The pollution of vegetables mainly comes from pesticides. The size of pesticide residues and residues is closely related to the type of pesticides and the application technology. Preventing vegetable pollution mainly starts from the following aspects:
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Selection of microbial pesticides
Microbial pesticides are living preparations that have no pollution or residue on vegetables. Its types are: Agricultural anti-120, killing bacillus, insects, BT emulsion, Jinggangmycin, streptomycin, Beauveria bassiana. For example, 100-150 grams of BT emulsion per mu can be used to spray 50 kilograms of water to control pests of cabbage caterpillar, diamondback moth, and Spodoptera litura. Spraying with Jinggangmycin 800 to 1000 times has a high curative effect on eggplant bacterial wilt and damping-off. With 100 ~ 200ppm agricultural resistance 120 can prevent melons downy mildew, leaf spot and other diseases.
Use soil pesticides wherever possible
Soil pesticides have a wide range of sources, they are simple to produce, and they are effective in preventing and controlling diseases and insect pests, and they have no side effects. Such as urine washing mixture (600 ~ 800 times liquid detergent powder and a small amount of urea) and tobacco lime water control aphids, red beetles, white fungus, etc., the effect of more than 85%. Spraying 1% ammonium bicarbonate water can prevent cucumber downy mildew; spraying 2% baking soda can prevent melon powdery mildew. Spraying 2% to 3% of superphosphate solution can prevent cotton aphids and tobacco budworm on green peppers.
Rational use of chemical pesticides
The first is to prohibit the use of highly toxic, high-residue chemical pesticides. Such as methamidophos, carbofuran, 1605, 1059, toxaphene and so on. The second is symptomatic use of low-toxicity, low-residue pesticides. The Ministry of Agriculture recommends: 25% of dimehypo, 95% of crystal trichlorfon, 40% of dimethoate, 50% of phoxim, 70% of ketek, 35% of marathon, 50% of rumor, 20% of extinction Insecticide, 25% deltamethrin, 20% insecticidal, 50% carbendazim, 70% thiophanate, 65% dexcon, 70% chlorothalonil, 25% tebucillin, 40% trifluralin , 48% cable, 10% glyphosate, Bordeaux fluid and so on. The third is to strictly control the concentration and number of chemical pesticides used to ensure safety intervals. 
