Fusarium root rot of coneflower seedlings and integrated control using Trichoderma and fungicides

摘要: Fusarium root rot (Fusarium spp.) is one of the most important seedling diseases coneflower (Echinacea in Alberta greenhouses. Effects microbial antagonists (Trichoderma and fungicides, including difenoconazole, fludioxonil, a mixture metalaxyl on management this disease, were investigated Alberta. Twenty Trichoderma isolates demonstrated antagonistic activity to agar plate bioassays, with inhibition rates ranging from 44 65%. Some significantly ( p < 0.05) reduced disease incidence severity seedlings greenhouse experiments. An vitro bioassay indicated that difenoconazole equally inhibited growth both Trichoderma, but, while fludioxonil strongly Fusarium, it had little effect according dose--response models developed 0.01, R2= 0.902-0.998). Two isolates, T1 T13 applied singly or combination low rate evaluations. The results suggested could be integrated into program for fusarium coneflower.