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植物保护是防治农、林作物病虫害,保证丰产、稳产的有效途径之一,所以“农业八字宪法”列有“保”字,其中包括人工、化学、物理、农业、生物、法规(植物检疫)等防治方法。而生物防治是常被采用的方法之一,效果有时很显著,如利用天然界益兽、益鸟、天敌昆虫(包括捕食性昆虫、寄生蜂、寄生蝇等)、线虫及微生物等。用以防治的微生物有病毒、细菌、真菌及原生动物等。每种害虫在自然界中都有不少的微生物天敌,同它们生在一处,互相制约,造成“自然平衡”的局面。其中牵涉内在、外在因子很多,有自然的力量,也有人为的力量;有生物因素,也有非生物因素;而气候因子与它们的关系最为密切。毛主席在《实践论》中
Plant protection is one of the effective ways to prevent pests and diseases in agriculture and forest crops and ensure high yield and stable yield. Therefore, the word “Bao” is listed in the “Characterization of Agriculture”, which includes artificial, chemical, physical, agricultural, biological and legal (phytosanitary) Other methods of prevention and treatment. Biological control is one of the most commonly used methods, sometimes with significant effects such as the use of natural world beasts, beneficial birds, natural enemies of insects (including predatory insects, parasitic wasps, parasitic flies, etc.), nematodes and microorganisms. The microorganisms used to control have viruses, bacteria, fungi and protozoa. Each pest has a lot of natural enemies of microorganisms in nature, living with them in one place, restricting each other, resulting in a “natural balance” situation. There are many intrinsic and extrinsic factors, natural forces and man-made forces. There are biological and non-biological factors. The climatic factors are most closely related to them. Chairman Mao is in “Theory of Practice.”