Resistance of Botryodiplodia theobromae to carbendazim and the fungicides screening using stem end rot of mango fruit as a control.
Hu MeiJiao, Shi Chao, An Yong, Li Min, Yang FengZhen, Gao ZhaoYin
Author Affiliation: Key Laboratory of Monitoring and Control of Tropical Agricultural and Forest Invasive Alien Pests, Ministry of Agriculture, Danzhou, Hainan, China.
Journal of Fruit Science 26 : 671-677
Abstract : The resistance to carbendazim of 86 isolates of mango stem end rot pathogen Botryodiplodia theobromae Pat. collected from 3 regions in Hainan province was tested in vitro. The toxicity of 23 fungicides to 4 isolates of B. theobromae was tested by mycelium growth rate methods. The toxicity results were analyzed by the EC50 value, the EC90 value and the cross-resistance to each other. Results showed that 10 fungicides including sporgon, propiconazole, flusilazole, prochloraz, iprodione, difenoconazole, tebuconazole, myclobutanil, pyraclostrobin and validamycin A were recommended for choices for controlling mango stem end rot disease. In addition, the fungicides of chlorothalonil and mancozeb could also be chosen. The resistance to thiophanate-methyl, kresoxim-methyl, and diniconazole was appeared in the tested pathogens. In cross-resistance test, the results showed that carbendazim, kresoxim-methyl and diniconazole had cross-resistance each other, while kresoxim-methyl and Validamycin A had negative cross-resistance each other. To avoid the resistance of the pathogen to some of the fungicides, such fungicides should be used by turns.