我们经多年试验,摸索出注干防治桃蚜新法,效果很好。现介绍如下。 1.时间。最好掌握在4月上旬至5月上旬,越冬代蚜虫已开始大量繁殖,树体有少量新梢叶片受害轻微卷曲,但尚未形成危害之前进行防治。受害严重的桃园在生长季节的其它时间亦町进行。 2.方法。用锥、钉等尖锐铁器,在树干距地面 After years of testing, we found out that the new method of preventing and controlling Myzus persicae is good and effective. Now introduced as follows. Time It is best to master the early April to early May, overwintering aphids have begun to bloom in large quantities, the tree a small amount of shoot tip leaves slightly curled, but not before the formation of hazards prevention and control. The hardest-hit Taoyuan is also machined at other times during the growing season. Method. With cone, nail and other sharp iron, the trunk from the ground