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Title: Spear-Marked Black Moth
Author: Werner, Richard A.; Baker, Bruce H.;
Source: Forest Insect & Disease Leaflet 156. [Portland, OR:] U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
Publication Series: Forest Insect and Disease Leaflet (FIDL)
Description: The spear-marked black moth, Rheumaptera hastata (L.) (Lepidoptera: Geometridae) is a serious defoliator of paper birch (Betula papyrifera Marsh.) in interior Alaska. Epidemic populations have occurred at 15- to 17- year intervals, persisted for 2 years, and then collapsed. Recorded outbreaks occurred in 1941, acreage unknown; from 1957 to 1958, 5 million acres (2 million hectares) were attacked; and from 1974 to 1975, 2.5 million acres (1 million hectares) were affected. The areas of Alaska infested by the moth have traditionally extended from Tok (near the Canadian boundary) west to Ruby on the Yukon River, and from Fairbanks south to Talkeetna.
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Werner, Richard A.; Baker, Bruce H. 1977. Spear-Marked Black Moth. Forest Insect & Disease Leaflet 156. [Portland, OR:] U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
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