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玉米螟在我省绝大部份地区每年发生二代,仅少数高寒地区为一个世代。第一代玉米螟卵的发生期一般在6月中旬到7月上中旬,田间自然天敌少,寄生率极低;第二代卵的发生期为8月初到9月上旬,但自然天敌种类多,被赤眼蜂寄生率常高达90%以上,对二代玉米螟有很大抑制作用。6—8月份为我省温度较高、降雨量较多的季节,既适于玉米等作物的生育,也是玉米螟等多种害虫为害的盛期。我省过去主要推广666颗粒
Corn borer occurs in most areas of our province every second generation, only a few alpine areas for a generation. The first generation of corn borer eggs usually occur in mid-June to mid-July, with few natural enemies in the field and very low parasitic rates. The second generation eggs occur from early August to early September, but there are many natural enemies , Trichogramma parasitic rate is often as high as 90%, on the second generation of corn borer has a great inhibitory effect. From June to August, it is the season with higher temperature and more rainfall in our province, which is suitable not only for the growth of maize and other crops, but also for the damage of corn borers and other pests. My province in the past to promote 666 particles