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我站于1980年对我县三代稻纵卷叶螟研制了一个自然种群生命表,并进行为害损失测定,现将主要结果简报如下。一、研究方法 1980年我县三代稻纵卷叶螟大发生,先后出现三次发蛾高峰,我们选择了一头3.7亩长势长相一致、苗情较好的中稻田,不施农药,从三代稻纵卷叶螟产卵开始,自各虫态始见到结束,定点检查,作调查试验。中稻是杂交稻,6月中旬栽插,密度为4×6寸,每亩2.5万穴。 (一)卵期:随机取样25点,每点定4穴,共查100穴,每2天
I stood in 1980 on the three generations of my county rice leafroller developed a natural population life table, and damage determination, the main results are summarized below. First, research methods In 1980 three generations of rice in my county leafroll occurs, there have been three hair moth peak, we have chosen a 3.7 acres of growing looks consistent, better seedling mid-field, without pesticides, from three generations of rice vertical Leafroll borer spawning began, since the end of each state to see the end, sentinel check, for investigation. Medium rice is a hybrid rice, planted in mid-June, the density of 4 × 6-inch, 25,000 acre per acre. (A) Egg stage: Random sampling of 25 points, each point of 4 points, a total of 100 points, every 2 days