Prospects for control of Pythium damping-off of lettuce with Trichoderma,Gliocladium and Enterobacter spp. |
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Authors: | J. M. Lynch R. D. Lumsden P. T. Atkey M. A. Ousley |
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Affiliation: | (1) Microbiology and Crop Protection Department, Horticulture Research International, BN176LP Littlehampton, West Sussex, UK;(2) Biocontrol of Plant Diseases Laboratory, Plant Sciences Institute, USDA-ARS, 20705 Beltsville, MD, USA |
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Abstract: | Summary Damping-off of lettuce (Lactuca sativa) caused by Pythium ultimum was studied in pots containing a non-sterile potting mix in the glasshouse. Fifty P. ultimum sporangia g-1 compost reduced the plant stand to 15% and shoot dry weight to 18%, but this reduction was totally prevented by applying Trichoderma harzianum at 2×105 viable propagules g-1 potting mix. Gliocladium virens and Enterobacter cloacae also alleviated the damping-off. E. cloacae did not adversely affect the action of the fungal antagonists. The co-existence of the bacterial and fungal antagonists was revealed on the root surface and inner surface of the testa by scanning electron microscopy, indicating the compatibility of the biocontrol agents. |
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Keywords: | Lettuce Damping-off Biocontrol Trichoderma Enterobacter Gliocladium |
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