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刺蛾、黄二星舟蛾、肖黄掌舟蛾等是与秋蚕争食柞叶的主要害虫。正当秋蚕放养开始,这三种害虫也孵化出幼虫,大量吞食柞叶。因此,严重影响柞蚕业生产。蚕农惯于在放蚕前15天喷25％敖百虫与1％亚胺硫磷混台粉防治。由于害虫卵历期较长,防效不理想。我厂于1979年在方山柞树上利用松毛虫赤眼蜂防治上述三种害虫取得明显效果。1981年又在黑夼、回龙夼两个大队400亩柞树上,进行对比试验,得到相似结果。根据害虫卵期,6月下旬放首次蜂,亩总蜂量20万头左右,分5次放,以每亩喷2.5％敌百虫与1％亚胺硫磷混合粉5—6斤为对照。防治刺蛾的效果放蜂区卵粒寄生率达81.29—82.7％,百墩柞树残虫27—63头,施药区卵粒自然寄生率7.43—
Sting moths, yellow two-star boat moths, Xiao Huang Zhang boat moth and autumn silkworm fight the main insect pests. Just when autumn silkworm stocking began, these three kinds of pests also hatch larvae, a large number of devour oak leaves. Therefore, a serious impact on tussah industry production. Silkworm farmers accustomed to spray 25% of the first 15 days before the silkworm mixed with 1% imidacloprid mixed powder prevention and control. Due to the longer duration of pest eggs, prevention is not satisfactory. I plant in 1979 in Fangshan oak tree Trichogramma Trichogramma used to control the three pests achieved significant results. In 1981 and black mound, huilongong two brigade 400 acres of oak trees, comparative test, get similar results. According to the pest period, put the first bee in late June, the total number of acres of bee 200,000, divided into 5 times to spray 2.5% per mu trichlorfon and 1% carbamide 5-6 kg as a control . Prevention and control of the effect of the larvae put the eggs area parasitization rate of 81.29-82.7% bee, seedlings Oaks pier oak 27-63 heads, the natural application of oocysts rate of 7.43-