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To date, 51 of Ohio's 88 counties have established gypsy moth populations.
There are three defined zones in a spreading infestation. One is the "Infested Zone", in which the pest population is well established and colonies overlap. The second zone is the "Transition Zone", in which isolated pest populations have developed, but are not generally overlapping. The third zone is the "Uninfested Zone", in which no pest populations have developed.
(Diagram supplied by STS Decision-Support System)
The Ohio Department of Agriculture operates three programs aimed at managing the gypsy moth in Ohio. The three programs mirror the three zones defined in a spreading infestation.