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Scouting Watch

July 3, 2007

Twig pruners and girdlers are being seen in northeastern Illinois. These roundheaded wood borers cause fallen branches up to 3 feet long under oak, hickory, and other attacked trees. The developing larva of both species is in the branch that falls to the ground. Removing and destroying these fallen branches provides some control and should reduce their numbers next year.

Sod webworm has ceased to be a problem in the state, due to the abundant rainfall. With this soil moisture, the naturally occurring microsporidia should kill enough larvae that turf damage will be unlikely. With the long-range weather forecast predicting recurring rains and average to below-average temperatures throughout July, sod webworms are unlikely to become a problem until later in the summer.

Author: Morton Arboretum Phil Nixon


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