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Forest tent caterpillar

Small, isolated populations of this defoliator were located in central Minnesota on the south side of Lake Koronis in northeastern Meeker County, between Big and Little Birch Lakes in southeastern Todd County, on the northeastern side of Beauty Lake in eastern Todd County, on the eastern side of Bay Lake in Crow Wing County, on the northwestern side of Gull Lake in Cass County, and the southwestern side of Anne Lake in Kanabec County. By June l2th. these caterpillars had grown to about l l/2 inches long. A bacterial insecticide was applied to the Birch, Gull, and Koronis Lakes caterpillar populations by property owners associations. Defoliation was limited to basswood. Ground surveys for forest tent caterpillars were completed during the first week of June in Region I. No defoliation was observed as of June 13th. Hardwood stands with defoliation in 1995 have been revisited both in 1996 and this spring. It appears that FTC populations in Douglas and Ottertail Counties have collapsed since 1995.