Pacific Northwest Vegetable Extension Group

of Washington State University, Oregon State University, and University of Idaho

Photo Gallery of Vegetable Problems

Cabbage

(Click on photo to enlarge)


General Cabbage Disease and Pest Management

Cabbage Diseases: Ecology and Control, by Anthony P. Keinath, Marc A. Cubeta, and David B. Langston, Jr.

Cabbage/Kale, Brassicas. infonet-biovision. Photos of various disease and pest problems on brassica crops.

Crop Profile for Cabbage Seed in Washington, by Lindsey J. du Toit, Washington State University Mount Vernon NWREC.


Diseases

Disease: Alternaria black spot
Pathogens: Alternaria brassicae and Alternaria brassicicola

Photo of Alternaria black spot on cabbage Photo of spores of Alternaria brassicae Photo of chains of spores of Alternaria brassicicola growing from an infected cabbage seed. Photo ofcabbage seed plated onto a semi-selective agar medium to detect Alternaria brassicicola.
Leaf spot symptoms caused by Alternaria brassicicola (left) vs. A. brassicae (right). Spores of Alternaria brassicae. Chains of spores of Alternaria brassicicola growing from an infected cabbage seed. Cabbage seed plated onto a semi-selective agar medium to detect Alternaria brassicicola.
Photo Source: Lindsey du Toit Photo Source: Dick Gabrielson Photo Source: Lindsey du Toit
Photo of Alternaria black spot on pods in a cabbage seed crop. Photo of severe Alternaria black spot on pods in a cabbage seed crop. Photo of Alternaria black spot symptoms on a cabbage leaf
Alternaria black spot on pods in a cabbage seed crop. Severe Alternaria black spot on pods in a cabbage seed crop. Alternaria black spot symptoms on a cabbage leaf.
Photo Source: Lindsey du Toit

On-Line Resources:

Pacific Northwest Plant Disease Management Handbook: Cabbage and Cauliflower (Brassica) – Black Spot {Leaf, Stem, or Pod Spots}

Pacific Northwest Plant Disease Management Handbook: Seed Crop, Crucifers – Black Spot {Leaf, Stem or Pod Spots}

Alternaria Diseases of Crucifers. Plant Pathology Fact Sheet PP–34, Florida Cooperative Extension Service/Institute of Food and Agricultural Science/University of Florida.

UC Pest Management Guidelines: Cole Crops: Alternaria Leafspot. UC IPM Online, University of California.

Crucifer Diseases: Alternaria Leaf Spot. AVRDC International Cooperators’ Fact Sheet.

Disease Management: Alternaria Diseases of Brassicas. The Plant Diagnostic Clinic, UMassAmherst.

Disease: Black Leg
Pathogens:Phoma lingam (sexual stage = Leptosphaeria maculans)
Host crops:Most members of the Brassicaceae (Cruciferae) = cabbage family, including broccoli, Brussels sprouts, cabbage, canola, cauliflower, various Chinese brassica vegetables, collard, kale, mizuna, mustard, oilseed rape, oilseed turnip rape, rutabaga, turnip, etc.), Sinapis (white and yellow mustard), and Raphanus (daikon and radish). Several wild species exist that may be infected by P. lingam including Descurainia (tansymustard), Sisymbrium (hedge mustard), and Thlaspi (penny-cress). This is a quarantine disease in five counties in northwestern WA because of the risk of this pathogen to the brassica vegetable seed industry.

hypocotyl infection with pycnidia growout trial  cotyledon symptoms Black leg oozing pycnidia
Black leg symptoms on a cabbage seedling grown from an infested seed lot. Note the small, black fruiting bodies (pycnidia) on the hypocotyl of the seedling. Black leg infection of the cotyledon of a cabbage seedling grown from an infested seed lot. Note the small, black fruiting bodies (pycnidia) on the cotyledon. Pycnidia of Phoma lingam on the base of the stem of a Brassica rapa plant, showing pink cirrhi oozing out of each pycnidium, containing thousands of conidia. The conidia are readily splash-dispersed.
Photo Source: Lindsey du Toit, Washington State University.
Black leg lesion at the base of the stem of an infected plant Phoma leaf spot – Cindy Ocamb Phoma lingam seed assay – cauliflower 19x
Black leg lesion at the base of the stem of an infected plant from a Brassica rapa seed crop. Note the small, black pycnidia embedded in the lesion. Phoma leaf spot lesion with tiny, black pycnidia present in the necrotic, circular lesion, surrounded by a narrow, chlorotic (yellow) halo. Black pycnidia of the black leg fungus, Phoma lingam, on an infected cauliflower seed. Note the amethyst-colored cirrhi (gelatinous matrix) oozing from the pycnidia, which indicates the strain of the pathogen is virulent (able to cause Phoma leaf spot or black leg of brassicas)
Photo Source: Cynthia Ocamb, Oregon State University. Photo Source: Lindsey du Toit, Washington State University.

 

On-Line Resources:

Video: Blackleg Disease and Resistance Management. Published by the Canola Council of Canada.

Pacific Northwest Plant Disease Management Handbook: Cabbage and Cauliflower (Brassica sp.)-Black Leg and Phoma Root Rot

Pacific Northwest Plant Disease Management Handbook: Seed Crop, Crucifers-Blackleg

Black leg in Brassicaceae crops and wild crucifers: 2014 outbreak in the Willamette Valley of Oregon

Black Leg, Light Leaf Spot, and White Leaf Spot, Cynthia Ocamb, PhD., Plant Pathologist, OSU Extension, Associate Professor--Botany & Plant Pathology.

Addressing Blackleg in the Willamette Valley - Temporary rule and proposed changes to the permanent rule of the Oregon Department of Agriculture, Nancy K Osterbauer, State of Oregon, Oregon Department of Agriculture, Plant Protection and Animal Health.

Fungicides for Control of Black Leg, David Priebe, Pesticides Program, Oregon Department of Agriculture.

Disease: Botrytis stem blight
Pathogen: Botrytis cinerea

Photo of Botrytis stem blight on cabbage
Photo Source: D.A. Inglis

On-Line Resources:


 

Disease: Clubroot
Pathogen: Plasmodiophora brassicae
Host crops: Broccoli, cabbage, cauliflower, brassicaceae (cruciferous) weeds, and radish.

Photo of stunting from club root Photo of below-ground symptoms of clubroot. Photo of below-ground symptoms of clubroot.
Stunting from clubroot. Below-ground symptoms of clubroot.
Photo Source: Lindsey du Toit

Disease: Downy mildew
Pathogens: Hyaloperonospora parasitica = Peronospora parasitica
Host crops: Most members of the Brassicaceae (Cruciferae) = cabbage family, including cabbage and cauliflower.

Photo of downy mildew on cabbage Photo of downy mildew on cabbage Photo of downy mildew on cabbage Photo of pod infection
Downy mildew sporulation on cabbage leaves. Sporulation of downy mildew on a cabbage seed pod in a cabbage seed crop.
Photo Source: Lindsey du Toit

On-Line Resources:

Pacific Northwest Plant Disease Management Handbook: Cabbage and Cauliflower (Brassica sp.) – Downy Mildew {Staghead}

Downy Mildew of Crucifers. Plant Pathology Fact Sheet. Florida Cooperative Extension Service.

Brassica Downy Mildew. University of Massachusetts Amherst.

See Brassicaceae: Downy Mildew.

 

Disease: Ring spot
Pathogen: Mycosphaerella brassicicola

Photo of ring spot on cauliflower Photo of ring spot on cauliflower

Photo Source: D.A. Inglis

Insect/Mite Pests

Common name: Diamondback moth
Latin binomial: Plutella xylostella

Photo of diamondback moth pupa on cabbage Photo of diamondback moth larva on cabbage
Diamondback moth pupa with imported cabbageworm hole damage to leaves. Diamondback moth larva on cabbage.
Photo Source: Photographer – Johnny Stark. Submitted by Jenny Glass

On-Line Resources:

Caterpillar Pests of the Cabbage Family. Washington State University Fact Sheet FS018E.

Pacific Northwest Insect Management Handbook. Chapter: Vegetables, Section: Boccoli, Cabbage, other Crucifers.

Common name: Imported cabbage worm
Latin binomial: Pieris rapae

Photo of imported cabbageworm on cabbage
Imported cabbage worm by damaged cabbage leaf.
Photo Source: Photographer – Johnny Stark
Submitted by Jenny Glass

On-Line Resources:

Caterpillar Pests of the Cabbage Family. Washington State University Fact Sheet FS018E.

Pacific Northwest Insect Management Handbook. Chapter: Vegetables, Section: Boccoli, Cabbage, other Crucifers.

 

Common name: Western flower thrips
Latin binomial: Frankliniella occidentalis.
Host crops: Basil, Broccoli, Cabbage, Cauliflower, Cucumber, Onion, Potato, Pumpkin, Squash, Tomato and Watermelon.

Photo of adult Western flower thrips Photo of immature Western flower thips
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. 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.
Photo Source: Michael Bush, WSU Extension, Yakima, WA

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WSU Mount Vernon NWREC, 16650 State Route 536, Mount Vernon, WA 98273-4768, 360-848-6120
Contact Us: Lindsey du Toit and Carol Miles