稻纵卷叶螟成虫迁入量调查

An Investigation on The Immigration Amount of Rice Leaf-roller, Cnaphalocrocis medinalis Guenee

1983—1987年对稻纵卷叶螟第1、2代,1983,1985年第5代成虫的迁入量进行了调究。结果表明,1,2代成虫迁入量主要与风向,风力等气候因素有密切关系。从4月份开始,当气温达到21℃以上时,连续吹4天以上风力为2～4.8m/s的东南风,将有成虫迁入。关于迁入量,随着吹东南风日数的增加而增加;198s年主峰出现于4月中旬至5月初,以第1代迁入为主;其余调查年份主峰均出现在5月中、下旬至6月初,以第2代迁入为主。晚稻田迁入者为第5代,时间在8月下旬至9月上旬.

An investigation on the immigration amount of rice leaf—roller in the 1st and 2nd generations was conducted from 19831987.It was reported that the time and amount of immigrant are influenced by the direction and strength of wind in spring.In 1983 the immigrating adults occurred in the first generation, because of south wind blowing succesively in the early and the middle April.But from 1984 to 1987, no south wind blowed succesively in April, the immigrating adults both occurred in the second generation.It was also reported from 1983 and 1985 that the peak time of immigrating adults in 5th generation was in late August or in early september.