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防治害虫的方法很多,已采用的有化学防治、生物防治、农业防治和物理防治等,其中以化学防治的应用最为广泛。诚然,当害虫大发生时,采用化学防治确有十分显著的急救作用,是当前防治害虫的一项最重要措施。但化学防治也还有其弱点,例如药剂的供应、药效的高低、植物的药害、天敌的被杀伤、害虫的抗药性、防治的时机和劳力的安排等等,都或多或少还存在一定问题,甚或在某种程度上严重影响治虫工作的开展或防治效果的提高。 比较完善的防治害虫措施,必须采用综合防治的办法,其中农业防治是重要内容之一。农业防治是在有利于增产的前提下,全面考虑农业八字宪法八个字间的相互依存和相互制约的关系,通过各项增产措施,有意识的抑制或减轻害虫发生。农业防治涉及到经营方式、栽培制度、管理措施、品种、作物布局和有计划的改造自然环境等一系列复杂的问题,在分散的个体经
Many ways to control pests have been used in chemical control, biological control, agricultural control and physical control, chemical control in which the most widely used. It is true that when pests occur in large quantities, the use of chemical control does have a very significant first aid effect and is currently one of the most important measures for pest control. However, chemical control also has its weaknesses, such as the supply of medicine, the level of efficacy, the phytotoxicity of plants, the killing of natural enemies, the resistance of pests, the timing of prevention and control of labor, etc., all more or less also There are some problems, or even to a certain extent, seriously affect the development of pest control or prevention and treatment of the increase. Relatively perfect pest control measures must adopt a comprehensive approach to prevention and control, of which agricultural prevention and control is one of the important contents. Under the precondition of being favorable to increasing output, agricultural prevention and control fully consider the interdependence and mutual restraint relations among the eight characters of the agricultural character constitution and consciously inhibit or reduce the occurrence of pests through various stimulation measures. Agricultural control involves a series of complex issues such as management mode, planting system, management measures, varieties, crop layout and planned natural environment transformation.