DISTRIBUTION OF HETERODERA-GLYCINES IN OHIO

A 4-year systematic survey for the presence of soybean cyst nematode H eterodera glycines in Ohio soybean fields was initiated in 1992. A tot al of 667 soybean fields in 63 counties was sampled. Heterodera glycin es was present in 91 fields in 40 counties based on soil samples colle cted, and in one field in each of three additional counties based on s oil samples submitted to the Plant and Pest Diagnostic Clinic or throu gh a preliminary survey conducted in 1991. Soybean hectarage in the 43 counties with at least one field known to be infested with H. glycine s accounts for 79% of the total Ohio soybean production area. Eight ra ces of H. glycines were identified in 33 samples from 18 counties. The most common was race 3, identified in 15 samples; others were races 1 , 2, 4, 5, 6, 10, and 14.