Selection of pesticides vegetables, fruits, tea and other pesticide residues exceeded if a key ring. The current market demand for pollution-free products is growing, and the production of pollution-free agricultural products requires the use of pollution-free pesticides. The so-called pollution-free pesticides refer to the low dosage, good control effect, low toxicity or non-toxicity to human and livestock and various beneficial organisms. It is easy to decompose in the external environment, and does not cause high efficiency, low toxicity and low residue to the environment and agricultural products. pesticide. In production, farmers' friends can use some simple and common raw materials to prepare their own pollution-free pesticides. The preparation methods of several pollution-free pesticides are described below. Pesticide preparation The bodies of cabbage caterpillars, armyworms, cotton bollworms and ground tigers were collected and smashed into pulp. Add a small amount per 100 grams of worm powder, soak for 24 hours, filter out the insect liquid, and then add 50 kg of water, add 50 grams of washing powder and mix well to form a liquid. The use of these liquids to control similar pests, the kill rate can reach more than 90%. Leaf preparation 1.5 kg of fresh bitter eucalyptus leaves are smashed and added with 1.5 kg of water. After filtration, the slag is added. 40 kg of water per kg of juice is added to control cabbage caterpillars and rapeseed meal. Use 1 part of eucalyptus leaves and add 3 kg of water, soak for 1-2 days, filter the water immersion liquid and spray it, and control aphids, cabbage caterpillars, etc. Pigeon manure preparation 1 kg of pigeon manure plus 10 kg of water, sealed in a barrel or in a cylinder for 15-20 days. Stir well during use, and apply it to the roots of melons, which can not only control the tigers, but also topdress the crops. The garlic and onion preparations were mixed with 20 g of garlic and onion, wrapped in gauze, and soaked in 10 kg of water for 24 hours. This liquid can effectively prevent beetles, mites and red spiders. Grass ash preparation 10 kg of grass ash per acre is immersed in 50 kg of water for 24 hours, and the filtrate is sprayed to effectively control aphids and yellow stalks. If onions, garlic, and leeks are harmed by fly and onion, they can apply or apply 20-30 kg of ash per acre, which is both anti-mite and yield-increasing. Wheat bran preparation First fry 5 kg of wheat bran and cool for later use. Stir 90% crystal trichlorfon 130-150 grams, 250 grams of white sugar, 50 grams of white wine and 5 kilograms of warm water, then pour the cooled wheat bran into the prepared mixture and mix well. In the evening on a sunny day, the pesticide is sprinkled between the vegetable rows and the roots of the seedlings to control underground pests such as crickets and tigers. The baking soda preparation can control the powdery mildew of cucumber and cabbage, powdery mildew, downy mildew and cowpea gray mold by using 0.2% baking soda solution. Potassium permanganate preparation Using 0.2% potassium permanganate dilution solution can prevent powdery mildew of melons, usually spray once every 5-6 days, even spray 2-3 times, the effect is not worse than powder rust. After the eggplant is transplanted, it can be treated with 800 times potassium permanganate solution to prevent the disease of the eggplant. Magnetic Balls,5mm Magnetic Balls,Magic Magnetic Balls Ningbo Hegao Magnetic Technology Co.,Ltd , http://www.allmagnetstores.com