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近年来,全国各地通过对稻纵卷叶螟Cnaphalocrocis medinalis Guen?e的广泛研究,证实了稻纵卷叶螟是一种迁飞性害虫。 我县地处海南岛东部,北纬19.15。、东径110.28°。历年来4月中下旬的第三代螟蛾,是上半年螟蛾量最大的一代,但在5月却很难找到被为害卷叶的水稻。6月中下旬,多数年份又出现螟蛾突增,7月上中旬正当晚造插秧大忙时,出现大面积早插田被卷叶吃白现象。9月一般已很少卷叶为害,但在10月、11月又出现大量卷叶螟蛾,至11月田间幼虫密度迅速回
In recent years, extensive research on the Cnaphalocrocis medinalis Guen? E has been carried out across the country, confirming that the Cnaphalocrocis medinalis is a migratory pest. My county is located in the eastern part of Hainan Island, latitude 19.15. , East path 110.28 °. The third generation of Pyralidae in late April of this year was the largest generation of Pyralidae in the first half of the year, but in May it was very hard to find the rice that was damaged by foliar leaf. In mid and late June, most of the year there was a sudden increase of Pyralidae. In mid-July of the same year, when planting transplants was busy in the middle of the night, a large area of early-fringed fields appeared and the leaves were eaten white. In September, leaf decay was rare, but a large number of leaf moths were found again in October and November, and the density of field larvae quickly returned to November