海南冬季玉米种植区草地贪夜蛾种群动态调查

对草地贪夜蛾发生情况进行了定点调查与监测.结果表明,海南6个调查点冬季均有草地贪夜蛾为害玉米,为害偏向于苗期、小喇叭口期和大喇叭口期,植株受害率分别为15.59％、13.16％和12.67％,抽雄期后为害显著减少;不同地区草地贪夜蛾幼虫发生程度不同,三亚和东方较为严重,峰值出现在2月,百株虫量分别为33.32头和30....

Investigation on the Population Dynamics ofSpodoptera frugiperda in Winter Corn Planting Areas of Hainan

The occurrence of Spodoptera frugiperda was investigated and monitored at designated locations. The result showed that the corn in the six areas could be harmed in winter by S. frugiperda,and seriously damaged in seedling stage, small bell stage, big bell stage mouth, with a plant damage rate 15.59%, 13.16% and 12.67%, respectively. There was less damage after anthesis stage. There was difference in the occurrence of S. frugiperda in different areas. The damage in Sanya and Dongfang was more serious, that in Haikou and Danzhou was lighter, and the insect state was the highest proportion of 3rd instar larvae. The peak appeared in February, and the larva per 100 plants was 33.32 and 30.72 respectively in Sanya and Dongfang. There were 2 peaks in the trapping dynamic, and the average moths of S. frugiperda was significantly higher in Sanya and Dongfang (16.09 heads and 15.07 heads respectively) than that in Danzhou (5.27 heads). The investigation showed the dynamics of in some winter corn planting areas in Hainan. The occurrence and damage caused by S. frugiperda were serious in south breeding areas and Dongfang, while the populations in the western and northern areas were relatively low. The results would provide evidence of the monitoring and control of S. frugiperda in Hainan Province.