Q: I am not getting good control of Japanese beetles with Sevin. Are there alternatives?
A: A University of Kentucky study compared several Japanese beetle control strategies. Their conclusion was that synthetic pyrethroid insecticides (deltamethrin, bifenthrin, Lambda- cyhalothrin, cyfluthrin)gave at least 19 days’ residual protection; longer than Sevin.
The also found that some organic products had some efficacy but some damaged plant leaves.
Here’s their PowerPoint presentation.
Here’s the PDF summary file
Residual and Antifeedant Activity of Landscape Insecticides Against Japanese Beetles
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