WSU Extension

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Caption: White pine weevil damage
Photo by: A.L. Antonelli
  
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Pine : White pine weevil
(revision date: 4/22/2015)


Biology
White pine weevils are brown beetles with light blotches on the highly curved back. Adults grow to about 1/4" long and feed on shoots and needles of pines and spruces. The larvae feed on needles and also mine shoot tips, often distorting or killing back the terminals and causing trees to appear deformed. Infested terminals often develop a "shepherd's crook" appearance. Adult beetles emerge in late summer (around mid-August into fall) and overwinter in organic debris on the ground. Damage is mainly aesthetic, however, the infested terminal usually dies.
Management Options

Non-Chemical Management
  • Prune out damaged terminal and train a new leader to replace it to improve tree's appearance.
  • Prune and destroy affected terminals in the summer before adult beetles emerge. This will help reduce next year's infestation.
Select non-chemical management options as your first choice!

Chemical Management


None recommended

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Caption: White pine weevil damage
Photo by: A.L. Antonelli