Even cloudy smoked medicine to prevent phytotoxicity

In the winter cloudy days, the temperature in the shed is lowered and the humidity is increased, which usually causes disease outbreaks. Many vegetable farmers will choose smokers or powders to prevent and treat vegetable diseases. However, the author recently found in interviews that many vegetable farmers have developed phytotoxicity after using fumigants or powders. The tomatoes of Master Wang of the Wangcheng Village in the ancient city street of Shouguang City caused white spots on the petals of tomatoes because of the use of smoked agents. Some of the flower buds fell off, and the upper leaves were more serious. So how do you use a fumigant to avoid phytotoxicity?

The first is the choice of medicament. There are many medicines, vegetables are more sensitive to them, and if they are not used, they are easy to cause phytotoxicity. Therefore, it is best not to use a pyridoxamine or a smoker with the words "oxazole" or "alcohol".

The amount of the second agent should be accurate. The dosage of the medicament should be determined according to the size of the indoor space of the shed and the degree of occurrence of pests and diseases. The shed is high, the space inside the shed is large, and the pests and diseases are serious, and the amount of the medicinal agent can be appropriately increased. Such as prevention and treatment of downy mildew, early and late blight, etc., can use 45% chlorothalonil smoke agent per 300 to 350 grams per mu; for the control of gray mold, sclerotinia, etc., can use 50% procymidone smoke agent 350 to 400 per mu Ke or ethylene sclerotant smoker is 200-250 grams per mu; for controlling aphids, leaf miners, whiteflies, etc., 10% isopropanol can be used in an amount of 400-500 grams per mu. If pests are controlled at the same time, the amount of bactericidal smoke and insecticide should be appropriately reduced.

The third smoking time is well controlled. Generally, the time of smoking can not be too long, and the normal time of smoking is generally about 6-8 hours. The longer the time, the more likely it is to cause problems. Ventilation is completed in time to avoid gas retention in the shed for a long time, resulting in vegetables not growing properly.

Fourth, you should watch the weather forecast in time. If the cloudy day is heavy, you can't smoke the shed when you can't pull the shed. In this case, because the air in the shed does not circulate for a long time, if the fumigant can't release the wind in time, it will easily lead to crop damage in the shed. Therefore, you should watch the weather forecast in time to make sure that the next day can be smoothly turned sunny or the curtain can be opened, and the smoke can be taken the night before.

Author: Shao Hong bead
Source: Shandong Science and Technology News

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