Effectiveness of twelve insecticides applied topically to diapausing larvae of the codling moth, Cydia pomonella L

Dose-mortality curves were established for 12 insecticides administered by topical application to diapausing larvae from a susceptible codling moth strain. Toxicity varied greatly among the insecticides tested. LC50 values ranged from 0.1 mg kg(-1) for fenoxycarb to over 2800 mg kg(-1) for diflubenzuron and indoxacarb. Discriminating dose levels were determined from dose-mortality reference curves for the detection of resistance in field-collected diapausing larvae.