云斑天牛,俗称“铁牛”,属鞘翅目天牛科。是杨树的主要害虫之一。近年来,该虫对核桃树的危害日趋严重。据调查重灾区危害株率达到30～60％。 为害情况 云斑天牛以幼虫蛀食核桃树的树干穿食为害,形成树干刻槽、室,截断营养运输通道,使木材失去工艺价值,同时引起黑水病等病害的发生。成虫羽化后,以啃食核桃新梢皮层、叶柄、果柄 Spotted day cow, commonly known as “iron cow”, is a Coleoptera Cerambycidae. It is one of the main pests of poplar. In recent years, the pest damage to the walnut tree is more serious. According to the survey harms harms hit rate of 30 to 60%. Harmful conditions Spotted beetle larvae walnut tree trunks infestation damage, the formation of trunk grooves, rooms, truncated nutrient transport channels, so that the loss of timber technology value, while causing black water disease and other diseases. After the emergence of adults, eating nectar walnut shoots cortex, petiole, fruit stalk