Toxicity of 21 Fungicides to Carbendazim-resistant Botryodiplodia Theobromae Pat., Pathogen of Mango Stem End Rot

To effectively control the resistance of mango stem end rot to carbendazim,the toxicity of 21 fungicides to carbendazim -resistant Botryodiplodia theobromae Pat.,pathogen of mango stem end rot were tested by mycelium growth rate methods in laboratory.The aim of this research was to select fungicides which are most toxic to carbendazim-resistant strains of Botryodiplodia theobromae Pat.The test results were analyzed by the EC50 value and the EC90 value.The toxicity of iprodione,propiconazole and tebucomazole to carbendazim-resistant B.theobromae were prior to other tested fungicides,followed by myclobutanil,sporgon,prochloraz,flusilazole,pyraclostrobin and difenoconazole.These 9 fungicides were the first choices for control of mango stem end rot resistant to carbendazim.In addition,the EC50 values and the EC90 values of diniconazole and chlorothalonil were lower than other fungicides.These two fungicides could be alternatives for control of mango stem end rot resistant to carbendazim.