谢雨杉+鲍俊超+汪媛媛+张丹丹+曹亚静+魏子千+崔新仪+胡奇

摘 要：本试验对国槐尺蛾（Semiothisa cineraria Bremer & Grey）幼虫特性进行了三方面观察。第一，对各龄期幼虫体表上的毛序特征进行了观察，提供了除已知的体色、斑纹、体长之外的另一个识别幼虫种类的体表特征。第二，在本实验的幼虫饲养过程中，于2013年6月中、下旬至7月中、下旬发生的当年第一代幼虫中观察到了6龄的老熟幼虫，与已有的幼虫最大龄期报道结果一致，也进一步明确了6龄幼虫在天津的发生时期。第三，观察发现： 5龄和6龄幼虫腹足外侧体壁上的斑块有两种类型，一种个体在毛片区域上有较大黑斑块，另一种个体无斑块，只有微小的黑色毛片，毛片形态与虫体背方毛片相同。

关键词：国槐尺蛾；幼虫； 龄期；毛片；天津

中图分类号：S433.4 文献标识码：A DOI 编码：10.3969/j.issn.1006-6500.2015.07.024

Abstract： In this experiment， the observation on the chaetotaxy and larva stage characteristics of moth Semiothisa cineraria Bremer & Grey was conducted in three aspects. First， the larva's pinaculum was observed. And this morphological characteristic was suggested to be used to recognize the lavae species except those of body color， body surface marks and body length known. Second， the results of larva raising experiment carried out during from middle and late May to middle and late June in 2013 showed that the largest larva stage was six instar and the currency time of the six instar larva in Tianjin was further made sure. Third， it was found that five and six instar stage larvae can be divided into two types according to the marks on their prolegs. One had larger black marks on the pinaculum area of the prolegs， another only had small black pinaculums just same as those on the dorsal side of the larva body.

Key words： Semiothisa cineraria； larva； stadium；pinaculum； Tianjin

槐尺蛾（Semiothisa cineraria Bremer & Grey）幼虫食害林木叶片，每年发生世代数1～5代[1-5]不等。第1代或2代幼虫的防治效果关系到后期危害严重与否。幼虫阶段的3龄[2]或2～3龄期[6]是施药防治的最佳时期。为减少农药污染环境而又能较好地控制幼虫为害，改进施药方法很重要，如进行树干注射药剂防治幼虫[7]以及危害的可持续控制研究[8]等方面的工作在不断进行。当前对幼虫形态识别方面的研究报道主要包括体长、体色、龄期。已报道的末龄或老熟幼虫体长范围有不同，如38～42 mm[1]、45～50 mm[2]及45～55 mm[9]。对老熟幼虫龄期有5龄[10]、6龄[1， 11]两种报道，一些文献报道的末龄幼虫指5龄，而有的文献中的末龄幼虫则为6龄。另外，已报道幼虫体色及斑点类型有不同，如体色分绿色、褐色有或无黑斑[6]，春型和秋型[9]幼虫又具独特类型的斑、纹，但1龄、2龄幼虫的斑纹不明显。……