1蛀干害虫的种类与危害1.1蛀干害虫的种类危害杨树的蛀干害虫以青杨天牛、白杨透翅蛾、杨干象甲三种发生面积大、危害严重。1.2蛀干危害状识别要点1.2.1青杨天牛以幼虫蛀食嫩枝、主干韧皮部,侵入部位在两叶芽之间,危害枝干的粗度约0.5cm,使树木养分受阻,幼树被害处组织增生,形成纺锤状、糖葫芦串状瘿瘤,致使枝梢干枯,易于风 1 Types and Harm of Boring Pests 1.1 Types of Boring Pests Harmful to pests of poplar, the pests of Poplar, Populus euphratica and Populus euphratica occur in large area. 1.2 Boring hazard identification 1.2.1 Qingyang celastrus to larvae edible shoots, trunk phloem, invaded parts between the two buds, the harm stems of the thickness of about 0.5cm, so that the tree nutrient obstruction, the saplings of tissue damage Proliferation, the formation of spindle-shaped, candied gourd string nodules, resulting in dry branches, easy to wind