In recent years, some farmers have used homemade soil pesticides to prevent disease, which not only reduces production costs, but also reduces the pollution of crops and is safe to humans. Here are several methods for the production and use of soil pesticides that have proven to be effective: Garlic water mashes 1 kg of garlic, adds 10 kg of water, stirs and filters, and takes the filtrate for spraying or irrigating roots, which can inhibit a variety of Chinese herbal medicines. Spot, Blight, Atractylodes rust, and Fritillaria spp. The bitter buckwheat leaves will be chopped with fresh buckwheat leaves for half a day, add water, leaf to water ratio of 1:2, boil for 50 minutes, filter, and add 0.3% detergent or soap to the filtrate. When it is used, it is supplemented with water 1 times to control pests such as Ginkgo biloba, peony, peony, etc. After the leaves are dried and crushed, 10-15 kilograms per mu can be used to control underground pests such as cockroaches and golden needles. Tobacco powder ground tobacco into fine powder, and add 3-6 kilograms of grass ash per kilogram to mix evenly. Before the dew is still dry in the morning, it can be used to control locusts, leafhoppers, leaf miners and caterpillars. Mulberry leaves 1 kg of mulberry leaves, add 5 kg boiled water and filter for 1 hour. The filtrate was sprayed at a ratio of 1:4 and sprayed to effectively control red spiders. The castor leaves grind dry ramie leaves into fine powder and mix it with soil fertilizer in a certain proportion and spread it to the ground. This can effectively prevent and control underground pests such as tigers, earthworms and earthworms. Pinus massoniana with 5 kilograms of pine needles plus 5 kg of boiled water, sealed and soaked for 2 hours, filtered and sprayed, can prevent planthoppers and leafhoppers. A 30-fold aqueous extract of pine needles can inhibit the spore germination of the late blight pathogen. Peach leaf solution takes 5 kg of fresh peach leaves, 100 g of quick lime, and is soaked in 3 times of clean water for 5 hours. The peach leaves are dried and slag-dried, and the original liquid is prepared. 10 kg spray of clear water per kilogram of liquid is used to treat locusts, red spiders and other pests, and has good results.