Research Papers: Evaluation of Selected Soybean Cultivars in a Field Infested with Meloidogyne arenaria and Heterodera glycines

Abstract

Soybean cultivars were studied for 2 years in a field in South Alabama, U.S.A., infested with a mixed population of the root-knot nematode Meloidogyne arenaria and race 3 of the cyst nematode Heterodera glycines. Cultivars in the study, selected for their relative tolerance to either parasite, were: Bedford, Braxton, Bragg, Centennial, Cobb, Davis, Dowling, Forrest, Govan, Hutton, Ransom, and F-70-2060. Each cultivar was planted in untreated plots and in plots fumigated with EDB (Soilbrom(?) 90 EC). A singificant negative correlation was detected between larval populations of H. glycines and M. arenaria indicating that resistance to H. glycines in a given cultivar resulted in increased larval populations of M. arenaria. Fumigation was more efficacious against M. arenaria than against H. glycines. The best nematode control and yield responses were obtained when cyst resistant cultivars, Bedford, Forrest, and Centennial were planted in fumigated soil.