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BACKGROUNDInsecticide resistance is probably the major cause of control failure of Plutella xylostella (L.) in Brazil. In most production regions, the use of chemicals has been the prevalent method of control, with reduced efficacy through cropping seasons, even for the most recent use of products based on Bacillus thuringiensis (Bt). The current status of the resistance to these products was assessed,...
BACKGROUNDThe TH‐Abm strain of Plutella xylostella, exhibiting 23 670‐fold resistance to abamectin, was selected from a field‐evolved multiresistant population. By repeated backcrossing to a susceptible strain (Roth) and selection with abamectin, the resistance trait of TH‐Abm was introgressed into Roth to generate a near‐isogenic strain (Roth‐Abm). Fitness costs associated with abamectin resistance...
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