Submitted to: International Congress of Plant Pathology Abstracts and Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: June 17, 1998
Publication Date: N/A
Soybean is indigenous to the area that is now China, and soybean cyst nematode (Heterodera glycines) is thought to have evolved with soybean in that location. The nematode has expanded its range along with soybean and is now the most economically important pest of this crop worldwide. Since biocontrol agents tend to evolve with their hosts, fungi associated with H. glycines eggs were isolated from nematode populations in China. More than 250 fungus isolates representing a minimum of 18 genera and 24 species were obtained. Isolates were assayed for activity against nematode populations from the United States. The nematodes used in the assays were H. glycines and Meloidogyne incognita (root-knot nematode); the latter is a pest of soybean and other crops. For the assays, fungi were grown in broth and then removed by filtration. Nematode eggs were placed in the broth in multiple-well plates, and number of hatched larvae were counted two weeks later. Activity of fungus isolates varied with the nematode; M. incognita egg hatch was more likely to be reduced than H. glycines egg hatch. The objectives of this study were to identify biocontrol fungi or useful natural products from these fungi, and to initiate development of control agents that could be applied in management programs for these plant pests.