一、第一代粟灰螟卵的发生期 粟灰螟在华北地区年生三代,其中以第一代为害最重,第二代个别年份严重,第三代一般不造成为害。实践证明:掌握卵的发生期是药剂防治此虫的关键所在。粟灰螟在新乡地区三代产卵时期分别在5月中旬至6月中旬,7月中、下和8月中、下两旬。由于第二、三代产卵量少而分散,为害也不严重。因此,主要介绍有关第一代产卵的习性与时期(表1),这对掌握有利时期适期进行喷药防治,关系十分密切。 First, the first generation of rice borer eggs Occurrence of corn borer in North China for three generations, of which the first generation of the most damaging, the second generation of individual years serious, the third generation generally do not cause harm. Practice has proved that: to grasp the occurrence of eggs is the key to pesticide control of this insect. Millet thompson in Xinxiang three generations of spawning period from mid-May to mid-June, mid-July and next, and in August, the next two days. Due to the second and third generation of spawning less and dispersed, the damage is not serious. Therefore, we mainly introduce the habit and period of the first generation of spawning (Table 1), which is closely related to the prevention and control of diseases during the favorable period.