The fumigant (referred to as smoke agent) is an ideal dosage form for the prevention and control of vegetable pests and diseases in protected areas and the production of pollution-free vegetables. It is recommended to use tobacco agents to control vegetable pests and diseases in protected areas. In order to scientifically and rationally use the smoke agent in the production of vegetable in the protected area, according to the occurrence and damage of the main pests and diseases in the main vegetable producing areas of our county, through the practice test, the prevention and control methods of the tobacco pests in the protected area are summarized. The district applies reference in the development of vegetable industry. 1 Selection of smoke agent: 20% shed fungus smoke agent, 10% smoked smoker, 10% smoked and smoked smoke agent produced by the pesticide development center of the Plant Protection Institute of Gansu Academy of Agricultural Sciences. In the production of protected vegetable, 20% shed fungus can prevent downy mildew, gray mold, leaf mold, early blight, late blight, blight, powdery mildew, anthracnose, black spot, spot blotch, etc. Disease. 10% smoked and smoked smoker can control pests such as aphids, greenhouse whitefly, and Liriomyza (Lepidoptera: Lepidoptera). 10% smog smoker can prevent pests such as spider mites and two-spotted spider mites. 2 Prevention and control period The use of shed bacillus smoker to control vegetable diseases in protected areas is best before or during the early stage of the disease. The peak period of disease occurrence should be controlled by systemic therapeutic agents. The control of aphids, whitefly, leafminer and red spiders should be used in the initial or early stage of pests, and can also be applied at the peak. Only smoke or dust can be used to control pests and diseases when it is raining or raining. 3 Application time It is best to burn from around 6 pm and close the shed overnight, which is beneficial to the deposition of smoke agent particles, improve the control effect, and does not affect the farming operation. 4 Conditions of use Since the smoke agent is used as a carrier for the purpose of application, and the smoke has the characteristics of being easy to float and diffuse, the use of the smoke agent requires strict sealing conditions, the greenhouse cannot be damaged, and the doors and windows should be closed. 5 The method of application is to distribute the smoke point evenly in the crop line between the greenhouses, and set up 5-6 per acre, so that the package of the smoke agent is inclined 45-60 degrees from the ground, and the fire is directly from the bottom. After igniting, blow off the open flame to make it smoke normally. After the point is finished, quickly close the shed to stay overnight, and then ventilate the next morning to perform the farming operation. 6 Dosage According to the area of ​​the greenhouse and the size of the space, the general use of shed bacillus smoker 300--400 grams, smoked smoker 400--500 grams, smoldering smoker 400--500 grams. When using small arch sheds and vegetable seedlings, the dosage should be reduced to avoid phytotoxicity. When pests occur, the dosage should be increased to improve the control effect; the sheds with poor sealing performance should also be appropriately increased to ensure the prevention. effect. 7 The application interval and the number of application times should be applied once every 7-10 days, and the prevention and treatment of diseases should be continued for 3 to 4 times. The control of whitefly, spotted fly and red spider must be used continuously for 2 to 3 times. Control the mites for 1 to 2 times. When the pests and diseases occur seriously, the interval between administrations can be shortened to 5-7 days. 8 Precautions 8.1 Tobacco is a flammable substance. It should be protected from fire, moisture, heat and moisture when stored and transported. Avoid direct sunlight. Store separately. It is strictly forbidden to mix with food, seeds, feed and fertilizer. Bake, should be dried before use. 8.2 After the smoke agent is ignited, the smoke will be quickly released. The application personnel should leave the shed immediately; the smoke point should be more than 30 cm away from the crop and should be kept away from combustibles. 8.3 The smoke agent should not be used in the open field, and the spray should not be diluted. 8.4 Pay attention to labor protection when using, and accidental poisoning should be sent to hospital for emergency treatment immediately.
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