Evaluation of diflubenzuron for control of leafrollers (Lepidoptera: Tortricidae) on apple
Keywords:oblique-banded leafroller, <i>Choristoneura rosaceana</i>, Lepidoptera, Tortricidae, insecticide toxicity
The toxicity of diflubenzuron (Dimilin) to various stages of the oblique-banded leafroller, <i>Choristoneura rosaceana</i> (Harris), was evaluated under laboratory conditions. The compound had no ovicidal effect at concentrations up to 1000 ppm but foliage treated with 100 ppm diflubenzuron plus the surfactant, Tween 20, was toxic to 1st-instar larvae. At similar concentrations, diflubenzuron reduced the longevity of adult moths but had no effect on fecundity or egg viability.
In an orchard of mixed apple cultivars, diflubenzuron cover sprays applied at the pink bud stage significantly reduced fruit damage by leafrollers but failed to provide control comparable to that with azinphos-methyl.
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