Photo Gallery of Vegetable Problems
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Common Diseases of Lettuce, New South Wales Department of Primary Industries, Australia. Includes photos of disease symptoms on lettuce.
Photo Source: D.A. Inglis
Photo Source: D.A. Inglis
Lettuce: Anthracnose, Washington State University Hortsense
|Severe symptoms of lettuce downy mildew.||Sporulation of Bremia lactucae on the lower leaf surface.||Sporangiophores and sporangia of Bremia lactucae.|
|Photo Source: Lindsey du Toit|
See Lettuce: Downy Mildew. UC Pest Management Guidelines. UC IPM Online, University of California
See Models: Diseases: Lettuce: Downy Mildew. UC IPM Online, University of California
|Symptoms resulting from basal infection of the stem from Sclerotinia inoculum in the soil.||Aerial infection of lettuce from ascospores released by the apothecia.|
|Photo Source: Lindsey du Toit||Photo Source: Bo-Ming Wu|
|Sclerotinia sclerotiorum asci and ascospores.||Sclerotinia sclerotiorum spore release from ascospores on the surface of infested soil.||Sclerotinia sclerotiorum sclerotium with three apothecia.|
|Photo Source: Bo-Ming Wu|
UC Pest Management Guidelines: Lettuce: Lettuce Drop. UC IPM Online. University of California.
Diseases of lettuce ( Lactuca sativa ) in Arizona: Leaf drop. Extension Plant Pathology, The University of Arizona.
Evaluation of Products to Manage Sclerotinia Leaf Drop of Lettuce in 2003. The University of Arizona Cooperative Extension.
Important New York Vegetable Diseases: LETTUCE: Drop (Sclerotinia sclerotiorum). Vegetable MD Online, Cornell University.
Latin binomial: Ctenicera spp. and Limonius spp. Several kinds of wireworms are in the Pacific Northwest. Wireworms causing the most damage in irrigated areas are the Pacific Coast wireworm (Limonius canus), the sugar beet wireworm (L. californicus), the western field wireworm (L. infuscatus), and the Columbia Basin wireworm (L. subauratus). The Pacific Coast and sugar beet wireworms are the most common. Where annual rainfall is <15 inches, the Great Basin wireworm (Ctenicera pruinina) may be a problem, especially when irrigated crops are grown on sagebrush or dry wheat land. This species usually disappears after a few years of irrigation, but may be replaced by Limonius spp. which are favored by moist conditions. West of the Cascades, other wireworm species are pests, including Agriotes spp.
Host crops: All crops are susceptible to wireworm, but this pest is most destructive on beans, carrot, corn, grain, onion, potatoes, spinach seed crops, and other annual crops in the PNW.
|Damage to Romaine lettuce caused by wireworms|
|Photo Source: Photo courtesy of Rachel Bomberger, Washington State University|
Managing Wireworms in Vegetable Crops. Ontario Ministry of Agriculture and Food
Wireworms. VegEdge, University of Minnesota.
Wireworm Field Guide - A guide to the identification and control of wireworms, Syngenta Crop Protection Canada, Inc.
Wireworm Biology and Nonchemical Management in Potatoes in the Pacific Northwest, N. Andrews, M. Ambrosino, G. Fisher, and S.I. Rondon, Pacific Northwest Extension Publication no. PNW607
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