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敌敌畏是熏杀作用极强,并有强烈击倒作用的有机磷制剂。通过将敌敌畏加工成缓释型对玉米螟进行滞留熏蒸取得良好效果。通过1982～1984三年试验及大面积防治试验得知:用敌敌畏滞留熏蒸法防治玉米螟,持效期长,可兼治两代玉米螟。施药方法简易,每亩只需均匀挂入30个缓释药袋(含原油100～150克)即可取得明显效果。此法可摆脱逐棵玉米投药的笨重劳动。从室内测定结果看,敌敌畏滞留熏蒸可杀死玉米螟成虫及一龄幼虫。从施药量看,每亩用原油100～150克均有效,但以亩施150克为好。从施药时期看,以越冬代螟蛾始盛期(6月中、下旬)优于一代螟蛾始盛期(8月初),这样可减少对自然发生的玉米螟赤眼蜂的杀伤。通过田间系统调查表明,每亩施敌敌畏原油100克,只要于越冬代螟蛾始盛期施入,对玉米田各种天敌影响甚小。敌敌畏滞留熏蒸田与对照不施药田的天敌数量相比,各种天敌数量并来明显减少。至于亩施原油150克者,只要避开于玉米螟赤眼蜂开始增长的8月初施药即可。
Dichlorvos is a highly effective fumigation and has a strong knock-down effect of organic phosphorus formulations. By dichlorvos processed into a sustained release of corn borer stranded fumigation achieved good results. By 1982 ~ 1984 three years of trials and large-scale prevention and control test that: with dichlorvos stay fumigation method to control corn borer, persistence period, can be two generations of corn borer. Application method is simple, just per mu per day linked to 30 sustained-release sachets (including crude oil 100 to 150 grams) to obtain significant results. This method can get rid of cumbersome labor dosing corn by corn. From the indoor determination results, dichlorvos stranded fumigation can kill corn borer adults and first instar larvae. From the amount of application, the use of crude oil per acre 100 to 150 grams are valid, but to 150 grams per mu is better. From the perspective of application period, the overwintering generation of stem borers was superior to that of the first generation of stem borer (mid-August) in the beginning of mid-June (mid-June), which could reduce the natural damage to the Trichogramma ostriniae. According to the field investigation, 100 grams of DDVP crude oil per mu was applied in the initial stage of wintering moth, and had little effect on various natural enemies in corn field. Dichlorvos stay fumigation field and the control does not apply the field of natural enemies compared to the number of various natural enemies and significantly reduced. As for 150 grams of crude oil in Mushi, as long as the trichogramma beetle began to grow in early August can be applied.