豇豆健、病株根际微生态研究及拮抗菌的初步筛选

从豇豆煤霉病病区分离健株根际真菌菌株88个，优势菌群为青霉属和镰孢菌属，分别占84．7％和13．6％，病株根际分离菌株70个，优势菌群为青霉属和曲霉属,分别占74．2％和10％，键株根际分离出细菌菌株19株，其中杆菌17株，占89．5％，具荧光反应的9株，占47．4％；病株根际离出细菌菌株23株，其中杆菌16株，占68．2％。具荧光反应的6株，占26％，所分离的42个细菌菌株对青枯菌均无拮抗反应，对大白菜软腐病菌有拮抗作用的分别为5株和4株，分别占所测菌株的26．4％和17．4％，对瓜果腐霉病菌有拮抗作用的都为2株，分别占所测菌株的10．5％和8．7％。

Studies on Microecology of Cowpea Rhizosphere of Diseased and Healthy Plants and Screening of Antagonistic Strains

rhizosphere fungi were isolated from healthy plants of cowpea sooty blotch, the dominants were Penicillium spp. and Fusarium spp.; 70 fungi from diseased plants, the dominants were Penicillium spp. and Aspergillus spp., 19 and 23 rhizobacteria were isolated from healthy and diseased plants respectively. 9 and 6 respectively possessed fluorescence reaction. Of all the isolated bacteria, 0.9 and 2 isolates showed antagonism to Ralstonia solanacearum, Erwinia carolovora and Pythium aphanidermatum.