When are spray blocks treated?
Spray block treatment is timed when the caterpillars are in the first 3-4 weeks of development (1st & 2nd instar) and leaves have expanded enough to intercept the spray. The timing is based on daily observations of caterpillars and leaf development. Spraying could begin in mid-May or as late as early June. Weather permitting, spraying may start at 6 a.m.in the morning and continue as long as weather conditions remain favorable. Please call the office at 989-275-7135 by mid-May for updates or visit the Gypsy Moth page.

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1. Why does Roscommon County spray?
2. What biological insecticide is used?
3. Was my property chosen for spraying this year?
4. When are spray blocks treated?
5. Will the trees in my yard or woodlot die once the leaves are completely chewed off by the gypsy moth?
6. Why is there a Suppression Spray Program?
7. How do I request spraying or apply to a Suppression Program to be sprayed if I live outside the county?