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40 gallons acid bales balsam fir Balsam Woolly Aphid blemished foliage branches and sprouts branches were pruned brush killer Caterpillar cause noticeable discoloration Christmas tree industry Conical Conical crop of Christmas crop trees culled damage defec defective quarter Denser Denser density class detract epidemic factors faulty quarter feathery ﬁr gallons of water GRADING OF CHRISTMAS grown for Christmas harvesting Hemlock Imperial gallon individual trees insect Lightly blemished long branches loss before Christmas loss of needles lower branches needle spots needle-drop needles growing nicotine sulphate Nova Scotia open density original tree ounces per Imperial pint pounds to 40 quarter tive quarter removed result seed supply seed trees segments serious shoots Slender smaller trees soft maple spray sprouts grew stand stems stump culturing tall Taper thin tree growth tree with open trees are cut TREES FOR CHRISTMAS trees from Nova trimmed twigs which appear velopes weed killer white birch whorl