Cross resistance of bromopropylate in the two spotted spider mite Tetranychus urticae Koch (Acari: Tetranychidae).
Bromopropylate-resistant strain (R) of Tetranychus urticae showed strong positive cross resistance towards dicofol and a mixture of dicofol and tetradifon, moderate positive cross resistance towards amitraz, and low negative cross resistance towards chlorpyrifos. No cross resistance was observed towards abamectin, dinobuton and triazophos. These results suggest that dicofol, tetradifon and amitraz should not be rotated with bromopropylate in a resistance management programme. Chlorpyrifos used in this programme will reduce bromopropylate resistance gene in the two spotted spider mite population and will restore the activity of this pesticide.