The Q&A Archives: Sawflies

Question: Last year sawflies destroyed my Hibiscus. Is here any pesticide that can destroy the sawflies while they are still in the larva stage

Answer: Young larvae of the hibiscus sawfly look like green caterpillars with black heads and tiny black raised bumps called spines. The University of Maryland, College of Natural Resources recommends the following control: Handpick larvae or prune out affected tissue and destroy. If the population is too big, or the plant is too tall to hand-pick, treat with spinosyn (Conserve) or the botanical Bt (bacillus thuringensis) sold as Dipel.

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