桑天牛的发生与防治技术桑天牛又名褐天牛、粒肩天牛。主要为害苹果、桑树、核桃、樱桃、海棠、毛白杨、柳树、榆等多种果树和林木。１为害状况桑天牛初孵幼虫在２～４年生树干中，先向上蛀食１０ｍｍ左右，即回头沿枝干木质部蛀食，逐渐深入心材。幼虫在蛀道中，每隔一定... Mulberry occurrence and prevention and control technology Tian Tian cattle, also known as brown bull, grain shoulders day cow. The main damage to apple, mulberry, walnut, cherry, Begonia, Populus, willow, elm and other fruit trees and trees. 1 damage status mulberry new-born larvae in 2 to 4 years old trunk, the first eaten 10mm or so, that is, back along the branches of the stem xylem eating gradually into the heartwood. Larvae in the tunnel, every certain ...