桃蛀螟各虫态形态学特征观察

A preliminary observation of the morphological characters of different stages of Conogethes punctiferalis (Guenée)

借助体视显微镜和扫描电镜,观察、记述不同日龄（虫龄）桃蛀螟卵、幼虫、蛹和成虫的形态特征,以及雌、雄蛹的识别方法,详细描述幼虫腹足和气门等局部超微结构,以期为桃蛀螟幼期形态识别和蛹期性别区分提供分类依据.桃蛀螟初产卵乳白色,半透明,随发育成熟其颜色经历黄色、橘红色（或橘黄色）、红色等变化过程,近孵化时呈深红色.初孵幼虫体长2.05 mm,灰白色,随着龄期增大,体色逐渐加深,2龄、3龄、4龄和5龄（老熟）幼虫体长分别为5.13,9.28,13.49,20.67 mm.幼虫腹足趾钩双序环式,气门椭圆形.桃蛀螟蛹长约10.50 mm,初化蛹浅黄色,体躯稍柔软,之后变为橘红色,近羽化时呈深褐色,翅芽上出现明显的豹纹状黑色斑点.雌蛹生殖孔与肛裂缝之间的距离较长,达1.15 mm;雄蛹较短,仅0.15 mm.成虫翅长11.00～12.50 mm,体黄色,翅面有豹纹状黑色斑点25～28个,雄蛾第9腹节具黑色味刷.

In this paper, the morphological characters of eggs and 1-5 instar larvae, as well as different sexual pupae and adults of Conogethes punctiferalis, especially the ultrastructures of abdomen legs and spiracles of larvae, were described and illustrated under a stereoscopic microscope and scanning electron microscope. The eggs are milk-white at the beginning, then turn yellow and red gradually and successively. The length of newly hatched larva is about 2.05 ram, gray white and somewhat reddish; along with the instars increasing, the color is darkened gradually. Larva length of the 2nd instar, 3rd instar, 4th instar and last stage were 5.13 mm, 9.28 mm, 13.49 mm and 20. 67 mm respectively. Crochets of abdomen are biordinal, arranged in a circle. The pupa length is about 10. 50 mm, soft and yellowish at its early stage, then turns orange red, and dark brown near eclosion, Adult is yellow, forewing length 10. 00-11.50 ram, dotted with 25-28 leopard black spots, ninth abdomen with black corema.