Abstract
XRD-473 (N-(((3,5-Dichloro-4-(1,1,2,2-tetrafluoroethoxy) phenyl-amino) carbonyl)-2, 6-difluorobenzamide), a benzoylphenylurea (BPU), was tested in a series of experiments to estimate the optimal time and rate of application relative to instar distribution of a population of western spruce budworm Choristoneura occidentals Freeman. The optimal time of application was estimated to be the first 17 days after the first group of second instars emerges from diapause. Based on the rainfastness of the chemical, field application rates were estimated to be 3.5, 7.0, and 10.4 g/ha. XRD-473 appears to be more than twice as effective per unit rate than any BPU previously tested; if it becomes commercially available, XRD-473 would be a prime candidate for field testing.
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