中文摘要：

草地螟（Loxostege sticticalis L.）（鳞翅目：草螟科）是一种世界性害虫,主要在36~55°N的广阔地区为害。在我国,草地螟主要在华北、东北和西北地区为害,并经常暴发成灾和造成重大经济损失。为了更好地阐明草地螟的种群动态规律、揭示影响其暴发成灾的关键因子,减少其灾害损失,本文通过历史文献分析,结合所在实验室多年从事草地螟研究所获的证据,得出了温湿度是影响草地螟发生为害规律的关键因子的结论。主要依据是：温湿度限定了草地螟的发生为害区域;左右着草地螟存活率的高低、个体及生殖能力的大小以及种群增长的快慢;控制着草地螟滞育和迁飞行为的发生并影响着种群动态;决定着田间发生为害场所、时间和暴发成灾程度。最适合草地螟种群增长的条件是21~22℃和RH 60%~80%。在适宜的温湿度条件下,草地螟存活率高、生殖能力强、种群增长快,发生为害或成灾的可能性增加。超出这个温湿度范围,各项参数下降,幼虫滞育和成虫迁飞的可能性增加,大发生的可能性下降。因此,根据幼虫发生期的温湿度条件变化就可以确定幼虫滞育的比例以及下代幼虫的发生为害情况。而根据成虫盛发期温湿度条件的变化以及成虫发生量的大小,就可以预测草地螟的发生为害场所、时间及暴发成灾程度。

英文摘要：

The beet webworm, Loxostege sticticalis L. （Lepidoptera： Crambidae） is a cosmopolitan insect pest in- habiting in the temperate zones of 36-55° N. Serious damages and significant economic losses are often resulted from the outbreak populations in northern China. The effects of temperature and relative humidity （RH） on population growth, diapause and migration, and occurrence area, period and outbreak degree of L. sticticalis were reviewed by combining the published evidences and data obtained in our laboratory. This work is important for understanding the mechanisms underlying the population dynamics and outbreaks, improving the prediction and management tactics, and reducing the yield and economic losses caused by this species. We conclude that temperature and RH are the critical factors that determine the fluctuation of population dynamics and outbreak degree of L. sticticalis. Firstly, it is the temperature and RH that confine the areas where L. sticticalis is distributed and dam- ages. Secondly, the growth and developmental speed, the survival rate of eggs and larvae, reproductive potentials of the moths, and population increase rate are all significantly affected by temperature and RH. Thirdly, the inci- dences of diapause and migratory behavior, the actual infestation areas, period and outbreak degree in the fields are also determined by temperature and RH. Our results also showed that 21-22℃ and 60%-80% RH were the suitable conditions for the survival and reproduction, population growth, and the possibility for incidence of damage or outbreak increased. However, all these parameters were negatively affected and possibility for the incidence of diapause and migration increased when temperature and relative humidity were beyond this scope.