在进行茶园治虫防病时,常强调使用经济有效低浓度。所谓经济有效低浓度,是指在正常情况下。既能保证90％左右的防治效果,又能使农药的不良付作用降低到低限度。这个经济有效低浓度,要经过多次科学试验才能确定。所以在使用农药时,应按照使用说明书或有关研完单位提出的防治某种对象的经济有效低浓度去使用,不要任意提高使用浓 In the prevention and control of tea plant pest control, often emphasize the use of cost-effective low concentration. The so-called low-cost effective concentration, is under normal circumstances. Both to ensure that about 90% of the control effect, but also to reduce the adverse effects of pesticides to the lower limit. This cost-effective low concentration, to go through many scientific experiments to determine. Therefore, when using pesticides, should be used in accordance with the instructions for use or research institutes put forward to control the cost of a certain object of low concentrations to use, do not arbitrarily increase the use of concentrated