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杨园蚧(Quadraspidiotus gigas Thiena et Gerneck)属盾蚧科。发生于新疆、甘肃、青海、宁夏、陕西、山西、内蒙以及东北西部,系国内林木检疫对象之一。在晋北主要危害小叶杨、小黑杨。虫体固定在枝、干上,以口器刺入树皮内吸取汁液。因其逐年繁殖,新旧介壳重叠密布整个树干,每平方厘米最高达104个,使树木长势逐渐衰弱,终至秃顶干枯,造成单株或成片林木死亡。1978—1980年,我们在平鲁县井坪梁林场对该虫进行了室内外观察及防治试验,现
Quadrantpidiotus gigas Thiena et Gerneck is a member of the Dendrocalamus family. Occurred in Xinjiang, Gansu, Qinghai, Ningxia, Shaanxi, Shanxi, Inner Mongolia and the western part of Northeast China, one of the objects of domestic forest quarantine. Major hazards in northern Shanxi poplar, black poplar. Insects fixed in the branches, dry, with mouthparts into the bark to draw juice. Because of its annual breeding, the old and new shells overlap the entire trunk, up to 104 per square centimeter, so that the trees gradually weakened, and finally bald dry, causing single or into pieces of forest death. From 1978 to 1980, we conducted indoor and outdoor observation and control experiments on this pest in Jingpinglou Forest Farm, Pinglu County.