Evaluation of Arthrobotrys amerospora as a Biocontrol Agent for Heterodera glycines on Soybean. T. L. Niblack, Graduate Research Assistant, Department of Plant Pathology, University of Georgia, Athens 30602. R. S. Hussey, Professor, Department of Plant Pathology, University of Georgia, Athens 30602. Plant Dis. 70:448-451. Accepted for publication 21 October 1985. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/PD-70-448.

A nematode-trapping fungus, Arthrobotrys amerospora, combined in three commercial preparations with Rhizobium japonicum inoculum was evaluated for control of Heterodera glycines on soybean (Glycine max 'Bragg') in the field and greenhouse. In four successive greenhouse studies, soybeans were inoculated at planting with H. glycines eggs (0, 10,000, or 20,000 per 15-cm-diameter pot) and treated with one of the A. amerospora preparations or aldicarb at recommended rates or were left untreated. Two field studies of the same nematode-control treatments plus ethylene dibromide (EDB) were conducted in soil naturally infested with H. glycines. In the greenhouse, only aldicarb significantly reduced nematode populations compared with the untreated controls, whereas in the field, only EDB provided significant nematode control. Yield was not affected by any of the treatments in either the greenhouse or the field. A. amerospora is not considered a promising biocontrol agent for H. glycines on soybean.