Honeylocust plant bug and Honeylocust leafhopper

Diaphnocorus chlorionis and Macropis fumipennis

These two insects are often found at the same time feeding on honeylocusts, but plant injury is due almost entirely to the plant bug.

Honeylocust plant bug
Nymph of honeylocust plant bug, about 4 mm long.

Honeylocust plant bugs overwinter under bark as eggs. They hatch and begin feeding as new leaves develop, from late April to mid-May. Nymphs mature into adults in about one month. There is one generation per year.

honeylocust leafhopper
Leafhopper adult about 4.5 mm long.


Look for nymphs as saucer magnolia and bridalwreath spirea are in bloom. Determine population levels by tapping terminals over a white piece of paper. The insects will be visible on the paper. Treatment may not be necessary, unless trees are heavily infested.

honeylocust plant bug injury
Honeylocust leaves distorted and stunted from feeding injury caused by plant bug adults and nymphs. Defoliation may occur on severely infested trees.

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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.