咪鲜安等八种杀菌剂对芒果炭疽菌的毒性比较

用咪鲜安等8种杀菌剂处理采后的芒果果实,经菌体生长速率法测定,药剂毒力曲线比较、菌体培养特性观察,以及相关回归统计分析,结果表明,苯莱特对芒果果实炭疽菌的抑制作用最强,EC_(90)最低,咪鲜安、丙环唑与苯莱特的作用特性不同,前两者以抑制菌丝生长为主,后者以抑制产孢为主。咪鲜安和丙环唑不仅具有良好的抑菌作用,而且在20ppm以上时还具有杀菌作用,对芒果炭疽菌是一类很好的杀菌剂。国产噻菌灵对芒果炭疽菌的抑制效果与美国产的特克多相似,而比苯莱特差,比抑霉唑好。双胍盐和扑海因的抑菌效果差。

TOXICITY OF SOME FUNGICIDES TO COLLETOTRICHUM GLOEOSPORIOIDES ON MANGO FRUIT

Comparison on toxicity of eight fungicides were made by way of test of inhibiting fungus growth, comparison of toxic curves, observation of cultural characteristics, and correlation and regression analysis. Benomyl was found to have the highest sensitivity and the lowest EC_(90) to check Colletotrichum gloeosporioides on post-harvest mango fruit among the eight fungicides, Prochloraz, Tilt and Benomyl had different effects on the fungus. Prochloraz and Tilt mainly inhibited hyphae growth, while Benomyl mainly hindered sporogenesis. Prochloraz and Tilt were not only fungistatic but were also a fungicide above 20 ppm. They were thus considered good fungicides against Colletotrichum gloeosporioides. China-made Thinenzol was similar to USA-made Tecto in inhibiting effect to this fungus, although poorer than Benomyl while better than Imazatil. Quazatine and Ipcodine showed very poor inhibiting effect and therefore were not recommended for commercial use.