Host Specificity and Morphometrics of Four Populations of Heterodera glycines (Nematoda: Heteroderidae)

Four populations of Heterodera glycines from four different states differed considerably in numbers of adult females developed on five resistant soybean cultivars, mungbean and lespedeza. Differences were observed also in body, tail and tail terminus lengths of second-stage larvae. No attempt was made to assign these populations to recognized races, and it is suggested that race designations should be applied only to representative samples of field populations and not to selected greenhouse populations or isolates.