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甜菜夜蛾是为害芦笋茎叶的主要害虫。我们从1987年开始对该虫进行了初步调查和饲养观察,现报道如下: 一、形态特征 1. 成虫 体长 13～17毫米,翅展25～28毫米,前翅灰褐色至灰黑色,中央有一灰黄色的圆形斑纹和一浅灰色肾状纹,纹周围有浅褐色波纹,靠外缘有一排由8个小黑点组成的外缘线,后翅白色,边缘褐色。 2、卵 扁球形,外表有放射状纵隆起线。卵粒直径约0.6～0.7毫米,厚0.35～0.5毫米,一次几粒至几十粒成块,卵块上有一层银灰色松软的绒毛。卵初产时呈乳黄色,后变黄绿色,孵化前呈灰绿色。
Beet armyworm is the main pests that damage the stems and leaves of asparagus. We started from 1987 on the pest conducted a preliminary investigation and feeding observations are reported as follows: First, the morphological characteristics 1 adult body length of 13 to 17 mm, wingspan 25 to 28 mm, wings gray brown to gray-black, the central one Gray-yellow roundish markings and a light gray kidney-shaped markings with light brown ripples on the periphery, a row of outer edges consisting of 8 small black spots on the outer margin, a white hind wing and a brown margin. 2, oval flat ball, the appearance of a radial uplift line. Ovum diameter of about 0.6 to 0.7 mm, thickness 0.35 to 0.5 mm, a few grains to dozens of pieces into a block, the egg has a layer of silvery soft fluff. Eggs were milk yellow when primiparous, yellow-green after hatching before the gray-green.