果园、菜园及大田作物常常遭受多种病虫危害,有时几种病虫同时发生。如分别用药,不仅浪费人力物力,还可能贻误防治适期。为此,需要找出主次病虫,根据一次用药兼治多种病虫的原则,采取混用兼治的办法,达到防治的目的。一、混用的好处1.混用可以使药剂之间取长补短,节省时间和劳? Orchards, vegetable gardens and field crops often suffer from many pests and diseases, and sometimes several diseases and pests occur simultaneously. Such as medication, respectively, not only a waste of manpower and resources, but also delaying the appropriate period of prevention and control. To do this, we need to find out the primary and secondary pests and diseases. According to the principle of treating both pests and diseases once and for all, we should adopt a mix-and-match approach to achieve the goal of prevention and control. First, the benefits of mixing 1. Mixing can make up for each other to save time and labor?