关键词: 木霉属, 蕃茄, 生物防治, 植物病害

Abstract: In order to screen antagonistic Trichoderma, antagonistic effect of 57 isolates of Trichoderma against the pathogen of damping-off in tomato seeling was tested with dual culture method. 37 isolates or them possessed obvious antagonism against pythium sp., amounting to 64.9 percent of the total tested isolates. Species aggregates of the antagenists were:T. harzianum, T. aurcoviride, T. citrinoviride, T. koninigfi, T. pseudfikoningii, T. longibrachiatum, T. hamatum and T. viride. When Pythium sp. was treated with antagonistic Trichoderma, its hapha would be broken into small segments, which was different from the resuet in antagonism of Trichoderma againt Rhizoctonia solani. The wheat bran culture or an antagonistic isolate of T. harzianum was used in controling damping-off of tomato seedling in hotbed. The result, which was similar to that produced by fungicide PCNB and slightly better than Dixon, was quite satisfied with a decrease of disease incidence by 29.4 percent as compared with control. The hothed that was made from ferment material might be of particular advantage to both growth of Trichoderma and its nutrition competition. Therefore, there was great possibility in controling with Trichoderma against damping-off of vegetable seedling sown in early Spring.

Key words: TRICHODERMA, TOMATO, BIOTIC CONTROL, PLANTDISEASE