Douglas-fir tussock moth populations are monitored annually in northern Idaho and western Montana to insure early detection of changes from endemic to outbreak population levels. Adult moth trapping in 1982 was intensified and expanded into additional areas from 1981 because of concern that with each passing year the probability of a tussock moth outbreak is more imminent. Annual increases in trap catches from 1980 through 1982 and reports during the summer of 1982 of defoliated yard and farmstead trees at various locations strongly suggest that populations are building. This report summarizes results of the 1982 adult population monitoring.
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