几年来,我们连续在桃树上采取人工捉拿红颈天牛的方法,效果十分显著,其关键在于掌握捉拿适期. 经观察发现,每年“五一”前后,为幼虫大量为害期,此时大多数幼虫正在蛀食皮层,尚末深达木质部,排出的粪便为褐色;只有少数老幼虫已蛀食木质部,粪便黄白色。因此根据粪便颜色也可判辨 Over the past few years, we have been in a row peach trees to capture the method of artificial hunting Red-necked Beef, the effect is very significant, the key is to grasp the arrest period. The observation found that each year before the “May Day” for the large number of larvae damage, this time Most larvae are eaten in the cortex, yet reach the xylem, excreting brown excrement; only a few old larvae have eaten xylem, excrement yellow-white. Therefore, according to the color of faeces can be judged