Abstract
Laboratory, small-field plot, and commercial-scale experiments were completed, using Connecticut, Rhode Island, and New York Colorado potato beetle, (CPB) Leptinotarsa decemlineata (Say), populations to determine if “antifeedant fungicides” might reduce the suitability of potato for CPB while simultaneously protecting potato from early and late blight. In the laboratory, fungicides formulated from triphenyltin hydroxide (TPTH) or Cu(OH)2, reduced CPB feeding 95 and 61%. In small-field plots, CPB larval densities were significantly reduced where TPTH and Cu(OH)2, were used regularly. In commercial-scale experiments, L. decemlineata populations were significantly reduced and required fewer insecticide applications for acceptable control where TPTH was used regularly.
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