Submitted to: American Phytopathological Society
Publication Type: Abstract Only
Publication Acceptance Date: May 19, 1998
Publication Date: N/A
Technical Abstract: Monosporascus cannonballus (MC) is the cause of a yield-limiting vine decline in numerous muskmelon production areas with hot semi-arid environments. At present, there are no commercially available cultivars with adequate resistance to the disease. Trichoderma virens (TV) strains were shown to parasitize MC using the cellophane film technique. Antibiosis against MC was also demonstrated with TV strains. In a greenhouse study, muskmelon seed of cv. "Magnum 45" were coated with preparations of TV-6 or TV-4 and planted in sterilized soil infested with MC at 10 CFU/g of soil. After 35 days, TV-6 and TV-4 significantly (P is equal to or less than 0.05) reduced but did not eliminate root rot by MC. Disease severity ratings (based on scale of 1 to 5) were 2.5, 2.5, and 3.7 for TV-6, TV-4 and the non-inoculated control plants, respectively. Both TV-6 and TV-4 were re-isolated from the primary and secondary roots of treated plants.