1976年从以来,我们对舞毒蛾(Ocneria dispar L.)和苹毒蛾(DasychiraPudibunda L.)的两种核型多角体病毒病进行了初步的观察。两虫均属鳞翅目,毒蛾科。食性很杂,是重要的园林树木害虫。舞毒蛾广泛分布于我国各地。苹毒蛾主要分布于我国华北、东北等地区。在沈阳市这两种害虫均普遍发生,其中尤以舞毒蛾为害较重。去秋我们首先在公园、苗圃的林地内,发现苹毒蛾老龄幼虫大量死亡。又于今年4月下旬,发现在室内饲养的3—4龄舞毒蛾幼虫大量死亡。发病幼虫,虫体均呈现痈肿、色亮,表现迟钝,不取食。其死亡形态,苹毒蛾幼虫多爬到树冠的上半部,以腹足附着于枝条或叶片上,呈倒“V”字型悬挂,或以尾足附着于枝、叶上倒挂。舞毒蛾在室内饲养的条件下,幼虫也以腹足或尾足附着于饲养箱壁或枝、叶上呈倒“V”字型或倒挂死亡。死亡后的幼虫,体节拉长,体色逐渐变深,体壁极易破裂,流出淡黄或浓稠 Since 1976, we have conducted a preliminary observation of two nuclear polyhedrosis virus diseases of Ocneria dispar L. and Dasychira Pudibunda L. Two insects are Lepidoptera, poison moths. Food is very complex, is an important garden tree pests. Gypsy moths are widely distributed throughout China. Gypsy moths are mainly distributed in North China, Northeast China and other regions. These two kinds of pests are common in Shenyang City, especially Gypsy moth damage. To the autumn we first in the park, nursery woodland, found moth larvae large number of deaths. In late April of this year, a large number of larvae of Gypsy moth larvae aged 3-4 were found indoors. Disease larvae, parasites showed swollen, color bright, slow performance, do not feed. Its death pattern, moth larvae climbed to the upper half of the crown, with gastropod attached to the branches or leaves, was inverted “V” -shaped hanging, or tail foot attached to the branches, the leaves upside down. Gypsy moths under indoor feeding conditions, the larvae also attached to the gastropod or tail foot on the wall or branches of the feeder, the leaves were inverted “V” shape or death upside down. The larvae after death, elongated body, body color becomes darker, the body wall is very easy to rupture, out of light yellow or thick