中文摘要：

为探索保护空心莲子草叶甲Agasicles hygrophila安全越冬的有效措施,2007年冬至2008年春通过样方法调查了湖南湘潭空心莲子草叶甲自然种群的越冬虫态与越冬生境。结果表明：空心莲子草叶甲的自然种群在0℃以上的气温条件下,在湖南湘潭的田间成虫可在空心莲子草层下的表层土中、直立茎秆内或匍匐茎秆层越冬,随着气温降低至5℃以下,空心莲子草叶甲由直立茎秆层向匍匐茎秆层或表层土中转移。除空心莲子草生境外,其周围其他生境与其他植物上未发现空心莲子草叶甲扩散分布。建议在霜冻或入冬前适当保护有空心莲子草及叶甲分布的生境,可望提高越冬叶甲种群数量,从而提高来年开春后叶甲对空心莲子草的控制效果。

英文摘要：

To search the effective and protective measures for overwintering of the alligatorweed flea beetle,Agasicles hygrophila,the overwintering stage and habitat of the natural populations of A.hygrophila were investigated using the quadrat sampling method between the winter of 2007 and the spring of 2008 in Xiangtan,Hunan,Southern China.The results showed that the natural populations of A.hygrophila could overwinter in adult on the surface of soil under the alligator weed,Alternanthera philoxeroides,and inside both upright and creeping stems of A.philoxeroides at the air temperature over 0℃ in the fields in Xiangtan,Hunan.A.hygrophila could transfer from the upright stem to the creeping stem layer or the surface of soil with the falling of the air temperature to below 5℃.No A.hygrophila beetles were found in the neighbouring habitats and other plants.It is proposed that the habitats where both A.philoxeroides and A.hygrophila were distributed should be protected suitably before frost or wintertide,and this could increase the number of the overwintering population of A.hygrophila and thus improve the control of A.philoxeroides by A.hygrophila in the next spring.