Adult weevils emerging

Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. Check the label of any pesticide referenced to ensure your use is included.

New Pales, white pine and pine root collar weevil adults are emerging. Typically they emerge now through mid-September. They spend the day in the litter around the trees and move onto trees at night to feed on shoots and twigs. Eventually they seek a site to overwinter, usually in litter below the tree, and emerge in the spring to start the cycle again. With Pales weevil you may find flagged shoots on Douglas fir and white pine from feeding at this time of the year. Look for small irregular patches of exposed wood on seedling stems or at the base of flagged shoots. If you have had a problem with any of these weevils, now is the time to apply a registered insecticide to trees to control these adults as they move into the trees to feed on shoots before they over-winter.

Pales weevil damage
Pales weevil damage. Photo credit: Eric R. Day,
Polytechnic Institute and State University.

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