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玉米螟是河北省主要粮作害虫。过去在玉米心叶期应用颗粒剂防治已可基本控制为害。近年来一些地区耕作改制后玉米螟的为害又有所回升。我们1974年在永清县对耕作改制后玉米螟的发生进行了系统调查,采用农业、物理、化学、生物等措施,进行综合防治试验、示范,初步明确了以下几个问题: 1.通过对玉米螟发生期及生活史的系统调查,初步澄清耕作改制后,夏玉米由收麦后平播,改变为麦垄套播,玉米螟第二代卵,主要产在抽雄吐丝期,而麦茬平播夏玉米则心叶期和穗期各半。这点是近年穗期螟害加重的主要原因。 2.通过试验、示范,找出代替有机氯治螟的药剂。如1％、0.5％、0.25％1605颗粒剂效果高于或略低于5％DDT颗粒剂;白僵菌20倍加0.5％1605,或白僵菌20倍加0.1％1605颗粒剂,效果分别高于或稍低于5％DDT颗粒剂。0.1％、0.2％辛硫磷颗粒剂效果高于0.1％六六六颗粒剂。2.5％螟铃畏颗粒剂,效果与5％DDT颗粒剂相仿。 3.通过采用农业、物理、化学、生物等综合措施,我们认为本地玉米螟的综合防治概括为:“越冬防治,处理秸秆,诱杀成虫,压低虫源;田间防治,菌药结合,安全经济,控制为害”。
Corn borer is the main grain pest in Hebei Province. In the past, the application of granule control in the heart stage of corn has been basically controlled. In recent years, the tillage and restructuring of corn borers in some areas have been some damage. We conducted a systematic investigation on the occurrence of tsetse corn borer after farming and reorganization in Yongqing County in 1974 and carried out comprehensive prevention and control experiments and demonstration using the methods of agriculture, physics, chemistry and biology, etc., and initially identified the following problems: Corn borer and the life cycle of the survey, the initial clarification farming system, the summer corn from the close after the broadcast, changed to the wheat ridge sowing, the second generation of corn borer eggs, mainly produced in the tasseling silking period, and stubble Intercropping summer corn is the leaf stage and spike half. This is the main reason for the worsening of stem borers in recent years. 2. Through experiments, demonstrations, to find out instead of organism Chilo suppressalis medications. Such as 1%, 0.5%, 0.25% 1605 granules were higher or slightly lower than the 5% DDT granules; Beauveria 20 times plus 0.5% 1605, or Beauveria 20 times plus 0.1% 1605 granules, respectively, Or slightly below 5% DDT granules. 0.1%, 0.2% phoxim granules effect is higher than 0.1% BHC particles. 2.5% borer Wei Wei granules, the effect and 5% DDT granules similar. We believe that the comprehensive control of the local corn borer can be summarized as follows: “Overwintering prevention and treatment, straw treatment, trapping and killing adults, and depressing insect sources; field control, combination of bacteria and drugs, safety and economy, Control harm. ”