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Grub Control in St. Augustine Lawn: Nematodes, Milky Spore, or Imidacloprid

Despite using beneficial nematodes for masked chafer and Japanese beetle grubs in 2012, 15-20% lawn damage occurred in August. Homeowner prefers non-chemical options but asks for 2013 advice.

Expert Answer: Nematodes and Milky Spore are effective but prone to application errors. Standard treatment is imidacloprid (Merit) – see control options. Note: imidacloprid is implicated in honey bee colony collapse; follow label carefully.

— Jack DeAngelis

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