With the enhancement of people’s concept of health, the demand for pollution-free agricultural products is getting higher and higher. People pay more attention to the problem of pesticide residues. The artificially-prepared pollution-free “tertiary pesticides†are effective in preventing and controlling diseases and insect pests, are low in cost, and are simple to produce. Harmless, it can be described as more than one thing. Now introduce some commonly used soil pesticide formulations "grass square." Mulberry leaves: 1 kg of mulberry leaves, 5 kg of water, boiled for 1 hour, and filtered. The filtrate was sprayed in a 1:4 ratio and sprayed to effectively control red spiders. Castor Leaf: The dry castor leaf is crushed into fine powder, and mixed with soil miscellaneous fertilizer in a certain proportion and spread to the ground, which can effectively prevent and control underground pests such as ground tigers, earthworms and earthworms. Masson pine solution: Add 5 kg of boiled water to 5 kg of Pinus massoniana L. and immerse it in closed air for 2 hours to filter and spray it. This can prevent fly locust and leafhopper pests. A 30-fold aqueous extract of pine needles can inhibit spore germination of late blight. Peach leaf solution: Take 5 kg of fresh peach leaves, 100 grams of quick lime, soaked in 3 times clean water for 5 hours, and squeeze the dried leaves of peach leaves to the residue and serve as the original liquid. 10 kilograms of water per kilogram of raw water plus water is used to control aphids, red spiders and other pests, and has good results. Insect preparations: Collect cabbage pests, ground tigers, and other pests in the vegetable garden and smash them into pulp. After soaking for 50 grams per 100 grams of water, filter out the residue and add 50 kg of water. Add a small amount of washing powder and stir evenly. For vegetables that are attacked by similar insect pests, they are deterred by the smell and the insects refuse to eat. The kill rate can reach more than 50%. "Sugar cannonball": 0.5 kg of brown sugar, 1 kg of vinegar, 10 kg of water, mixing and stirring, and then adding appropriate amount of pesticides, and the number of pots placed in the vegetable fields. Adults such as cabbage caterpillars are extremely attractive. Reduce larval damage. Potassium permanganate: Soaking sprays are used multiple times. With a 0.2% potassium permanganate dilution solution, after soaking for 20 minutes, washing with clean water can kill pathogenic bacteria carried by the seeds and reduce pathogenic bacteria in later stages. 600-1000 times potassium permanganate solution spray, every 5-6 days spray 1, even spray 2-3 times, can effectively control melon powdery mildew and crop seedling damping off, root rot. Baking soda solution: Spraying with 0.2% baking soda solution (100 grams of baking soda and 50 kg of water), the control effect on cucumber, cabbage powdery mildew, anthracnose, downy mildew, and gray mold is also obvious. China Agricultural Network Editor
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