现在常用的农药主要分为杀菌剂、杀虫剂、除草剂、灭鼠剂等。杀菌剂用来治病,如敌锈钠主要用来防治锈病,而杀虫剂对锈病就无效,如用辛硫磷防治锈病,就没有任何作用。在同一类型农药中,每一种农药都有特定的防治范围,如杀螟松对菜蚜、菜螟有作用,对小麦红蜘蛛就没有作用。因此,选用农药时要看防治对象,做到有的放矢,对症下药。 Now commonly used pesticides are divided into fungicides, pesticides, herbicides, rodenticides and so on. Bactericides used to treat diseases, such as sodium rust rust is mainly used to control rust, and pesticides on the rust is invalid, such as the use of phoxim prevention rust, there is no effect. In the same type of pesticides, each pesticide has a specific range of prevention and treatment, such as fenitroth have a role on the cabbage aphids, cabbage stem borer, on the red spider wheat has no effect. Therefore, the selection of pesticides depends on the object of prevention, to be targeted, the right medicine.