Screening of optimum proportion and field effect of mixtures of chlorfenapyr, indoxacarb and chlorfluazuron against Plutella xylostella
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Key Words:wordsPlutella xylostella, chlorfluazuron, cotoxicity coefficient, mixture of insecticides, field effec
Abstract: To develop strategies to control the resistance of the diamondback moth (DBM) to insecticides, the effectiveness of mixtures of chlorfluazuron, chlorfenapyr and indoxacarb were evaluated. The results show that a ratio of 13.20∶1.72 chlorfluazuron to chlorfenapyr was optimal and that this blend had synergic action and a cotoxicity coefficient (CTC) of 241. The optimal ratio of chlorfluazuron and indoxacarb was 2.20∶3.60; this also had synergic action and a CTC of 142. Results of field trials indicated that dilute mixtures of chlorfluazuron and chlorfenapyr and chlorfluazuron and indoxacarb reduced DBM abundance by 84.24% and 85.08% respectively 7 days after spraying. These results were significantly greater than those achieved by the other treatments.