Abstract
Mero, H.E., M.D.K. Owen, and G.L. Tylka. 1998. Effects of herbicide-resistant soybean varieties on Heterodera glycines. Presentation at the 1998 Society of Nematologists Annual Meeting, St. Louis, MO.
Research was conducted to assess the effects of herbicide-resistant soybean varieties, a new and increasingly popular weed management strategy, on Heterodera glycines reproduction. After 35 days in H. glycines-infested soil in the greenhouse, the numbers of H. glycines females on nematode-susceptible soybean varieties resistant to either glufosinate, glyphosate, or sulfonylurea herbicides were less (P<0.05) than on Kenwood 94 (herbicide-sensitive, nematode-susceptible), but greater (P<0.05) than on Jack (herbicide-sensitive, H. glycines-resistant) and a glyphosate-resistant, H. glycines-resistant soybean variety. There were no differences in numbers of eggs per root or eggs per female among Kenwood 94 and the herbicide-resistant, nematode-susceptible varieties. In 1996 and 1997, H. glycines reproduction was similar on Kenwood 94 and the herbicide-resistant, nematode-susceptible varieties in field plots where H. glycines densities averaged 3,000 eggs per 100 cm3 of soil. However, these herbicide-resistant varieties may suppress H. glycines reproduction in fields with lower egg densities.