The temperature in winter and early spring is low. When controlling crop pests and diseases, we must pay attention to the rational application of pesticides.
1. Reasonable selection of pesticides Some pesticides (such as dimethoate) are greatly affected by temperature, and their efficacy is significantly weakened with the decrease of temperature, while some pesticides (such as omethoate) are less affected by temperature, even At lower temperatures (below 15 ° C), it also exerts its normal insecticidal action. Similar to omethoate, there is also a pyrethroid, which is more toxic at low temperatures (15 ° C) 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 of dosage The pesticide should be applied in the low temperature season. Under the guidance of professionals, the dosage should be increased and the concentration of the liquid should be increased, but it should not exceed the “safe high concentration†(ie, the maximum allowable dose without phytotoxicity).
3, choose sunny high temperature application temperature When the temperature is high, the pest's range of activity and respiratory intensity increase, the intake of food increases, at this time the application is conducive to improve the control effect.
4, improve the application method Winter and spring to prevent greenhouse crop pests and diseases, try to use the smoke method or dust method to apply; if spray application, the appropriate number of prevention and discharge, to prevent the humidity inside the shed.
5. Properly extend the safety interval In the low temperature season, the degradation rate of pesticides is slow, and the residual time 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.
1. Reasonable selection of pesticides Some pesticides (such as dimethoate) are greatly affected by temperature, and their efficacy is significantly weakened with the decrease of temperature, while some pesticides (such as omethoate) are less affected by temperature, even At lower temperatures (below 15 ° C), it also exerts its normal insecticidal action. Similar to omethoate, there is also a pyrethroid, which is more toxic at low temperatures (15 ° C) 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 of dosage The pesticide should be applied in the low temperature season. Under the guidance of professionals, the dosage should be increased and the concentration of the liquid should be increased, but it should not exceed the “safe high concentration†(ie, the maximum allowable dose without phytotoxicity).
3, choose sunny high temperature application temperature When the temperature is high, the pest's range of activity and respiratory intensity increase, the intake of food increases, at this time the application is conducive to improve the control effect.
4, improve the application method Winter and spring to prevent greenhouse crop pests and diseases, try to use the smoke method or dust method to apply; if spray application, the appropriate number of prevention and discharge, to prevent the humidity inside the shed.
5. Properly extend the safety interval In the low temperature season, the degradation rate of pesticides is slow, and the residual time 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.
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