Is spraying medicine at high temperature or low temperature?

(1) Different kinds of pesticides have different temperatures that are beneficial to their efficacy. Such as dichlorvos, dimethoate, trichlorfon and ethyl ammonium phosphate, the spraying effect is better in the range of 20-30℃. The mixture of pyrethroids and sulfur is more suitable in the range of 15-25℃.

(2) When the weather is hot, you should choose to apply the pesticide when the temperature is low, preferably at 4: 00 -7: 00 pm on sunny or cloudy days, but some drugs are different, such as herbicides and hay phosphorus, and the effect is better on sunny days than on cloudy days. The application of Bordeaux mixture on cloudy days is prone to phytotoxicity.

(3) Don't spray on rainy days or when there is dew. Because the application of pesticides in rain and dew will dilute the concentration of pesticides and reduce the efficacy.