PUPAL SAMPLING OF THE WESTERN HEMLOCK LOOPER, LAMBDINA-FISCELLARIA LUGUBROSA (HULST) (LEP., GEOMETRIDAE) USING BURLAP TRAPS

Three types of burlap traps were designed and tested for the western h emlock looper, Lambdina fiscellaria lugubrosa, in the interior of Brit ish Columbia from 1993 to 1994. While the first two trap types provide d the means for examining the responses of pupating larvae to various layers of burlap band and pocket structure, the third trap type, which had the desirable burlap layers and structure, was used as a sampling tool for the insect. The effects of tree diameter, crown ratio, crown class, defoliation class and basal areas on trap capture appeared to vary with locations. However, a high correlation between trap capture and actual population density was consistently present. Therefore, tra p capture can be used as an estimator of actual population density.