黄带犀猎蝽形态特征

为了更好地保护和利用草地贪夜蛾的捕食性天敌黄带犀猎蝽,利用体视镜对其各虫态的形态特征进行了观察。结果表明:黄带犀猎蝽卵粒为长圆桶形,褐色,顶端卵盖喇叭口状,底部附着片状胶质物,卵块蜂窝状。1~2龄若虫橘红色,无翅芽或不明显;3~4龄若虫橘红色或深橘红色,前翅芽黑色,后翅芽暗红色;5龄若虫深褐色,前后翅芽均黑褐色。成虫黑色,体被黑色微绒毛,前翅革片端半部及膜片基部淡黄色或黄白色;小盾片上部的粗刺顶端呈二分叉状;腹部气门淡黄色或褐色,内侧有白色绒毛圆斑;足黑色,多细毛。黄带犀猎蝽雄虫腹面节间前凸,呈钝角脊状,腹部末端呈圆钝凸起,而雌虫腹部腹面节间较平缓,腹部末端平滑。通过描述该天敌的形态特征,可为该天敌的保护和扩繁提供参考,并为利用该天敌对草地贪夜蛾绿色防控提供依据。

Morphological characteristics of Sycanus croceovittatus Dohrn

In order to protect and use the predatory natural enemies of Spodoptera frugiperda, Sycanus croceovittatus, we used stereoscopes to observe the morphological characteristics of S. croceovittatus. The results showed that the egg is cylindrical in shape, brown, and the operculum in apical potion is bell-shaped, attached to the sheet of colloid on the bottom, and the egg mass is in the shape of honeycomb. The 1-2 instar nymphs are orange-red with no wing bud or not obvious. The 3-4 instar nymphs are orange-red or deeply orange-red with the black forewing bud and darkly red the hind wing bud. The 5th instar nymphs are deeply dark brown with the darkly brown wing bud. The adult of S. croceovittatus is black, and the body is covered with black setae, and the apical half of forewing corium and the base of the diaphragm are yellowish or yellow white. There is a furcate spine on the scutellum. The abdomen stigmata is yellowish or brown with white patches of setae, and legs are black with thick setae. The male internodes of S. croceovittatus are convex with obtuse ridge, and the ends of the abdomen are blunt, while those of the female are flat. By describing the morphological characteristics of the natural enemies, the results lay the foundation for the reproduction and population protection of this nature enemy, and provide a basis for better control against S. frugiperda.