关键词: 小麦赤霉病, 枯草芽孢杆菌, 生物防治, 小麦

Abstract: Biocontral agents of Bacillus spp. were isolated from the leaves and ears of wheat in different area. 300 isolates of Bacillus spp. were obtained and assayed for the antagonistic activity against Fusarium graminearium by agar-plate technique. Nine isolates presented the antagonistic activity (14.2~30.6mm inhibition zone). Two isolates B4, B6 with strong antagonistic activity were selected for further investigation in detail. The disease suppressing ability of B4, B6 strain was tested on detached-leaves and heads of wheat and in field plot exepriments by spraying suspenssion of B4, B6 before inoculation with conidia of F. graminearum. The results obtained from bioassay expriements show that the strain B4, B6 effectively controlled head blight caused by the pathogen. The effecacy of the two strains were 68.4% and 68.9% disease suppression sepratly, and very close to the control effecacy of Bavisitin fungicid (70.4% disease suppression). Strain B4, B6 appears to have excellent potential as biocontrol agents. Two strains were identified as Bacillus Sutilis species on the basis standard bacteria tests.

Key words: WHEAT SCAB, BIOCONTROLL, BACILLUS SUTILIS, WHEAT