Archive:Poplar/Gall Insects
From Bugwoodwiki
From: Ostry, Michael E.; Wilson, Louis F.; McNabb, Harold S., Jr.; Moore, Lincoln M. 1988. A guide to insect, disease, and animal pests of poplars. Agric. Handb. 677. Washington, DC: U.S. Department of Agriculture. 118 p.
Contents |
Importance
Several insects and mites cause swelling or galls on the stems, shoots, leaves, and petioles of Populus. Most galls cause local injury that does not affect tree growth or survival. A few galls cause premature leaf fall or stem breakage.
Look For:
• Round, oval, or irregular swellings on the stems, shoots, leaves, and petioles.
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| Leaf Galls. |
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| Stem Galls. |
Biology
Galls are caused by various organisms such as aphids, midges, flies, and mites; each organism has a specific life cycle.
Monitoring
Check trees for galls. Consider control only if the pest is killing shoots or trees.
Control
Seldom recommended. If control is needed, identify pest and follow control recommendations for it.
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| Leaf Galls. |
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| Petiole Gall. |
