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据1974—1980年在本地区研究,小地老虎越冬代发生有三个蛾峰。初峰多在4月上旬,中峰在中旬,末峰一般在下旬。而中末蛾峰和田间幼虫发生关系至为密切,约占总虫量的80％以上,是予报和防治的重点。当地玉米播期为4月20日左右,4月底至5月上旬,恰在2—3个叶片生育期,如在玉米播种时,用内吸剂处理种子,使种苗带毒,可以防治小地老虎的为害。 1979—1980年试用20％甲胺磷缓释剂拌种,经室内毒效测定:1％、2％、4％用量杀虫率均达100％。拌种后21天田间小区观察,2％用量的保苗效果达83.1—86.1％:在5000亩春玉米、棉花大面积示范,平均保苗效果88.4％。此法不
According to the study from 1974 to 1980 in this area, there are three moths occurring in the overwintering stage of Siberian tiger. The first peak and more in early April, peak in the middle, the peak is generally late. The end moth peak and the occurrence of field larvae are closely related, accounting for more than 80% of the total amount of insects, is to report and control the focus. The local corn sowing date is about April 20, the end of April to early May, just 2-3 leaf growth period, such as corn sowing, with the endosperm treatment of seed, seedling poisoning, can prevent small Damage to the tiger. 1979-1980 trial 20% methamidophos slow-release agent dressing, the indoor toxicity measured: 1%, 2%, 4% dosage insecticidal rate reached 100%. Field observation 21 days after seed dressing, seedling effect of 2% of the amount of 83.1-86.1%: In 5000 acres of spring corn, large-scale demonstration of cotton, the average seedling effect 88.4%. This method is not