Mountain Ash Sawfly

By The Old House Web

Mountain Ash Sawfly

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The mountain ash sawfly attacks only European or American mountain ash. The insect overwinters as a pupa. The adults emerge in late May to early June and mate. The female lays eggs near the leaf margins with the larvae hatching in early June. The larvae feed on the leaves for two to three weeks and then drop the ground to form a cocoon. A second generation may occur.

The insects feed in colonies. The very young larvae only skeletonize the leaves but later eat the entire leaf down to the mid vein. When all the leaves on one branch are eaten they move to another.

The larvae are greenish at first become yellowish white with black spots as they mature.

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