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2013年我国草地螟发生范围小、发生程度轻、发生区域集中,继续维持2010年以来的轻发态势。总结了2013年我国草地螟各世代各虫态的时空分布特点:越冬代成虫始见期西部早东部晚、灯下蛾峰时空集中、田间蛾峰持续短,虫量低;1代幼虫发生期偏晚、发生密度低、重发区域少;2代成虫蛾峰小、滞留少,2代幼虫零星发生。分析了2013年草地螟轻发生原因为国内虫源基数小、发蛾关键时期气象条件总体不利、天敌控制作用明显。
In 2013, the incidence of meadow moths in our country was small and the degree of occurrence was light, with the regional concentration concentrated, and the slight development trend since 2010 was maintained. The temporal and spatial distribution characteristics of all the insect pests of meadow gilts in China in 2013 were summarized. In the beginning of the overwintering period, the early Eastern part of western China was late, the spatial and temporal distribution of moths in the lamp was short, the moths in the field continued to be short, The late generation, low density, less re-issued areas; 2 generation of small moth peak, less retention, second generation larvae sporadic. The reasons for light occurrence of grass flies in 2013 are analyzed as follows: the domestic insect base is small, the meteorological conditions in the critical period of hair moth are generally unfavorable, and the control effects of natural enemies are obvious.