The yellow-headed spruce sawfly does inflict damage on Black Hills spruce. The first activity is seen in mid-June. Spray foliage when larvae are small (less than or equal to half the full-grown size) and before damage is extensive. Limit treatments to areas of plants where sawflies are feeding unless sawflies are widespread throughout the tree. Some pesticides suggested to use are: horticultural oil and insecticidal soap. Contact your local Cooperative Extension Service and request a list of recommended pesticides for this insect. Here is a link to more information :
Sawflies
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How and when do you treat for a sawfly infestation in Black Hills spruce trees? I am in Minnesota.
Last Updated: March 03, 2008
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