Spraying pesticides in summer, whether for food crops, vegetable crops, cash crops, or fruit trees, should be the best time between 8 and 10 am and 5 pm. This is because: Around 9:00 am, the general dew is dry and the temperature is not too high. It is the most prolific time for sunrise pests to eat, move, and mate. Therefore, medication is not used at this time because the medicine is washed or diluted with dew. To reduce its efficacy, it will not affect the efficacy due to the decomposition of the chemicals caused by high temperatures. On the contrary, the use of drugs at the time will increase the chances of pests feeding and touching drugs, effectively increasing the lethality of pesticides. At about 5 o'clock in the afternoon, the sun was already on the west side. The light faded and the nocturnal insects became active (feeding, mating, etc.). Therefore, spraying at this time also had a higher killing effect.
Also note that pesticides should not be sprayed at noon. Therefore, when the temperature is high and the sunlight is strong, some pests are afraid of the glare and hide in the backlight, and even stop their activities. Combined with rapid drug decomposition at high temperatures, the efficacy is reduced. At the same time, the general drug solution at the noon volatilizes quickly and easily leads to poisoning of humans and animals.
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