一忌中午用药 中午用药是错误的。因为中午温度高,水分蒸发量大,用药的浓度相对提高,虽然防治效果好些,但树体很容易产生药害、昆虫产生抗性和造成喷药者中毒,因此不易提倡。 二忌盲目用药 果园用药一定要有针对性、选择性,哪种药剂防治哪种病虫效果好就采用哪种药剂,即对症下药。如防治红蜘蛛必须用杀螨剂;防治蚜虫最好用内吸剂等,切忌无选择盲目用药,而且必须依据预测预报,达到防治虫口密度或病情指数后再用药,并不是见虫就打见病就治。达不到虫口密度构 Avoid noon Medication medication is wrong at noon. Because noon temperature is high, the amount of water evaporation, the relative increase in the concentration of the drug, although the control effect is better, but the tree is easy to produce phytotoxicity, insect resistance and cause spray poisoning, it is not easy to promote. Second, avoid blind medication Orchard medication must be targeted, selective, which kind of pesticide which kind of pesticide control effect is good, that is, the right medicine. Such as the prevention and treatment of red spider must use acaricide; prevention and treatment of aphids is best to use the endosulfan, should not choose blind medication, and must be based on the forecast, to control the population density or disease index before medication, not to see the worm to see Ill treatment. Insect population density structure