In winter, the temperature is low. In the prevention and control of crop diseases and insect pests, many farmers still follow the traditional habits, using large amounts, frequent times, and abusing drugs. In this way, not only the pests and diseases will not be rectified, but also the condition will be aggravated. So, how do you use medicine scientifically? Spray pesticides in winter, just keep two words in mind - reasonable. How to be "reasonable"? Now let me introduce you a few good methods. 1. Rational use of pesticides Some pesticides are greatly affected by temperature, and their efficacy decreases with decreasing temperature, while some pesticides are less affected by temperature, even at lower temperatures (below 15 °C), they can exert their normal insecticidal effects. Such as pyrethroids, the toxic effect of this insecticide at low temperatures (15 ° C) is higher than at high temperatures (25 ° C). Therefore, in winter and spring low temperature seasons to control crop pests and diseases, we must pay attention to the use of pesticides with less temperature impact. 2. Appropriate increase in dosage Spray pesticides in the low temperature season. Under the guidance of professionals, increase the dosage and increase the concentration of the liquid, but not exceed the “safe high concentration†(ie, the maximum allowable dose without phytotoxicity). 3. Choose a sunny day and high temperature spray When the temperature is high, the range of activity and respiratory intensity of the pest increase, and the amount of food intake increases. At this time, spraying is beneficial to improve the control effect. 4. Improve the application method In the winter, we should use the smoke method or the dust method to prevent crop pests and diseases in the greenhouse. If the spray method is applied, the number of prevention and the amount of liquid spray should be appropriately reduced to prevent the humidity in the shed from being too high. 5. Prolong the security interval In the low temperature season, the degradation rate of pesticides is slow, and the time remaining in the crops is relatively long. It is necessary to appropriately extend the number of days (ie, the safety interval) of the last application of the crops to ensure safe food. More pesticide knowledge , please pay attention to China Pesticide Network
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