Winter crop spraying 5
In winter, the temperature is low, and most of the activities and hazards of plant diseases and insect pests are hidden and stationary. When using chemical pesticides in winter, in addition to choosing pesticides on the road, we should also pay attention to the following 5 points:
The first is to choose sunny days of high temperature medication. Because in the winter when the temperature is high, the pest feed and respiratory intensity is greater than the cold weather, the liquid sprayed on the body of the body, there are many drugs brought to the body, is conducive to play poisonous effect.
The second is to increase the dose. The lethal dose of pesticides from pests is not constant. The lower the temperature at room temperature, the lower the lethal dose of insect pests. Therefore, increasing the dose of pesticides in winter can prevent insecticides from eating and killing. However, it does not exceed 50% of the conventional dosage. When applying pesticides in winter, water should be added strictly according to the dilution factor. Do not arbitrarily increase or decrease the amount of water.
The third is the rational selection of pesticides suitable for winter use. In general, stomach poisons and contact poisons are less affected by temperature, and inhalants and fumigants are more affected by temperature. Such as the enemy killed, dichlorvos, dimethoate, methamidophos and other low temperatures will significantly affect the insecticidal effect. However, pesticides such as deltamethrin, phoxim, and lime sulfur can still exert better insecticidal effects when applied at lower temperatures. When herbicides are used at low temperatures in winter, the display effect is much longer than that at high temperatures. Therefore, be patient and wait until the liquid is sprayed. Usually, no need to re-apply.
The fourth is to extend the safety interval of crops. The degradation rate of pesticides in winter will be slower, and the residual period of pesticides in crops will also be relatively prolonged. When pests and diseases in vegetable crops are to be controlled, it is necessary to extend the safety intervals of pesticides to ensure human health.
The fifth is to pay attention to the barrel of diluted drug solution water. You can add a small packet of "medicinal primer" or "vegetable oil" 15 grams, or acidic substances, as an adhesive. However, it cannot be used when applying Vegetables.
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