The recent Canadian record in applied biological control of forest insect pests
1988
Hulme, Michael A.
The applied biological control of 21 forest insect pests was recently evaluated in Canada. One-third of these pests have been almost permanently controlled in their present environment. One-third of the pests can be controlled for one to several pest generations. The remaining third were either not controlled or the evaluation of the applied biological control has not been completed. Benefit:cost data are scant and those available are rudimentary. Ratios of at least 20:1 were calculated for two successes with long-term control. Higher ratios were obtained when the control economics were examined from the perspective of the forest manager. Only the production of Bacillus thuringiensis is sufficiently profitable for private industry to undertake supply. Applied biological control has a good record of environmental compatibility. Prospects for the control method are briefly outlined.
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