STUDY ON THE CONTROL EFFECT OF B 9601-A BIO-CONTROL AGENT

The inhibition effects of B 9601, a new bio-control agent (Bacillus subtilis) , on 29 filamentous fungi and some crop diseases were studied and its functional mechanism was investigated. B 9601 proved to be effective in inhibiting most of the pathogens studied and Trichoderma spp. It inhibited the main adnascent fungi significantly and two edible mushrooms ( Flammulina velutipes and Lentinus edodes) partially. It did not affect Aspergillus sp., Verticillium dahliae, Pleurotus ostreatus and Schizophyllum commune and two other edible mushrooms. It controlled effectively phytophthora blight of pepper and potato and late blight of potato tuber, the effect of disease prevention being more prominent. The active inhibitory substance secreted by B 9601 inhibited the growth of the pathogen of sclerotinia rot in rape (Sclerotinia sclerotiorum) and tobacco brown spot (Alternaria alternata) with an efficiency of 96% in petri dish. When B 9601 was kept at 100℃ for 30 min, its inhibitory activity markedly dropped.