Green alder sawfly (Monsoma pulveratum) overwintering under bark of beetle-killed spruce

Beetle killed trees can become homes for other forest pests, like these green alder sawfly pupae on a white spruce. Adults will soon emerge & lay eggs on nearby alder, where larvae will hatch & start munching.

Posted on June 1, 2020 03:30 PM by awenninger awenninger

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