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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。
In order to explore the effective measures to protect Agasicles hygrophila from overwintering, the natural populations of Alternanthera philoxeroides from Xiangtan, Hunan Province from 2007 to the spring of 2008 were investigated for their overwintering habitats and overwintering habitats. The results showed that in the natural population of Alternanthera philoxeroides, adults in the Xiangtan of Hunan Province could winter in the topsoil under the lotus seedweed, upright stalks or stoloniferous stalks at temperatures above 0 ℃, The temperature dropped below 5 ° C, Alternanthera philoxeroides leaf from stalk to stalk stalk layer or surface soil transfer. Except for Alternanthera philoxeroides, there was no dispersal distribution of Alternanthera philoxeroides in other habitats and other plants around it. It is suggested that proper protection of the habitats with Alternanthera philoxeroides and leafhopper before frost or winterization can increase the population of P. capitatum so as to increase the control effect of A. chinensis on A. philoxeroides in the coming spring.