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How to Prevent Pesticide Pollution in Greenhouse Vegetables
1. Select seedlings to reduce the number and opportunities of pests and diseases in greenhouse vegetables, so as to reduce the use of pesticides to reduce pollution; First, we must select seedlings that have undergone stringent quarantine inspections to prevent the spread of harmful pests and weeds. Second, use more resistant varieties and insect-resistant varieties. Again, seeds are soaked in warm soup before seedlings are raised to prevent the spread of pests and diseases through the seeds into the greenhouse. 2. Soil Treatment At present, one of the most economical, effective, and convenient methods is to utilize the high temperature of greenhouses to disinfect the soil: In August each year, when greenhouses are idle, 1500 kg of straw can be applied to every 667 square meters of greenhouses, and calcium can be 30- 60 kg (at pH <6.5 in soil) or ammonium sulfate (30 to 60 kg) (PH ≥ 6.5), then the soil is deep-turned, and then the earth is 60-70 cm in width and 30 cm in height. The abandoned shed film covers the earth and is filled with water in the trenches between the earth until it penetrates the earth. Sealing the greenhouse for more than 7 days can effectively kill various pests and diseases in the soil. 3. Post-emergence control (1) Physical control technologies such as electronic vegetables and insect pests control equipment for shed vegetables. The instruments use a combination of microwave and ozone to kill viruses, bacteria, fungi, and pests on vegetables. The effect is very significant. (2) Use biological pesticide Bt emulsion to control lepidopteran pest larvae; Abamectin pesticides to prevent pests, Liriomyza, Plutella xylostella, Pieris rapae, etc.; Release licorice bee to prevent greenhouse whitefly; Release of seven-spot ladybug Control locusts and so on. (3) Use natural pesticides 1 pepper (more spicy as possible) 0.5 kg, add 50 kg of water and cook for 15 minutes, then add the 0.1 kg of ordinary detergent to the extract, and mix it with 50 kg of water. Use with caution on melons. 2 Add fresh loofah with a small amount of water, smash, and then leave the liquid to the residue, add water to the mother liquor at a ratio of 7:23, then add a small amount of soap, stir and spray, and use with caution the melons and beans. 3 Other prevention methods such as ecological control, agricultural control, etc.
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