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Evaluation of a western false hemlock looper infestation in the upper Flathead Valley, Montana Public Deposited

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  • A western false hemlock looper, Neptyia freeman Munroe, outbreak was detected in the late summer of 1973 at the north end of Flathead Lake. Defoliation, from barely detectable to heavy (most foliage removed from upper half of trees), occurred on Douglas-fir over about 3,000 acres located between Somers and Kalispell, Montana. Other patches of defoliation were conspicuous near Bigfork, Montana. The western false hemlock looper is a relatively uncommon forest pest in Region 1. The only other time it has been reported at epidemic levels in the Region was in 1963 on the National Bison Range near Moiese, Montana. Defoliation during that outbreak was rated as moderate to heavy with from 25 to 85 percent of the needles gone (Tunnock 1964). The outbreak collapsed to natural causes by the fall of 1964.
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