Dock sawfly

Dock sawfly

Ametastegia glabrata (Fallén)

Hymenoptera: Tenthredinidae

The adult is bluish black with red legs (A). The larva (B) is a smooth velvety green worm with white legs (3 pairs of true legs and 7 pairs of prolegs) and a dark head.

  • Damage

    Attacks apple mainly. The larva digs brownish circular holes (C) on the surface of nearly mature fruit and creates short tunnels in the flesh. Larvae of only the last 1–2 generations are found in the trees.


    This insect causes few problems, most of which are related to the proximity of plants from the buckwheat family (dock, sorrel, knotweeds, bindweeds, etc.). An effective weed management program constitutes a good means of prevention.

    Crops Affected

    • Apples
Michigan State University Michigan State University Close Menu button Menu and Search button Open Close