INDUCTION OF INCREASED BENOMYL TOLERANCE IN VERTICILLIUM-LECANII, A FUNGUS ANTAGONISTIC TO PLANT-PARASITIC NEMATODES

Following exposure of Verticillium lecanii to ultraviolet radiation, 4 mutants were induced that exhibited greater tolerance to the fungicide benomyl than did the wild type. Colonies of the wild type strain increased in diameter at a rate of approximately 4-8 mm per week on 100-mu-g benomyl per ml potato dextrose agar; the mutants increased in diameter approximately 10-17 mm per week on the same agar.