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1958年各地发掘利用的土农药,有90％以上是植物,品种繁多,成分复杂,一般除含有生物硷、甙类、鞣质、挥发油、树脂等等外,还有很多成分不大明暸。这些成分对防治病虫害起着不同的作用。 各种植物常因生长和发育时期的不同,所含的成分也是高低不同,即在同一天内,早晚所含的成分也是高低不一样。植物性农药,随采、随制、随用,尚无问题,
In 1958, more than 90% of soil and pesticides were discovered and utilized in the area. There are a large variety of plants and complicated ingredients. In addition to containing alkaloids, glycosides, tannins, volatile oils, resins, etc., there are many components that are not clear. These ingredients play a different role in pest control. A variety of plants often due to different growth and developmental stages, contained in the composition is different, that is, the same day, sooner or later, the composition is not the same level. Botanical pesticides, with mining, with the system, with the use, there is no problem,