Canadian Forest InsectsDivision of Forest Insects, Entomological Branch, Department of Agriculture, 1930 - Beneficial insects |
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adult beetles adult insect AGRICULTURE DIVISION Agriculture Ottawa airplane dusting appear areas ARTHUR GIBSON Dominion ASSOCIATE DOMINION ENTOMOLOGIST attack balsam buds balsam fir bark black spruce BRANCH ARTHUR GIBSON brown budworm outbreaks calcium arsenate CANADA DEPARTMENT Cape Breton Island caterpillars cocoon colour defoliated DEPARTMENT OF AGRICULTURE DIVISION OF FOREST Dominion Entomological Laboratory Dominion Entomologist Published dying Early Feeding Eastern Canada eaten egg-tunnel eggs emerge ENTOMOLOGICAL BRANCH ARTHUR EUROPEAN PINE SHOOT FOREST INSECTS J. J. full grown Gardiner GIBSON Dominion Entomologist grubs hatch Honourable James G inch in length inch long infested trees J. J. DE GRYSE J. M. SWAINE ASSOCIATE JACK PINE SAWFLIES James G July killed larch sawfly larvæ Minister of Agriculture needles parasites PINE SHOOT MOTH Published by direction pupa red spruce SEASONAL HISTORY silken skidways species spread spruce budworm stage stands of balsam SWAINE ASSOCIATE DOMINION tunnels western hemlock white spruce wood yellowish