Low-temperature seasonal crops are also ill. In the winter, pesticides are required to be added strictly according to the dilution factor. The amount of water should not be reduced at will.
1. Extend the safety interval of crops. The pesticides applied in winter have a slow degradation rate, so the residual period in the crops is relatively prolonged. Especially in the prevention and control of diseases and insect pests such as vegetables and flowers in winter, special attention should be paid to prolonging the safety interval of pesticides to ensure human health and prevent poisoning accidents. occur.
2. A small packet of “medicine primer†or 15 grams of vegetable oil can be added to each barrel of the diluent as an adhesive, but it cannot be used when used on vegetables.
3. Appropriately increase the dosage. The pesticide lethal dose of pests is not constant. The higher the temperature, the lower the lethal dose of pests. Therefore, it is necessary to increase the dosage in winter to prevent death from pests and diseases. The increase in dosage should be determined according to the temperature, but generally it should not exceed the conventional medication. 50% of the amount. The application of pesticides in winter requires strict addition of water according to the dilution factor, and the amount of water cannot be reduced at will.
4. Choose the medicine for sunny days and high temperature. In the high temperature season, the effect is generally good after 4 pm, when the leaves of the crop absorb the most pesticides. In winter, it is different. It is best to choose a sunny day when the temperature is high. For example, when the herbicide is applied at a high temperature, the weeds absorb the agent at a high speed, a large amount, and the metabolic decomposition is difficult, so that the purpose of weeding is easily achieved.
5. Give priority to the use of soil pesticides. The price of soil pesticides is low, and the disadvantage is that it is easy to produce phytotoxicity. However, the fruit trees are resistant to pesticides during the dormant period in winter. It is economical and effective to control pests with pesticides such as Bordeaux mixture and stone sulphur mixture.
6. Reasonably select pesticides suitable for winter application. In general, stomach poisons and contact agents are less affected by temperature, and systemic and fumigants are more affected by temperature. Such as trichlorfon, dichlorvos, dimethoate, omethoate, methamidophos, etc., low temperature will significantly affect its insecticidal effect; while pyrethroid, deltamethrin and other insecticidal ester pesticides and phoxim Pesticides such as stone sulphur mixture can still exert better insecticidal effects when applied at lower temperatures. Therefore, when applying pesticides in winter, it is best to use the latter types of pesticides. The herbicide is used in the low temperature season in winter, and the time for displaying the effect is much longer than that at the high temperature. As long as the liquid is sprayed in place, it is generally not necessary to re-medicate.
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