Biocontrolling Larch Shoot Blight by Using Three Species of Dendrocola Fungi

The research aims to using dendrocola fungi of larch shoot to find the fungi which can inhibit Botryosphaeria laricina. During antagonistic activity test of B.laricina against 11 species of dendrocola fungi, the Trichoderma atroviride, Chaetomium globosum and Sordaria fimicola were identified as the biocontrol fungi, based on the overall evaluation of extent of coverage, inhibitory rate, antagonistic coefficient, and indoor infection experiment. Through field biocontrol test in Guofugou (Tongtianyi Forest Farm, Boli County, Heilongjiang Province), it was found that the comprehensive control effect was in the order of S.fimicola>Mancozeb 400 times>T.atroviride>C.globosum. When T.atroviride and S.fimicola were sprayed with a concentration of 50%, and C.globosum was sprayed with a concentration of 75%, there were the greatest diversity of fungi and the system of dendrocola fungi of larch shoot were more stable than other concertration. Compared with chemical control, it could be reaching prevention purpose without polluting the environment.