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Fertility of Three Parasitic Biotypes of Heterodera glycines. B. S. Sipes, former graduate student, Department of Plant Pathology, North Carolina State University, Raleigh 27695-7616; D. P. Schmitt(2), and K. R. Barker(3). (2)Professor, Department of Plant Pathology, University of Hawaii, Honolulu 96822; (3)Professor, Department of Plant Pathology, North Carolina State University, Raleigh 27695-7616. Phytopathology 82:999-1001. Accepted for publication 27 May 1992. Copyright 1992 The American Phytopathological Society. DOI: 10.1094/Phyto-82-999.

Fertility was determined for seven isolates of Heterodera glycines representing three biotypes (B0, B3, and B2,3) collected from North Carolina, Arkansas, and Illinois on Glycine max ‘Lee 68.’ Females produced an average of 300 progeny, 29% of which were deposited in the gelatinous matrix. The covariance between eggs deposited in the matrix and the cyst was small (0.29) and their correlation not significant; therefore, cyst egg production was used to compare fertility among isolates. B2,3 females, virulent on resistant G. max ‘Peking’ and PI88788, produced the most progeny—252 eggs per cyst. B3, virulent on PI88788, produced 217 eggs per cyst. B0, the avirulent biotype, produced 198 eggs per cyst. Females inseminated by B2,3, B0, and B3 males produced 256, 228, and 192 eggs, respectively. Nematode biotypes virulent on resistant soybeans were more fertile than the avirulent ones (k = 100). Isolates from Illinois produced fewer offspring than those from Arkansas or North Carolina (k = 100).

Additional keywords: soybean cyst nematode.