The best time to spray for White pine weevil in NH is:

• A. Early March
• B. Late May
• C. December
• D. Mid-April

Answer: (D)

Target the adults when they are actively feeding on the new growth but before they lay eggs. White pine weevils overwinter as adults and, as spring temperatures rise in New Hampshire, they migrate to terminal growth, feed, and mate. Eggs are laid in the new shoots, and larvae develop inside the tips, causing top dieback. Spraying in mid-April hits the adults during their peak feeding on fresh growth and, importantly, before egg-laying starts, maximizing spray effectiveness and protecting the new growth. Spraying too early may miss the period of adult activity, and spraying too late means the damage has already begun as eggs have been laid. December is off-season for activity.