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abundant adults ambrosia beetles aphids appear areas attack August badly infested balsam bark-beetle birch borer borings branches brood brown brownish Bull California oak moth caterpillars control measure defoliate deposit eggs destroyed dying early spring eggs are deposited enlarged European hornet Fabr feed Felt Fitch foliage forest frequently full grown galleries galls green greenish grubs hickory Hopk Hopkins inch in diameter infested trees injury inner bark irregular July June larch large number larvae latter leaf-beetle leaf-miner leaves limbs Linn locust long when full midsummer N. Y. State Mus northeastern United occasionally occurs oval pest Phylloxera pine plant-lice plants poison poplar pupa reddish Reference 1906 sapwood sawfly scale insects scurfy scale slender species spraying spruce stout sugar maple timber trunks tussock moth twigs U. S. Dept usually V2 inch long walnut weevil whitish willow wing-covers winter witch-hazel wood woolly yellow yellowish young