植物性土农药是利用植物的茎叶经过简单加工而制作的农药。它具有原料广、成本低、方法简、无污染、既能灭虫又能除病。对人、畜安全等优点。现介绍几种经过广泛实践证明效果较好的土农药的制作与作用方法。(1)大蒜水。将大蒜1公斤捣烂,加水10公斤,搅拌后过滤,喷洒或灌根,能抑制瘟病,棉花立枯病,小麦锈病和土豆腐烂病。(2)烟草粉。将烟草磨 Botanical soil pesticide is the use of plant stems and leaves through simple processing and production of pesticides. It has wide raw materials, low cost, simple method, no pollution, both pest control and disease removal. On the people, livestock safety and so on. Now introduce several kinds of soil pesticides that have been proved to be effective through extensive practice. (1) Garlic water. The garlic 1 kg smashed, add water 10 kg, filtered after mixing, spraying or irrigation, can inhibit the blast, cotton blight, wheat rust and potato rot disease. (2) tobacco powder. Tobacco mill