目前,一些果农因喷药不当,烧伤了果树的大量叶片、嫩梢,使果面产生了药锈,既影响了果树生长,又降低了果品的商品价值。为防止和减少这些现象的发生,果农们应特别注意以下几点:一、在喷施农药时,要根据果树病虫害的不同以及不同果树对农药的敏感性的差异等,有的放矢,对症用药。如核果类、猕猴桃对敌百虫、敌敌畏很敏感;猕猴桃对乐果特别敏感;葡萄、李、桃的幼嫩组织对多量式的波尔多液很敏感等,如果 At present, some farmers because of improper spraying, burned a large number of fruit trees leaves, tender shoots, so that the fruit rust, not only affects the growth of fruit trees, but also reduces the value of the commodity of fruit. In order to prevent and reduce the occurrence of these phenomena, farmers should pay special attention to the following points: First, spray pesticides, according to the different pests and diseases of fruit trees and insects on the sensitivity of different pesticide differences, targeted, symptomatic medication. Such as stone fruit, kiwifruit is very sensitive to trichlorfon and dichlorvos; kiwifruit is particularly sensitive to dimethoate; young tissues of grape, plum and peach are very sensitive to large amount of Bordeaux mixture, etc. If