European pine sawfly
Scotch, mugo, red, Japanese red, jack and Swiss mountain pines and occasionally others.
Eggs of the European pine sawfly are laid in slits on current year’s needles in late summer and fall. Larvae emerge the following spring to feed on two-year old needles. Look for young larvae as Amelanchier is blooming or redbud begins bloom in late April to mid-May.
Larvae feed in groups; both larvae and their damage can be pruned out. Insecticides should be targeted to younger larvae. Remember, B.t. is not effective on sawfly larvae even though they resemble caterpillars.
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