2019年草地贪夜蛾在陕西省汉中市的发生为害情况调查

2019年5月31日在陕西省汉中市洋县和镇巴县玉米地首次发现草地贪夜蛾Spodoptera frugiperda (J.E.Smith)幼虫, 到7月8日, 该虫已蔓延至全市所有的11个县区?调查结果显示, 2019年草地贪夜蛾在全市11个县区99个镇393个村发生, 累计发生面积1 004.93 hm2, 平均百株虫量11.01头, 最高百株虫量46头, 平均被害株率10.3%, 最高被害株率80%?通过在全市调查, 只发现草地贪夜蛾幼虫为害玉米, 主要为害玉米心叶幼嫩组织, 在玉米处于大喇叭口期以后生长阶段, 以大龄幼虫为主, 玉米抽雄后幼虫很少, 为害较轻?

Investigation of the occurrence and damage of Spodoptera frugiperda in Hanzhong city, Shaanxi province in 2019

On May 31, 2019, Spodoptera frugiperda (J.E.Smith) was first found in the maize field of Yangxian and Zhenba counties, Hanzhong city. By July 8, it had spread to all 11 counties and districts of the city, to which attention should be paid. The investigation results showed that the occurrence area of S.frugiperda was 1 004.93 hm2 in 393 villages of 99 towns in 11 counties and districts of the city, with an average of 11.01 pests per hundred plants, a maximum of 46 pests per hundred plants, an average of 10.3% injured plants and a maximum of 80% injured plants. Through the investigation in the whole city, it was found that the larvae of S.frugiperda harmed the whole maize, mainly the heart leaf and the young tissue of the leaf. The full-grown larvae dominated the growth stage of maize after the bell period, but the larvae were scarce after the tassel stage and only minor damage was incurred.