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通过引进寄生昆虫和借鉴美国西北部生物防治工作经验,使加拿大东部和中部落叶松鞘蛾防治获得成功(Webb 和Qnednan 1971),也导致1974年在不列颠哥伦比亚省继续应用寄生昆虫防治落叶松鞘蛾。1973年在不列颠哥伦比亚省对落叶松鞘蛾的寄生天敌进行了深入细致的调查,获得了32种膜翅目天敌。1968年后在魁北克继续进行弯尾姬蜂[Diad
Successful introduction of parasitic insects and learning from the experience of biological control in the northwest of the United States led to success in the control of C. larvae in eastern and central Canada (Webb and Qnednan 1971) and the continued application of parasitic insects in 1974 in British Columbia . 1973 in British Columbia on the larch shell moth parasitoids conducted a detailed investigation of natural enemies, obtained 32 kinds of Hymenoptera natural enemies. After 1968 in Quebec continue to bee pollinator [Diad