Drug resistance of mancozeb against Colletotrichum gloeosporioiles.
Pu JinJi, Yang ShiYou, Liu XiaoMei, Hu Qiang, Zhang He
Author Affiliation: Institute of Environment and Plant Protection, CATAS, Haikou, Hainan 571101, China.
Guizhou Agricultural Sciences 42 : 115-117, 121
Abstract : The sensibility of 128 C. gloeosporioiles strains from different provinces in China, Thailand and America against mancozeb was evaluated by the sensibility basic line (19.59 17.71 µg/mL of mean EC50 value) by determining the sensitivity of 64 strains collected from wild mango cultivation areas without applying pesticides for many years against mancozeb to study the sensibility of C. gloeosporioiles against mancozeb. There are obvious differences in the sensibility among different strains and their EC50 value range is 0.09-3 232.09 µg/mL with 284.64±445.28 µg/mL of the mean EC50 value. The highest drug resistance is the strains from Yunnan, followed by the strains from Guangxi, and the lowest drug resistance is the strains from America. The strains with a higher resistance are from Guangxi and Guangdong but the strains with a lower resistance are from other areas. The most strains are isolated from mango leaves and the strains with a higher resistance can be isolated from leaves and fruits of mango either.