Presentation by Steve Van Vleet, Washington State University, Whitman County Extension
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Diseases can reduce the yield and nutritional quality of crops. Vectors are organisms that transmit pathogens that cause diseases and can also threaten crops. Some important vectors of plant pathogens in the Pacific Northwest include the potato psyllid that vectors the bacteria that causes Zebra Chip disease in potatoes and onion thrips that vector Iris yellow spot virus in onions.