What are the precautions for spraying pesticides in high temperature weather?

Summer is a period of exuberant growth for many plants, and it is also the peak period for the harm of various diseases and insect pests, and the rise in temperature also brings inconvenience to crops and is extremely prone to drug damage. What are the precautions for spraying pesticides in hot weather?

1. Avoid high temperature and bright light

In high temperature and strong light, most pests hide in the cool backlight, at this time, the spray is not easy to hit the target, and the pesticide decomposes quickly, the volatilization loss is large, and the insect control effect is not good; in addition, the pesticide is highly volatile, which is easy to cause poisoning.

2. The effect of low temperature and no rain is good

When there is no sun exposure in rainy days, pests that like to go out during the day and night will often climb out to harm crops, so cloudy and rainless weather is a good time to kill pests, and spray erosion-resistant fungicides on cloudy and rainy days. dosage forms such as EC or suspending agents can well reduce the number of bacteria and reduce the waste caused by Rain Water.

If in the sunny day, it is necessary to spray from 8 am to 10:00 after sunrise or after 5 pm without dew before sunset, when the insect pests are more active and the insecticidal effect is good; the windy weather will cause uneven spraying and easy to cause drug damage, so the spraying should be stopped at this time.

3. Do not change the concentration of pesticides casually

Water volatilizes quickly in high temperature weather in summer, if the concentration of pesticide sprayed at this time is too high, it is easy to cause drug damage to crop leaves. So the majority of farmers, do not want to improve spraying efficiency, or want to enhance the effect of prevention and control, and blindly increase the amount of pesticides, reduce dilution times, increase liquid concentration, especially in the hot summer season.

4. Add adhesive to water agent and wettable powder pesticide

When preparing pesticides, adding 100-150 grams of soybean powder or washing powder or two bags of Jiamejin as synergist to 100 kg solution can improve the adhesion of water agent and wettable powder pesticides and enhance the effect of application.

5. Determine the safe interval of spraying according to the toxicity of pesticides.

Generally, the residual period of high toxic pesticides is more than 1 month, and that of high efficient and low toxic pesticides is 7-10 days. No matter grain, oil, melon crops and fruit trees, the use of drugs should be stopped before harvest in order to prevent human and animal poisoning.

When spraying in high temperature weather in summer, you must exchange enough water according to the instructions of the medicine, ensure the dilution multiple, ensure that the dosage of the liquid per mu is more than 45 kilograms, and choose the appropriate time period for spraying to do a good job of your own physical protection. When dispensing, the upper level of the liquid in the bucket should be below the scale line, and the sealing ring of the lid must be intact to ensure that the lid is closed tightly. Avoid spilling and touching the body, causing poisoning to the personnel.

6. Choose pesticides with quick effect or strong internal absorption.

Quick-acting pesticides such as dichlorvos, methotrexate, trimethoprim and cyanocyanide EC have strong toxic effect and can kill pests in 1-2 hours after use. While pesticides with strong internal absorption, such as dimethoate, Metalaxyl, and so on, more than 80% of the active ingredients can be absorbed into the internal tissue by crops 4-5 hours after use, and even if it rains, they can still kill pests and germs.

7. Mistakenly think that the closer the sprinkler is to the target, the better the efficacy will be.

Many people think that the closer the sprinkler is, the more wasteful the medicine is, the better the effect is. This is wrong. Large droplets will cause drug damage to crops. In a certain distance, the farther away from the nozzle, the smaller the droplets, so that the droplets are easier to deposit and spread on the target, which we should pay more attention to when administering medicine.