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adult insect AGRICULTURE DIVISION Agriculture Ottawa Appearance of Outbreak ARTHUR GIBSON Dominion BALSAM WOOLLY APHID bark begin to feed black spruce Black-headed Budworm bore BRANCH ARTHUR GIBSON British Columbia calcium arsenate CANADA DEPARTMENT caterpillars cocoons colour DEPARTMENT OF AGRICULTURE DIVISION OF FOREST DOMINION ENTOMOLOGICAL LABORATORY Dominion Entomologist Published Eastern Canada ENTOMOLOGICAL BRANCH ARTHUR EUROPEAN PINE SHOOT EUROPEAN SPRUCE SAWFLY flies foliage FOREST INSECTS Dr FOREST INSECTS J. J. Gardiner GIBSON Dominion Entomologist green grubs Habits and Injury hatch hemlock holes inch in length inch long infested trees J. M. SWAINE JACK PINE SAWFLIES James G July June larch sawfly mature balsam Minister of Agriculture Monochamus moss and litter N.B. Special Circular numbers parasites PINE SHOOT MOTH Posthorn Published by direction pupae R. E. BALCH ENTOMOLOGIST Robert Weir SAWYER BEETLES Seasonal History species spray spruce budworm stage stripped swainei tunnels twigs Witch's broom wood yellowish young larvae