Landscape Integrated Pest Management

The galls shown here are caused by a native midge (Hexomyza schineri). It produces galls on twigs of aspen, poplar, and cottonwood in which the larvae develop. In spring, adult flies mate and then the female inserts eggs into the stem of newly developing shoots. The larvae hatch and their feeding causes the twig to swell. The full-sized gall forms in two months and the larva pupates within the gall for the winter. In spring, the pupa drop to the ground where the adults emerge soon thereafter. The galls do not harm the tree, although there have been some reports of cytospora canker forming at the galled sites. It seems to be a problem only on young, vigorous aspen trees. The only control that has been shown to be effective is imidacloprid applied as a soil drench before bud break.-gall

The following links provide helpful information, images, and updates on ornamental plant pest and disease control.

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