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Current approaches to biological control of agricultural insect pests
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adults aerial Agriculture Canada Alberta application attack Bacillus thuringiensis balsam fir beetle biological control agents British Columbia Brunswick Canadian Entomologist Canadian Forestry Service casebearer chemical insecticides Choristoneura fumiferana cocoons Coleophora Coleoptera Commonwealth Institute conicus Control Attempts crop defoliation density disease dosage effective eggs Entomological Society established Euphorbia Europe European feeding females field foliage Forest Insect Forest Research Centre forest tent caterpillar galls geniculata Germany gypsy moth Harris host Hymenoptera infestations insecticides insects instar Institute of Biological introduced knapweed laboratory larch sawfly larvae leafy spurge Lepidoptera Literature Cited Manitoba microsporidia mortality native Newfoundland North America Nova Scotia nutans Ontario outbreak overwintering oviposition parasitism parasitoids pathogens personal communication Peschken Pest Status pine sawfly plants plots population predators province pupae Quebec ragwort reared reduced Releases and Recoveries reported Saskatchewan seed sertifer Smirnoff species spray spruce budworm studies Table tests Thuricide trees tussock moth viruses weed weevil western Canada Zwolfer