In addition to the use of chemical pesticides during the winter cold period, the following points should be noted:
1, to increase the amount of medication. The pest lethality of pesticides is not constant. The higher the temperature at room temperature, the lower the lethal dose of insect pests. Therefore, it is necessary to increase the dosage in the winter season to prevent the death of insect pests. The amount of medication should be determined based on the temperature, but it should not exceed 50% of the normal dose. Application of pesticides in winter requires strict addition of water according to the dilution factor. Do not arbitrarily reduce the amount of water used.
2, choose sunny days high temperature medication. The use of drugs in the hot season is generally better after 4 pm, when the leaves of crops absorb the most pesticides. However, in winter, it is better to choose the best temperature for the sunny days. If the herbicide is applied at a high temperature, the weeds absorb the medicament at a high speed and have a large amount, so that the decomposition of the herbicide is difficult and the purpose of weeding is easily achieved.
3, should be a reasonable choice of pesticides suitable for winter application. In general, stomach poisons and contact poisons are less affected by temperature, and the inhalants and fumigants are more affected by temperature. Such as trichlorfon, dichlorvos, etc., low temperature will significantly affect its volatile insecticidal effect; and cypermethrin, deltamethrin, octyl sulfuric acid, lime sulfur and other pesticides, can still play better at lower temperatures The insecticidal effect, therefore, when the winter medication, it is best to choose after the application of several types of pesticides. Herbicides are used during the cold season in winter, and their display effect is much longer than when they are applied at high temperatures. Therefore, be patient and wait until the liquid sprays into place. Generally, no need to re-administer the medicine.
4, to extend the safety interval of the crop. In winter pesticides, the degradation rate of pesticides will also slow down, so the residual period in crops will also be relatively prolonged. Especially in the prevention and control of vegetable pests and diseases in winter, special attention should be paid to prolonging the safety interval of pesticides to ensure human health and prevent Poisoning accidents.
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