In the greenhouse, the use of pharmaceutical smoke method to control pests and diseases, has the advantages of labor saving, high efficiency, and does not increase the humidity in the greenhouse. After entering the autumn and winter, the greenhouse must be closed to keep warm at night, which provides conditions for the smoke in the greenhouse. Many vegetable farmers use the smoke agent to control the pests and diseases in the greenhouse. In a survey conducted by technical personnel of the Beijing Plant Protection Station, it was found that some vegetable farmers did not use the greenhouse gas smoke correctly, resulting in the emergence of problems such as phytotoxicity or poor drug efficacy. In view of this situation, here we introduce the correct use of greenhouse smoke and precautions to help farmers master the greenhouse smoke technology.

How to use: Before using the smoke agent, all the vents in the greenhouse need to be closed so that the greenhouse is in a confined state. The smoke agent is placed on the walkway in the shed, and the smoke agent is closed to close the exit of the greenhouse. In the evening, the operator can close the booth after igniting the smoke agent, so that the booth can be closed all night to ensure that the fine smoke particles are evenly distributed in the booth.

Matters needing attention: 1. Purchase the smoke agent from the formal channel, avoid using the counterfeit unqualified product to cause the production loss. 2. According to the area of ​​the greenhouse and the use of instructions to select the appropriate dose, avoid random additives, so as not to cause injury. 3. Because the soot particles have a thermally induced migration, that is, the phenomenon that the soot particles can be repelled by a hot object and deposited on a cold object. Therefore, the tobacco should be smoked in the evening or early in the morning when the temperature of the plant leaves is low. This will facilitate the accumulation of smoke particles in the leaves. It is convenient to use in the evening, and the best effect is to avoid emitting smoke when it is in direct sunlight at sunny noon. 4. The smoke agent is easy to flow. Once the hole in the shed has appeared, the temperature in the shed is higher than that in the outside world. The smoke particles will flow out of the shed outside the shed and affect the efficacy. Therefore, before exhausting the smoke agent, it is necessary to carefully inspect the tightness of the booth, and to close the doors and windows of the booth after burning the smoke agent. 5. In the process of smoked tobacco used in greenhouses, smoke emitted from the smoker will produce harmful gases such as CO, HCL, SO2, and NO. When the limits of the tolerance of the plant are exceeded, it will lead to accidents. Therefore, after using the smoking method, it is not possible to close the booth for a long time. After 8 to 12 hours, it is necessary to ventilate the air and remove harmful gases. 6. Pay attention to the safety interval for the use of smoke agents. The market cannot be collected within the safety interval.

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