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防治树木病虫害常用树冠喷药法,由于树冠高大,树叶浓密,不仅作业困难,而且难以喷匀喷透,防治效果往往不够理想。如果采用树干包扎农药法,其药液可渗透到木质部导管内,并扩散到蒸腾液流中均匀地输导到树冠树叶上,从而可以防治树冠和树干上的病虫害,与喷药相比具有省工、省药、污染少、效率高的优点。现介绍其技术要点,供参考。 一、适应对象 适用于果树和林木的蚜虫、红蜘蛛、介壳虫、锈壁虱、天牛、吉丁虫等食叶、吸汁、蛀干害虫和褐斑病、轮纹病、烟煤病等侵染性病害以及缺素症的防治。 二、扎药时间 从春季树液开始流动至冬季树木休眼前均可进行,但以4—9月效果较好。一般药液在树体内每天可向上移动1米左右,故具体扎药时间必须比喷药适期前数天。 三、农药选配 必须依害虫和病原种类选用良好防效,溶
Prevention and control of tree pests commonly used crown spray method, due to tall canopy, thick leaves, not only difficult operation, but also difficult to spray evenly spray, the control effect is often less than ideal. If the trunk bandage pesticide law, the liquid can penetrate into the xylem catheter, and spread to the transpiration flow evenly to the canopy of the leaves, which can prevent the crown and trunk pests and diseases, compared with spraying with the provincial Workers, provincial medicine, less pollution, high efficiency advantages. Now introduce its technical points for reference. First, to adapt to the object Suitable for fruit trees and trees aphids, spider mites, scale insects, rust ticks, beetles, jylintin and other leaves, Suction, pest and brown spots, ring rot disease, bituminous coal disease and other invasion Staining disease and the prevention and treatment of deficiency. Second, the time from the beginning of sap flow of spring sap flow to the winter before the tree can be carried out, but to 4 to 9 months better. General liquid in the tree can move up to 1 meter a day or so, so the specific dressing time must be sprayed than the appropriate period of days before. Third, pesticide selection must be based on species of pests and pathogenic good control effect, soluble