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随着种植业结构的调整等原因,近年豆天蛾为害日渐加重。1987年见蛾时间长,诱蛾量之多超过历年。曲周县5月29日始见蛾;香河县6月14日见蛾,到7月底1台黑光灯共计诱蛾2960头,比去年同期多2346头;廊坊7月上中旬诱蛾量是去年同期的9倍;馆陶日诱蛾441头;大城日诱蛾444头。 曲周县调查,卵株率81％,百株有卵230粒;虫株率77％、百株虫量105头。永年县卵株率90％,百株有卵180粒,幼虫120头,最高210头。衡水地区发生33.3万亩。从全省田间调查情况看,7月下旬至8月上旬进入产卵孵化盛期,8月上中旬为幼虫盛期,也是为害和防治适期。 发生严重的原因;除大豆种植面积扩大,过去没有防治习惯和经验,累计虫量增
With the adjustment of planting structure and other reasons, in recent years, moth damage increased. See the moth in 1987 for a long time, the amount of moths more than calendar years. Quzhou County May 29 saw the moth; Xianghe County saw the moth on June 14, by the end of July 1 black light total of 2960 moths, more than 2,346 more than the same period last year; Langfang in mid-July on the amount of lure last year 9 times over the same period; Guantao day lure moth 441; Ayutthaya day lure 444 head. Quzhou County survey, the egg plant rate of 81%, one hundred eggs 230; insect strain rate of 77%, 105 strains of insect population 105. Yongnian County egg plant rate of 90%, one hundred eggs 180, larvae 120, the highest 210. 33.3 hectares occurred in Hengshui area. Field surveys from the province to see the situation, from late July to early August into the peak incubation of hatching, mid-August larval mid-life, but also damage and control of the right period. A serious reason for the occurrence; In addition to the expansion of soybean acreage, the past no control habits and experience, the cumulative increase in insects