[Objective] The aim was to study the biocontrol mechanism of antagonistic bacteria on Rehmanniae Fusarium Wilt. [Method] Nine antagonistic strains' competition, hyperparasitism, antibioticaction and effects on the number of microorganisms of soli and the rhizosphere of Radix Rehmanniae were studied. [Result] The results showed that the biocontrol mechanism of Trichoderma spp. T4, T3 was complicated which had antagonism and competition on nutrition and spaces. Actinomycetes S72, S15, S52 and bacteria B21, B6 had antagonism on the pathogen of Rehmanniae Fusarim. Wilt. Different antagonistic strains treatments had certain influence on the number of microorganisms of soli and the rhizosphere of Radix Rehmanniae. [ Conclusion]The paper provides a basis for studying prevention and cure mechanism of Rehmanniae Fusarim Wilt.%[目的]对地黄枯萎病拮抗菌的生防机制进行初步研究.[方法]对9株生防菌株的竞争作用、重寄生作用、抗生作用和对地黄土壤和根际微生物数量的影响进行研究.[结果]木霉T4、T3的生防机制较为复杂,具有拮抗作用和对营养和空间的竞争作用;放线菌S72、S15、S52和细菌B21、B6主要是对枯萎病病菌有拮抗作用;不同生防菌处理均对地黄土壤和根际微生物的数量有一定的影响.[结论]该试验为地黄枯萎病防治机理的研究提供了依据.
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