2014年我国草地螟发生情况解析

2014年我国草地螟继续维持2010年以来的轻发态势,发生面积小、发生区域缩减、种群密度低,是第三个暴发周期以来发生最轻的年份。造成轻发的原因主要是越冬虫源基数小、春季死亡率高、关键发生期气象条件不利。在轻发年份进行系统调查和持续监测,对掌握草地螟种群动态、揭示年度变化规律、进行长周期预测有重要意义。

Analysis on occurrence of the meadow moth Loxostegesticticalis in China in 2014

Occurrence of the meadow moth Loxostege sticticalis L. in China in 2014 was keeping the mild trend as recent years since 2010, in fact was the mildest one during the third occurrence period, which was characterized by smallest occurrence area, reductive emergence region and low population density. The main factors causing mild occurrence were small source of overwintering generation, high mortality of population in spring and ill-fitted climatic conditions in critical development period. Even in mild occurrence years, systematic investigation and continuous monitoring are necessary for supervision of annual population dynamic, and long-term forecast of meadow moth.