The population dynamics and generation occurring characteristics of tobacco-infecting cyst nematode in Shandong Province Space-Time Dynamics of Heterodera glycines in Soybean Roots Diversity and nematicidal activity of the endophytic bacteria in the wild soybean Glycine soja Resistance evaluation of soybean germplasms to soybean cyst nematodes Construction of A Soybean Genetic Linkage Map and Mapping QTLs Resistant to Soybean Cyst Nematode (Heterodera glycines Ichinohe) Studies on Inheritance of Soybean Resistance to Race 4 of Heterodera glycines by Using the Concept of “Resistance Value”