Abstract:

Based on normative and continuous field investigation and observation on multi-monitoring-sites in 10 provinces, comparing with historic data, it’s indicated that new characteristics and causes analysis in mild occurrence years are important and inspiring to reveal the annually variational regulations of the meadow moth (Loxostege sticticalis L.) in China. The occurrence area in 2010 is least in the third outbreak cycle in China; nevertheless there were some new characteristics, such as convergent immigration of the first generation moth into northern Shanxi, bringing on next larvae outbreak in local region, and discovery of the second generation larvae and over-winter chrysalis in Altai region of Xinjiang. The mild occurrence were caused by small emergence amount of over-winter generation in 2009, absence of large-scale immigrating moth beyond frontier, and unfitted climate and entironment condition in most northern region in China in 2010 spring. As the conclusions, this paper emphasized the impact of out-boundary immigration population and micro-habitat condition on abnormal occurrence in Shanxi, the significance of first appearance of the second generation larvae and over-winter chrysalis in Altai region of Xinjiang, the effect of generation reservation on population continuance, and the reason of strengthening surveillance and research on the meadow moth in mild occurrence years.