Traditional Culture Encyclopedia - Weather inquiry - How long does it take for pesticides to rain? Is the bactericide effective when it rains?

How long does it take for pesticides to rain? Is the bactericide effective when it rains?

Pesticides generally take 5-6 hours to be absorbed by crops after spraying, so they are effective before that. If it rains and winds, it will have some effect, but the drug effect is not so strong. Some better formulas can be absorbed by crops in 3-4 hours because of additives, but it is suggested that if it rains within 5 hours, it needs to be sprayed again.

Spraying on sunny days after 9: 00 a.m. and 4: 00 p.m. in hot season is better, because after 9: 00 a.m., the dew is dry, the temperature is not too high, and pests and diseases are active, so the spraying effect is the best. After 4 pm, pests are active at night. Spraying pesticides at this time can effectively kill pests.

Extended data:

1. In order to prevent the occurrence of crop diseases and insect pests, improve the quality of fruits and vegetables and increase economic benefits, applying pesticides has become the best method. However, the application time of pesticides in different crops in different seasons and different growth stages is different.

2. It should be noted that it is not advisable to spray pesticides at noon, because strong light and high temperature will hide pests in the backlight, and high temperature will also lead to drug effect decomposition. In addition, pesticides will evaporate rapidly at noon, causing human and animal poisoning.

3. Winter and spring seasons are generally between 2: 30 and 3: 30 pm. In winter and spring, the temperature in the shed is very low. Spraying at noon will lower the temperature and affect photosynthesis, so spraying in the morning is not suitable. In addition, the weather is hot, the crops grow vigorously, the stomata of leaves are wide, and the phytotoxicity can easily penetrate into the crops, which may lead to crop damage. At the same time, high temperature and enhanced chemical action of liquid medicine may lead to drug addicts' poisoning.