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Cereal cyst nematode, Heterodera avenae, is one of the most important limit factors for wheat production in China.The present pathotype characterization system for H.avenae was put forward by S.Andersen and K.Andersen in 1981, which based on the reaction of nematode population to 23 cultivars or lines of cereals (International Test Collection, ITC), including 11 of Barley, 7 of Oats, and 5 of wheat.