摘要
为揭示草地螟在中国北方农牧区发生危害的年度间变化规律,探明轻发年份的成因和警示意义,通过10个主发省份多个监测点规范连续、广泛系统的测报调查及历史数据比对。结果表明,2010年草地螟发生面积是第3个暴发周期以来最小的一年,在这一轻发年份中,出现了山西北部一代成虫集中迁入、二代幼虫局部成灾,新疆阿勒泰地区首见二代幼虫和越冬茧等新的特点。分析讨论了2010年北方大部农牧区草地螟轻发的主要原因有:2009年境内越冬虫源量少,2010年春季无大规模境外虫源迁入,且大部地区气候和生态条件不适于草地螟的发生。重点讨论了山西北部二代幼虫暴发成因,新疆阿勒泰地区发现二代幼虫和越冬茧的意义,虫源保留地对草地螟种群延续的作用以及在轻发年份加强监测和研究工作的理由。
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 was the 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.
出处
《中国农学通报》
CSCD
北大核心
2011年第18期273-281,共9页
Chinese Agricultural Science Bulletin
基金
公益性行业(气象)科研专项经费项目"农作物病虫害发生气象条件监测
预警和评价技术"(GYHY201006026)
关键词
草地螟
轻发
新特点
成因
Loxostege sticticalis L.
mild occurrence
new characteristics
causes
