新乡稻纵卷叶螟发生规律初步研究

A PRELIMINARY STUDY ON THE REGULARITY OF THE OUTBREAK OF RICE LEAF ROLLER CNAPHALOCROCIS MEDINALIS GUENEE IN XINXIANG

稻纵卷叶螟Cnaphalocrocis medinalis Guen′ee是水稻上一种重要虫害。1977年以来,全国开展了大协作研究,证实了稻纵卷叶螟具有远距离迁飞的特性。为了掌握稻纵卷叶螟在新乡的发生规律,为预报和防治工作提供科学依据,我们于1975年—1978年对稻纵卷叶螟发生规律进行了初步调查研究。

The rice leaf roller Cnaphalocrocis medinalis Guenee Can not overwinter in Xinxiang District. Early moths immigrate from the south to this locality. Their eariest immigration begins in last ten days of June. They immigrate in great numbers from the last ten days of July to the first ten days of August. In Xinxiang District outbreak of the rice leaf roller Cnaphalocrocis medinalis Guenee, according to their different sourses, may be divided into five stages as fellows:whole immigration, main immigration, local breeding, main migration and basic migration. The time of southward migration of the rice leaf roller Cnaphalocrocis medinalis Guenee may have modification owing to the yearly flucfuation of temperafure and moisfure in last ten days of August.