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棉红铃虫４龄漫行期滞育幼虫中后胸背板表皮高度皱缩，由外向内呈明暗相间的抛物线型片层结构；非滞育幼虫表皮不皱缩，呈明暗相间的直线型片层结构。漫行期滞育幼虫雌雄个体表皮厚度无明显差异，分别为２７．８９μ和２３．７５μ，是非滞育型幼虫对应性别的３．０１倍和２．８８倍。而表皮的致密程度在不同虫态和性别之间均无明显差异。说明表皮增厚引起的穿透速率降低是漫行期滞育幼虫耐药性高于非滞育幼虫的原因之一，但耐药性的性别差异与雌雄个体的表皮结构关系不大
In the fourth instar larvae of cotton bollworm, the epidermis of midrib thoracodorsal was highly shrunken, and parabolic lamellar structure of light and dark was observed from outside to inside. The non-diapause larval epidermis did not shrink, Lamellar structure. There was no significant difference in the epidermal thickness of the male and female diapause larvae during the adventitious period, which were respectively 27.89μ and 23.75μ, which were 3.01 times and 2.88 times that of the non-diapause larvae respectively. The density of the epidermis in different stages and gender were no significant differences. These results suggest that the decrease of penetration rate caused by epidermal thickening is one of the reasons why diapause larvae are more resistant to non-diapause larvae in diffuse phase, but the gender differences in drug resistance have little to do with the epidermal structure of both sexes