一、植物病害防治的概念及原则。植物病害防治是要处理好农业生态系中各种因素之间的相互作用,使不发生病害,或使病害所造成的危害性降低到最小限度,而大多数病原物是不可能彻底被消灭的,只能压低数量。并要尽可能减少对环境造成污染,维持生态平衡。为此,防治病害要有全局观点和长远考虑。要核算成本,讲究经济效益。 First, the concept of plant disease prevention and control principles and principles. Prevention and control of plant diseases is to deal with the interaction between various factors in the agro-ecosystem so that no diseases will occur or the harmful effects caused by the diseases will be reduced to a minimum while most of the pathogens can not be completely eliminated , Only to reduce the number. And to minimize pollution to the environment, to maintain ecological balance. To this end, prevention and treatment of diseases should have a global perspective and long-term considerations. To account for costs, pay attention to economic benefits.