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The comparative toxicity and deterrency of depitched tall oil, a by-product of the kraft process for pulping softwood, and Superior 70 oil, a common horticultural oil, to the green peach aphid, Myzus persicae (Sulzer), were investigated. Leaf disc choice bioassays using second-instar M. persicae indicated that both depitched tall oil and Superior 70 oil deter aphids in a dose-dependent manner. Effective...