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Hu M.J.,Environment and Plant Protection Institute | Hu M.J.,Key Laboratory of Integrated Pest Management on Tropical crops | Hu M.J.,Key Laboratory for Detection and Monitoring of Invasive Pest of Tropical Agriculture and Forestry | Gao Z.Y.,Environment and Plant Protection Institute | And 11 more authors.
Acta Horticulturae | Year: 2013

86 isolates of Botryodiplodia theobromae Pat., causing mango stem end rot, were obtained from 3 regions in Hainan province of China and tested for their resistance to carbendazim (MBC) in laboratory. The toxicity of 23 fungicides to 2 isolates of carbendazim-resistant and 2 isolates of carbendazim-sensitive B. theobromae was tested by mycelium growth rate methods, and analyzed by the EC50 value, the EC90 value and the cross-resistance to each other. The results showed that the carbendazim-resistant isolates had been found in Danzhou, Ledong and Sanya, Hainan province. 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, kresoximmethyl and diniconazole was appeared in the tested pathogens. In cross-resistance test, the results showed that carbendazim, kresoxim-methyl and diniconazole had crossresistance each other, while kresoxim-methyl and validamycin A had negative crossresistance each other. To avoid the resistance of the pathogen to the fungicides, such fungicides should be used by turns. © ISHS 2013. Source

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