Diseases |
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Ramularia leaf spot | Rhizoctonia basal petiole and crown infection | ||
Insect/Mite Pests |
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Aphids | Springtails |
(Click on photo to enlarge)
Diseases
Disease: Ramularia leaf spot
Pathogen: Ramularia beticola
Host crops: Most vegetables in the Chenopodiaceae, i.e., sugar beet, table beet, and Swiss chard.
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Ramularia leaf spot on Swiss chard leaves. | ||||
Photo Source: D.A. Inglis, Washington State University |
Photo Source: Lindsey du Toit, Washington State University |
Online Resources:
Disease: Rhizoctonia basal petiole and crown infection
Pathogens:Rhizoctonia
Host crops: Many vegetables are susceptible to infection by Rhizoctonia spp., which are common soilborne fungi. In beet and Swiss chard, these fungi can infect the base of petioles and the crown or main root at or below the soil surface, particularly in moist soil conditions. During very wet conditions, infection can also occur on the leaves.
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Photo Source: Lindsey du Toit, Washington State University |
Online Resources:
Pacific Northwest Plant Disease Management Handbook
Insect/Mite Pests
Common name: Aphids (various types)
Latin binomial: Aphis fabae (bean aphid), Myzus persicae (green peach aphid)
Host crops: Table beet, sugar beet, Swiss chard, and various other vegetable and weed plant species
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Photo Source: Lindsey du Toit, Washington State University |
Online Resources:
http://insect.pnwhandbooks.org/vegetable/vegetable-pests/hosts-and-pests/chard-swiss-aphid
Common Name: Lygus bugs
Latin binomial: Lygus spp.
Host crops: Numerous different species of vegetables and other crops, e.g., alfalfa, beet, cabbage, carrot, spinach, Swiss chard, etc. Lygus bugs can cause different types of damage to various growth stages of different crops. They cause blackheart on celery, blasting on flower tissues, collapse of asparagus spears, decreased yields in carrot, beet, spinach, and other seed crops, etc.
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Photo Source: Bev Gerdeman, WSU Entomologist |
Online Resources:
Pacific Northwest Insect Management Handbook: Vegetable crop pests – Lygus bug
Common Name: Springtails (subterranean types)
Latin binomial: Order Collembola. There are numerous types of springtails or collembola, which are divided into two groups – subterranean springtails and surface springtails.
Host crops: Multiple vegetables, but most damage has been reported on spinach and beets, primarily in heavier, organic soils during very wet, cool spring conditions.
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A subterranean springtail extracted from soil in a spinach seed crop. | |
Photo Source: Lindsey du Toit, Washington State University |
Online Resources:
Springtails Springtails in Sugarbeet: Identification, Biology, and Management. North Dakota State University, Fargo
Control of Subterranean Springtails in Sugarbeet Using Granular, Liquid, and Seed Treatment Insecticides. North Dakota State University, Fargo
Springtail feeding on emerging crops (especially sugarbeet). Michigan State University
Pest: Springtail. Pest Spotter, Bayer CropScience