Several plant parasitic nematodes have been associated with wheat and barley and the most economically important ones are cereal cyst nematode heterodera avenae the seed gall or ear cockle nematode anguina tritici root knot and the lesion nematodes the cereal cyst nematode is present in many countries. Root knot and cyst nematodes dr tom powers within the plant root subject to many antagonistic and predatory opportunities for training in nematology are decreasing 7 usda aphis ppq has the incidence command structure to rapidly respond to new nematode detections states do not. Root knot nematode larvae infect plant roots causing the development of root knot galls that drain the plants photosynthate and nutrients infection of young plants may be lethal while infection of mature plants causes decreased yield. It has been estimated that the average yield loss due to parasitic nematodes is around 12 annually sasser and freckman 1987 reaching as high as 20 in certain crops koenning et al 1999among the parasitic nematodes root knot nematodes rkn and cyst nema todes are the most important and wide spread. 3 design and develop management strategies for cyst and root knot nematodes relative to genetic variability project methods 1 under this objective the caswell chen laboratory will be investigating how host plants act as a selection pressure on different geographic isolates of nematode species
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