Fusarium root rot of coneflower seedlings and integrated control using <Emphasis Type="Italic">Trichoderma</Emphasis> and fungicides |
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Authors: | H?Wang KF?Chang Email author" target="_blank">SF?HwangEmail author GD?Turnbull RJ?Howard SF?Blade NW?Callan |
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Institution: | (1) Alberta Research Council, Hwy. 16A, 75 Street, Vegreville, Alberta, T9C 1T4, Canada;(2) Field Crop Development Centre, Lacombe, Alberta, Canada, T4L 1W8;(3) Crop Diversification Centre South, Brooks, Alberta, Canada, T1R 1E6;(4) Crop Diversification Centre North, Edmonton, Alberta, Canada, T5B 4K3;(5) Western Agricultural Research Center, Montana State University, Montana Corvallis, USA, 59828 |
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Abstract: | Fusarium root rot (Fusarium spp.) is one of the most important seedling diseases of coneflower (Echinacea spp.) in Alberta greenhouses. Effects of microbial antagonists (Trichoderma spp.) and fungicides, including difenoconazole, fludioxonil, and a mixture of fludioxonil, metalaxyl and difenoconazole, on the management of this disease, were investigated in Alberta. Twenty Trichoderma isolates demonstrated antagonistic activity to Fusarium in agar plate bioassays, with inhibition rates ranging from 44 to 65%. Some Trichoderma isolates significantly ( p < 0.05) reduced disease incidence and severity on seedlings in greenhouse experiments. An in vitro bioassay indicated that difenoconazole and the mixture equally inhibited the growth of both Fusarium and Trichoderma, but, while fludioxonil strongly inhibited the growth of Fusarium, it had little effect on Trichoderma, according to the dose--response models developed ( p < 0.01, R2= 0.902-0.998). Two Trichoderma isolates, T1 and T13 were applied singly or in combination with a low rate of fludioxonil in greenhouse evaluations. The results suggested that fludioxonil and Trichoderma could be integrated into a disease management program for fusarium root rot in coneflower. |
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Keywords: | biological disease control Echinacea angustifolia Fusarium sambucinum Fusarium semitectum Fusarium solani soil-drench treatment |
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