2017年陕西省2代黏虫大发生特点和原因分析

Occurring characteristics of the second generation Mythimna separata Walker and analyses on its causes in Shaanxi province in 2017

2017年陕西省2代黏虫继1996年、2012年大发生后再次猖獗发生,并对部分地区玉米生产造成了严重损失。鉴于此,笔者在查阅历史资料的基础上,结合实际调查研究,总结了2017年陕西省2代黏虫的发生具有间隔期缩短,发生范围广、面积大、为害重,关中发生期提前、与陕南几乎同步发生等特点。分析探讨了引起大发生的原因,即江淮和黄淮麦区1代黏虫虫源量大,当地1代成虫诱蛾量偏高,但始见期偏晚,气象条件和其他环境条件有利于黏虫大发生,并提出了今后有待深入研究的问题。旨在为黏虫的科学准确测报,及时有效防治提供参考依据。

The second generation of oriental armyworms, Mythimna separata Walker, rampantly occurred and caused serious damage of maize production in partial areas of Shaanxi province in 2017. Therefore, on the basis of history records and investigation, outbreak characteristics of the second generation of the insect in 2017 were summarized, including a shortened interval of outbreak, wider range, a large area, serious damage, early occurring in Guanzhong which was synchronized with that in southern Shaanxi province. Then, the causes of its outbreak were analyzed. Number of the first generation armyworms and the trapped moths was large, but the initiate occurring date was delayed in Huang-Huai and Jiang-Huai wheat-cultivated area, where local meteorological and other conditions were suitable. At last, some questions needed to be intensively studied in the future were proposed, which would provide references on scientific and precise prediction and the efficient prevention of M. separata.