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总结了2009年草地螟发生特点:越冬代成虫始见期早、盛发期长、发生数量大、范围广;1代幼虫始见期早,高峰期接近常年,发生面积较大,黑龙江大部和华北局部为害重;1代成虫和2代幼虫发生范围小,为害轻。分析了2009年草地螟发生原因:春季气温偏高,导致越冬代成虫始见期明显提早,越冬区域经、纬度和海拔跨度大,导致越冬代成虫峰次多和历期长;春、夏季干旱,导致1代幼虫未大面积严重为害,且2代草地螟发生轻,符合草地螟常年发生规律。提出了温、湿度条件是影响草地螟年度间变化的重要因素,草地螟越冬虫量与翌年1代发生有相关性、我国草地螟跨年代跨代次的长期预报水平有待提高等观点。
The characteristics of the occurrence of Meadow Borer in 2009 are summarized as follows: The overwintering adult adults begin early, have a long growing season, occur in a large quantity and have a wide range. The first generation larvae begin early and peak period is near perennial with large area, most of Heilongjiang And North China local damage heavy; 1 generation and 2 generations of adult larvae occurred in a small range, the damage light. The reasons for the occurrence of Meadow Stem Borer in 2009 were analyzed. The high temperature in spring resulted in significantly earlier onset of overwintering adult adults, longitude, latitude and altitude span overwintering areas, resulting in the peak times and long periods of overwintering adults. The spring and summer drought , Which caused the first-generation larvae not to be severely damaged in large area, and the second-generation grasshopper occurred lightly and accorded with the perennial occurrence of the grasshopper. It is put forward that the temperature and humidity conditions are the important factors that affect the annual variation of meadow moth, the correlation between the number of overwintering moth and the first generation of next year, and the long-term forecast of intercropping of meadow moth in China.