金华地区的稻纵卷叶螟,在早稻穗期,迟发年的2代、早发年的3代通常发生量较大,天敌跟不上害虫数量的激增,应侧重于化防。在晚稻分蘖期和穗期,迟发年的3、4代幼虫被寄生率较高,应侧重于保护自然天敌;早发年的4、5代幼虫被寄生率不高,仍以化防为主。 In the Jinhua area, the first three generations of the second generation of early rice and the early onset of the rice leafroller occurred in the early rice stage. The natural enemies could not keep up with the sharp increase in the number of pests. The third and fourth instar larvae in later years were parasitized at the tillering and heading stages of late rice, and should focus on the protection of natural enemies. The 4,5 and 4-th larvae of early-onset were not parasitized, the Lord.