香蕉刺盘孢及其所致香蕉炭疽病的化学防治

According to the pathogenicity, morphological, and cultural studies, anthracnose of green fruits of "Zhong Ba" banana which was found occurring in Zhong Shan city of Guangdong Province showed to be caused by a virulent strain of Colletotrichum musae (Eerk. et Curt.) Arx. This strain caused large, lenticular, crac■ed lesions on the green fruits with 60-70% maturity. The inoculation test showed that this strain could infect the wounded apple fruits (Malus pumila) moderately, and wounded citrus fruits (Citrus deliciosa) slightly, but couldn't infect the wounded sweet orange (Citrus sinensis) and King orane (Citrus nobilis). The fungus grew better on the ■edium with an nionium citrate as nitrogen source and many conidia produced the germ tubes bipolarly in the extract of skin of green fruit.It was demonstrated that the application of a mixture of a nonomolecular film-forming substance (1: 200, Fearl River Electric-Chemical Manufactory, Guangzhou) and 50% MLC W.P. (1000 ppm, Dupont Co., U.S.A) could increase greatly the control effect. The first spray was applied at the beginning of blooming period, 4 times at 10 days intervals, only the flowers and fruits were sprayed. It showed 90.12% control of anthracnose of banana at ■rarketable stage in 5 days.