Issue 2, May 2, 2011

Scouting Watch

In southern Illinois, it is time to treat for lilac (ash) borer. The brown form of oystershell scale found on crabapple is in the crawler stage and susceptible to control. The brown form and the gray form attack lilac, dogwood, and willow, so be sure to check for gray crawlers before treatment. Crawlers of the gray form hatch about a week later than the brown form.

In northern Illinois, Gypsy moth will be hatching and is susceptible to insecticide application.

Throughout the state, fall cankerworm, spring cankerworm, leaf crumpler, pine bark adelgid, spruce needle miner, European pine sawfly, and Eastern tent caterpillar are still susceptible to control. Scurfy scale is susceptible to crawler sprays. (Phil Nixon)

Phil Nixon

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