【摘要】 2018年我国内蒙古、黑龙江、吉林三省交界处草地螟突发高密度种群,导致年度发生面积和发生程度为近10年以来最高。2018年草地螟各世代的发生特点为越冬代成虫发生面积大、内蒙古、黑龙江蛾量高,1代幼虫在内蒙古中东部重发,1代成虫在内蒙古东北部和河北局部种群数量高,2代幼虫仅零星发生。分析了我国东北局部种群数量突增的原因,即越冬代成虫异地大量迁入,且重发区域空中风场和天气条件有利于成虫降落和产卵。更多还原

【Abstract】 In 2018, meadow moth Lox ostege sticticalis broke out in the boundary region between Inner Mongolia,Heilongjiang and Jilin provinces, resulting in highest occurrence degree and largest area in past 10 years in China.Occurrence of all generations was characterized generally as follows: the occurrence area of overwintering adults was fairly large with high density in Inner Mongolia and Heilongjiang provinces; the 1^st generation larva occurred seriously in the middle-east of Inner Mongolia; the population of the 1^st generation adults in northeastern Inner Mongolia and partial Hebei were relatively high; the 2^nd generation larva population was mild and sporadic. The outbreak of L. sticticalis in northeast China in 2018 was correlated with some factors, including large amounts of immigrant adults, favorable wind and weather conditions for adult landing and laying eggs.更多还原