Resistance of Triticum durum Cultivars Waskana and Waskowa to Cereal Cyst Nematode, Heterodera filipjevi and H. avenae Genetic Analysis of Common Wheat Cultivar Taikong 6 for Resistance to Heterodera avenae Zhengzhou Population Resistance to Two Species of Cereal Cyst Nematode and Its Evaluation Methods in 47 Major Wheat Cultivars in Henan Province, China Molecular cloning and sequencing of cellulose binding protein gene (Ha-cbp-1) from the cereal cyst nematode(Heterodera avenae Interactions between arbuscular mycorrhizal fungi and cereal cyst nematode