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Pear slug (Pear sawfly)

Caliroa cerasi (L.)
Hymenoptera: Tenthredinidae

The adult looks similar to a small, black-bodied wasp with the ventral side and legs yellow in color. The larva is small, fleshy, dark green to orange, slug-like, and slime-covered, with the front part of the body enlarged (A). As the pear slug grows in size, it becomes somewhat lighter in color, until it is nearly orange-yellow when full grown (B).


Most fruit-growing states and provinces in eastern North America.


Attacks pear, cherry, and plum. Larvae feed on the surface of leaves, which they skeletonize, leaving only a framework of veins (C).


Foliar insecticide sprays applied shortly after petal fall will control pear slug; larvae can also be washed off the foliage of backyard trees with a strong stream of water. Rarely a pest in commercial plantings.

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The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the AgBioResearch, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.