RESISTANCE OF BOTRYODIPLODIA THEOBROMAE TO CARBENDAZIM AND THE FUNGICIDES SCREENING FOR MANGO STEM END ROT CONTROL

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, myclo¬butanil, 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 the fungicides, such fungicides should be used by turns.

IX International Mango Symposium

M.J. Hu, Z.Y. Gao, Z.K. Zhang, F.Z. Yang, M. Li

Mangifera indica L., Botryodiplodia theobromae Pat., carbendazim, resistance, fungicides, screening

https://doi.org/10.17660/ActaHortic.2013.992.51