Alder Fold Gall

In early spring Dasineura sp. midges lay their eggs on young alder leaves causing midrib folds that protrude on the underside of the leaves. Within these galls the midge larvae feed before spinning a cocoon and pupating. These galls formed on Oregon alders (Alnus rubra) along the shore of Manzanita Lake in Lassen Volcanic National Park.

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