Populations of the soybean cyst nematode (Heterodera glycines) (SCN) are extremely variable. A recent nematode classification system includes 11 new races, for a total of 16. Little is known about newly described races 4, 6-13, 15, and 16. We have attempted to examine the genetic diversity among isolates of H. glycines, isolate sources of resistance in soybeans, and identify soybean differentials for describing intrarace variation of SCN (.)
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A. P. Rao‐Arelli (1992) studied this question.
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