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落叶松早期落叶病和落叶松毛虫均是为害我国北方落叶松人工林的重要病虫害。目前在防治措施上前者主要使用五氯酚钠烟剂,后者主要应用赤眼蜂。我省防治落叶病的放烟时间一般在6月下旬至7月初,防治松毛虫放蜂时间为7月中旬至下旬,其间相差半个月左右。但是,五氯酚钠烟剂对赤眼蜂的毒杀力及残毒期,除省落叶松早期落叶病防治试验会战组于1975年在黄泥河林业局作过部分试验外,尚无资料报导。因此,为了互不影响防治效果长期
Early larch deciduous disease and larch caterpillar are important pests and diseases that damage the Larix principis-rupprechtii plantation in our country. Currently in the prevention and control of the former mainly used pentachlorophenol sodium smoke agent, the latter mainly Trichogramma. Smoke prevention and control of deciduous diseases in our province generally in late June to early July, the control of pine caterpillars put the bee time from mid-July to late, during which a difference of about two weeks. However, there is no report on the toxicity and residual toxicity of pentachlorophenol to Tobacco Trichogramma except for the Provincial Larch Prevention and Control Experiment on Deciduous Diseases, which was conducted by the Huanghu River Forestry Bureau in 1975 . Therefore, in order not to affect the long-term prevention and control effect