#Western\">Cauliflower<\/a>,&nbsp;<a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/onion-allium\/#Thrips\">Onion<\/a>,&nbsp;<a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/potato\/#thrips\">Potato<\/a>,&nbsp;<a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/cucurbits\/pumpkin\/#thrips\">Pumpkin<\/a>,&nbsp;<a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/cucurbits\/squash\/#thrips\">Squash<\/a>,&nbsp;<a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/tomato\/#thrips\">Tomato<\/a>&nbsp;and&nbsp;<br><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/cucurbits\/watermelon\/#thrips\">Watermelon<\/a>.<\/p>\n\n\n<div class=\"wsu-row wsu-row--quarters\" >\r\n    \n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucumber-western-flower-thrips1l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-Western-flower-thrips1L-396x248.jpg\" alt=\"adult Western flower thrips-1\" class=\"wp-image-1052\" width=\"198\" height=\"124\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-Western-flower-thrips1L-396x248.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-Western-flower-thrips1L.jpg 468w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Adult Western flower thrips are minute (less than 1\/8 inch long) narrow-bodied insects that range from straw to dark yellowish-brown in color. Their four wings are very narrow and characterized by long fringed hairs.<br><strong>Photo Source: <\/strong>Michael Bush, WSU Extension, Yakima, WA<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucumber-western-flower-thrips2l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-Western-flower-thrips2L.jpg\" alt=\"immature Western flower thips\" class=\"wp-image-1053\" width=\"198\" height=\"149\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-Western-flower-thrips2L.jpg 468w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-Western-flower-thrips2L-396x297.jpg 396w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Immature Western flower thrips resemble the adults but are smaller, wingless and translucent yellow in color. There are multiple generations per year and thrips may invade vegetable fields when alternate flowering plants dry up in the summer or when an adjacent host crop is harvested.<br><strong>Photo Source: <\/strong>Michael Bush, WSU Extension, Yakima, WA<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucumber-western-flower-thrips3l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-Western-flower-thrips3L-396x263.jpg\" alt=\"thip damage to leaves\" class=\"wp-image-1342\" width=\"198\" height=\"132\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-Western-flower-thrips3L-396x263.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-Western-flower-thrips3L.jpg 468w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Thrips rasp (by puncturing individual surface cells and sucking cellular contents) the surface of fresh young plant tissues as they feed. Their feeding can weaken and deform flowers and cause a white specking or silvery discoloration on the underside of leaves. Under severe infestations, the specking can be seen as yellowing and fading of healthy green leaf color on the upper leaf surface as well.<br><strong>Photo Source: <\/strong>Michael Bush, WSU Extension, Yakima, WA<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/cucumber-western-flower-thrips4l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-Western-flower-thrips4L-396x263.jpg\" alt=\"thrip damage to cucumber fruit\" class=\"wp-image-1343\" width=\"198\" height=\"132\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-Western-flower-thrips4L-396x263.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/cucumber-Western-flower-thrips4L.jpg 468w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">When given the opportunity, thrips will feed on the surface cells of cucumber fruit, leaving ghostly white stippling. This damage is cosmetic only, limited to the skin of the fruit. Early surface damage to the cucumber can appear as corky patches, negatively impacting the surface finish.<br><strong>Photo Source: <\/strong>Michael Bush, WSU Extension, Yakima, WA<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n<\/div>\n\n\n<p><strong>On-Line Resources<\/strong>:<\/p>\n\n\n\n<ul>\n<li><a href=\"https:\/\/uspest.org\/pdf\/reb114.pdf\">Western Flower Thrips Thysanoptera: Thripidae&nbsp;<em>Frankiniella occidentalis (pdf)<\/em><\/a>.<\/li>\n\n\n\n<li><a href=\"https:\/\/uspest.org\/pnw\/insects\">Pacific Northwest Insect Management Handbook<\/a>. Chapter: Vegetables, Section: Cucumber (garden symphylan to wireworm).<\/li>\n\n\n\n<li><a href=\"https:\/\/pnwhandbooks.org\/insect\/vegetable\/irish-potato\">Pacific Northwest Insect Management Handbook<\/a>. Chapter: Irish Potatoes, Section: Lygus bug to Thrips.<\/li>\n\n\n\n<li><a href=\"https:\/\/uspest.org\/pnw\/insects?22VGTB14.dat\">Pacific Northwest Insect Management Handbook<\/a>. Chapter: Vegetables, Section: Broccoli, Cabbage Other Crucifers.<\/li>\n\n\n\n<li><a href=\"https:\/\/hortsense.cahnrs.wsu.edu\/fact-sheet\/bean-thrips\/\">Vegetables: Bean: Thrips<\/a>. Washington State University Hortsense.<\/li>\n\n\n\n<li><a href=\"http:\/\/hortsense.cahnrs.wsu.edu\/Search\/MainMenuWithFactSheet.aspx?CategoryId=5&amp;PlantDefId=44&amp;ProblemId=194\">Vegetables: Broccoli, Cole crops: Thrips<\/a>. Washington State University Hortsense.<\/li>\n\n\n\n<li>See&nbsp;<a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/photo-gallery-of-vegetable-problems\/diseases-pests-and-other-problems-common-to-many-vegetables\/#thrips\">Diseases, pests, and other problems common to many vegetables: Western flower thrips<\/a>.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"#home\">Return to the Top<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading  wsu-heading--style-marked wsu-heading--mark-centered\" id=\"AbioticProb1\">Abiotic Problems Common to Cucurbits<\/h2>\n\n\n\n<h3 class=\"wp-block-heading  wsu-heading--style-marked wsu-heading--mark-color-vineyard\" id=\"Edema\">Edema<\/h3>\n\n\n\n<p class=\"wsu-max-width--hero\"><b>Problem<\/b>:&nbsp;Edema<br>A<strong>&nbsp;physiological problem<\/strong>: prominent when air is cooler than the soil, soil moisture is high, and relative humidity is high. The low plant transpiration rates combined with an increase in water absorption by roots from the soil leads to increased cell turgor pressure, resulting in eruption of epidermal cells as the inner cells enlarge. Protrusion of the inner cells causes epidermal cells to die and discolor, resulting in a \u2019warty\u2019 appearance that can be misidentified as a disease. In addition to foliar symptoms on some hosts, many cucurbit crops develop wart-like protruberances on the fruit.<\/p>\n\n\n<div class=\"wsu-row wsu-row--quarters\" >\r\n    \n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/pumpkin-edema-1l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/pumpkin-edema-1L.jpg\" alt=\"edema symptoms on pumpkin-1\" class=\"wp-image-1301\" width=\"198\" height=\"264\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/pumpkin-edema-1L.jpg 638w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/pumpkin-edema-1L-396x528.jpg 396w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Severe wart-like growths on a pumpkin caused by edema.<br><strong>Photo Source: <\/strong>Lindsey du Toit, Washington State University.<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n\n<figure class=\"wp-block-image alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/pumpkin-edema-2l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/pumpkin-edema-2L-396x223.jpg\" alt=\"edema symptoms on pumpkin-2\" class=\"wp-image-1302\" width=\"198\" height=\"112\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/pumpkin-edema-2L-396x223.jpg 396w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/pumpkin-edema-2L.jpg 850w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Close-up view of severe edema symptoms on a pumpkin.<br><strong>Photo Source:\n<\/strong>Phil Hamm, Oregon State University.<\/figcaption><\/figure>\n\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/winter-squash-oedema-1l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/winter-squash-oedema-1L.jpg\" alt=\"edema symptoms on squash-1\" class=\"wp-image-1303\" width=\"198\" height=\"149\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/winter-squash-oedema-1L.jpg 850w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/winter-squash-oedema-1L-396x297.jpg 396w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Small but extensive symptoms of edema on a winter squash.<br><strong>Photo Source: <\/strong>Lindsey du Toit, Washington State University<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n\n<div class=\"wsu-column\"  style=\"\">\r\n\t\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-medium is-resized\"><a href=\"https:\/\/mtvernon.wsu.edu\/path_team\/winter-squash-oedema-2l\/\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/winter-squash-oedema-2L.jpg\" alt=\"edema symptoms on squash-2\" class=\"wp-image-1304\" width=\"198\" height=\"149\" srcset=\"https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/winter-squash-oedema-2L.jpg 850w, https:\/\/wpcdn.web.wsu.edu\/extension\/uploads\/sites\/31\/winter-squash-oedema-2L-396x297.jpg 396w\" sizes=\"(max-width: 198px) 100vw, 198px\" \/><\/a><figcaption class=\"wp-element-caption\">Close-up view of edema symptoms on the surface of a winter squash.<br><strong>Photo Source: <\/strong>Lindsey du Toit, Washington State University<\/figcaption><\/figure><\/div>\n<\/div>\r\n\n<\/div>\n\n\n<p><strong>On-Line Resources<\/strong>:<\/p>\n\n\n\n<ul>\n<li><a href=\"http:\/\/www.omafra.gov.on.ca\/IPM\/english\/cucurbits\/diseases-and-disorders\/oedema.html\">OEDEMA<\/a> &#8211; Ontario CropIPM, diseases-and-disorders.<\/li>\n\n\n\n<li><a href=\"http:\/\/ncsupdicblog.blogspot.com\/2011\/12\/edema.html\">Edema<\/a> &#8211; Plant Disease and Insect Clinic, North Carolina State University.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"#home\">Return to the Top<\/a><\/p>\n\n\n<div class=\"wsu-callout  wsu-border--add-top\" >\r\n        \n<div class=\"wsu-note\">\n\t\n\t\t\t<div class=\"wsu-note__title\">\n\t\t\tPDF Accessibility\t\t<\/div>\n\t\t\n\t\n\n<p class=\"wsu-max-width--hero\">If you need the content provided on this site in an alternate format or for further information on the Vegetable Seed Pathology program, <\/p>\n\n\n\n<p class=\"wsu-max-width--hero\">please contact:&nbsp;<strong>Lindsey du Toit at&nbsp;<a href=\"mailto:dutoit@wsu.edu\">dutoit@wsu.edu<\/a>&nbsp;or at 360-848-6140<\/strong>.<\/p>\n\n<\/div>\n\n<\/div>\r\n\n        <div id=\"cahnrs-back-to-top\" class=\"cahnrs-back-to-top\" hidden aria-hidden=\"true\">\n            <a id=\"cahnrs-back-to-top-btn\" class=\"cahnrs-back-to-top__btn\" href=\"#product-top\" aria-label=\"Back to top\">\n                <span class=\"cahnrs-back-to-top__icon\" aria-hidden=\"true\">\u2191<\/span>\n                <span class=\"cahnrs-back-to-top__label\">Back to top<\/span>\n            <\/a>\n        <\/div>\n\n<section  class=\"wsu-section wsu-width--full\"  >\r\n    <div class=\"wsu-section__inner wsu-width--content\">    \n\n<p class=\"wsu-max-width--hero wsu-spacing-after--none wsu-spacing-bottom--none wsu-spacing-before--default\">Our pages provide links to external sites for the convenience of users. WSU Extension does not manage these external sites, nor does Extension review, control, or take responsibility for the content of these sites. These external sites do not implicitly or explicitly represent official positions and policies of WSU Extension.<\/p>\n\n    <\/div><\/section>\n        <div id=\"cahnrs-back-to-top\" class=\"cahnrs-back-to-top\" hidden aria-hidden=\"true\">\n            <a id=\"cahnrs-back-to-top-btn\" class=\"cahnrs-back-to-top__btn\" href=\"#product-top\" aria-label=\"Back to top\">\n                <span class=\"cahnrs-back-to-top__icon\" aria-hidden=\"true\">\u2191<\/span>\n                <span class=\"cahnrs-back-to-top__label\">Back to top<\/span>\n            <\/a>\n        <\/div>\n        <div id=\"cahnrs-back-to-top\" class=\"cahnrs-back-to-top\" hidden aria-hidden=\"true\">\n            <a id=\"cahnrs-back-to-top-btn\" class=\"cahnrs-back-to-top__btn\" href=\"#product-top\" aria-label=\"Back to top\">\n                <span class=\"cahnrs-back-to-top__icon\" aria-hidden=\"true\">\u2191<\/span>\n                <span class=\"cahnrs-back-to-top__label\">Back to top<\/span>\n            <\/a>\n        <\/div>","protected":false},"excerpt":{"rendered":"<p>[action label=&quot;Insect\/Mite Pests&quot; link=&quot;https:\/\/stage.web.wsu.edu\/path-team\/photo-gallery-of-vegetable-problems\/cucurbits\/cucumber\/#Insect\/Mite Pests&quot; style=&quot;in-page-action&quot; ][action label=&quot;Abiotic Problems&quot; link=&quot;https:\/\/stage.web.wsu.edu\/path-team\/photo-gallery-of-vegetable-problems\/cucurbits\/cucumber\/#Abiotic Problems&quot; style=&quot;in-page-action&quot; ]DiseasesAngular leaf spot Black root rotCurly top Downy MildewScab White moldInsect\/Mite Pests Western flower thrips Abiotic Problems Edema(Click on photo to enlarge) Diseases&amp;hellip;<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":128,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_expiration_date":""},"categories":[],"tags":[],"_links":{"self":[{"href":"https:\/\/mtvernon.wsu.edu\/path_team\/wp-json\/wp\/v2\/pages\/140"}],"collection":[{"href":"https:\/\/mtvernon.wsu.edu\/path_team\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/mtvernon.wsu.edu\/path_team\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/mtvernon.wsu.edu\/path_team\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/mtvernon.wsu.edu\/path_team\/wp-json\/wp\/v2\/comments?post=140"}],"version-history":[{"count":2,"href":"https:\/\/mtvernon.wsu.edu\/path_team\/wp-json\/wp\/v2\/pages\/140\/revisions"}],"predecessor-version":[{"id":8204,"href":"https:\/\/mtvernon.wsu.edu\/path_team\/wp-json\/wp\/v2\/pages\/140\/revisions\/8204"}],"up":[{"embeddable":true,"href":"https:\/\/mtvernon.wsu.edu\/path_team\/wp-json\/wp\/v2\/pages\/128"}],"wp:attachment":[{"href":"https:\/\/mtvernon.wsu.edu\/path_team\/wp-json\/wp\/v2\/media?parent=140"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mtvernon.wsu.edu\/path_team\/wp-json\/wp\/v2\/categories?post=140"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mtvernon.wsu.edu\/path_team\/wp-json\/wp\/v2\/tags?post=140"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}