K.C. Kendall F. Forcella T. Weaver 1990 In the whitebark pine /whortleberry (<i>Pinus albicaulis/Vaccinium scoparium</i>) habitat type of southwestern Montana, whortleberry plants produced seven to 69 berries/m2 x yr in 1974. In subalpine fir (<i>Abies lasiocarpa</i>) habitat types of northwestern Montana, huckleberry plants (<i>Vaccinium globulare</i>) may produce from 13 to 228 berries/m2 X yr. While removal of competing trees increases production, thinning the understory apparently reduces berry production in direct proportion to the shrubs removed; there is no compensatory production indicative of shrub-shrub competition in fully vegetated plots. Fifty-to 100-fold variation in production among years in <i>Vaccinium globulare</i> berry production is attributed to variation in weather conditions. application/pdf en U.S. Department of Agriculture Berry production in three whitebark pine forest types book