在果树上以蚜虫为主的一些刺吸式害虫靠吸食汁液生存,使果树养分遭受损失,促使落叶落果,危害极大。它们吸食过的叶子往往发生卷曲,增加喷药困难,减低除虫效果。这里向果农介绍一种既简便,且成本低而效果又好的主干环涂农 In the fruit tree to aphid-based sucking some pests inhalation juice to survive, so that loss of nutrients in fruit trees to promote deciduous, the great harm. They tend to curly leaves that have been smoked, increasing spraying difficulties, and reducing de-worming effects. Here to introduce a simple and easy to farmers, and low cost and good effect of the trunk ring coated agriculture