论文部分内容阅读
显纹地老虎是伊犁地区春播作物苗期的主要害虫之一.此虫发生时间早,来势凶猛,主要为害胡麻、玉米、瓜类,有时也为害冬麦.被害春播作物轻者缺苗断垄,重者毁种重播.如1985年4—5月,伊犁地区七县一市发生面积达100多万亩,受害面积为38.63万亩,翻耕面积5.8万亩,每平方米平均有虫27头,最多达353头,经济损失达一千多万元.一、发生与为害特点显效地老虎在伊犁地区一年发生一代,以卵在田埂杂草下的土表上缝中越冬,翌年4月上旬旬平均气温稳定通过9℃、地表温度达11.6℃时,越冬卵开始孵化.4月上中旬(日
Indigenous tiger is one of the main pests of the spring sowing seedlings in Yili Prefecture.It occurs early and fiercely and mainly affects flax, corn, melon and sometimes winter wheat. In April-May 1985, an area of over 1 million mu occurred in seven counties and one city in Yili Prefecture, with an affected area of 386,300 mu and a plowed area of 58,000 mu, with an average of 27 per square meter First, up to 353, the economic loss of more than 10 million yuan.One, the occurrence and damage characteristics Effectively Tiger in the Ili region a year to produce a generation of eggs in the stamen weeds in the soil surface stitching winter, the following year 4 Over the first ten days of the month, the average temperature is stable and passes through 9 ℃ and the surface temperature reaches 11.6 ℃,