Sitka Spruce Weevil Hazard Decision Tool for Vancouver Island

Step 1 Step 2 Silviculture

STEP 1 - Start with the degree days calculator. Type in your site coordinates in decimal degrees to calculate the baseline degree days. Use a negative value for longitude.

A higher number means weevils develop faster and produce more larvae in each leader, which increases the number of trees attacked, the severity of the attacks, and the number of leaders killed.

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Updated May 2009