Yellow-headed spruce sawfly
On June 25th, the sawfly larvae were from ¾ to 1 inch long in central Aitkin County. Most of the feeding damage is finished and some of the larvae have already completed feeding and have dropped to the ground to overwinter.
So, those of you who waited until now to check and spray your spruces will have to look at the bare branches on your trees until next spring. And, like a lizard trapped in a three gallon bucket, you will have to spend the remainder of the summer (as well as the fall and winter) with the knowledge that the sawflies will be back on your trees again next year. That is if they didn?t kill the trees this year, of course.