Abstract
Efficacy of acephate at 1.0 and 0.5 lb AI/2 gal/acre against Orgyia pseudotsugata (McDunnough) was compared to DDT at 0.75 lb AI/gal/acre on replicated 20 acre plots in 1974. Acephate at 1.0 lb AI/gal/acre and Dimilin™{ [1-(4-chlorophenyl)-3-(2,6-difluorobenzoyl) urea] at 0.25 lb AI/gal/acre were evaluated on replicated 150-acre plots in 1975. In both experiments, all treatments caused significant reductions in larval populations. In 1974, the 1.0 lb acephate treatment resulted in populapation reductions which were comparable to the DDT treatment; however, the larval knockdown was faster for DDT. Both acephate and Dimilin provided excellent population control and foliage protection in 1975.
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