What should be paid attention to when spraying pesticides to control diseases, insects and weeds in summer? Which pesticides can be mixed?

In the process of agricultural production, it is often attacked by some germs, insect pests and weeds, which leads to the decrease of yield, the deterioration of quality and the reduction of harvest and economic loss to farmers. Therefore, when spraying pesticides to control diseases, insects and weeds in summer, we should pay attention to the following points:

First, to avoid the high temperature and strong light at noon, and to spray chemical pesticides around noon when the temperature is high and the light is strong. First, the chemical is highly volatile, which is easy to cause poisoning to the pesticide application personnel; second, most pests hide in a cool backlight place. Spray is not easy to hit the target, at the same time, pesticide decomposition is fast, volatilization loss is large, the pest control effect is not ideal.

Second, choose a cloudy day without rain. If it is a sunny day, spray after 8 am to 10:00 after sunrise or after 5 pm when there is no dew before sunset and when the pest activity is booming. When the wind is strong, you should stop spraying, otherwise it will cause uneven spraying and easy to cause drug damage.

Third, when spraying pesticides in summer, you should pay attention to physical protection and avoid contact with the skin as far as possible.

Fourth, do not increase the concentration of the liquid at will. In order to improve the work efficiency or enhance the control effect, some farmers often increase the dosage of pesticides, reduce the dilution times of pesticides, and increase the concentration of the solution at will, even in the hot season in midsummer. Due to the rapid volatilization of water in the hot sun, if the concentration of pesticide sprayed is too high, it is easy to cause chemical damage to plant leaves.

Fifth, the selection of quick-acting pesticides, such as dichlorvos, methamphetamine, trimethoprim, cyanocyanide EC and other pesticides have strong toxic effect, and the pests can be killed within 1-2 hours after use. Choose pesticides with strong internal absorption, such as dimethoate, Metalaxyl and so on, 4-5 hours after use, more than 80% of the active ingredients can be absorbed by crops into the internal tissue, even if rain can still kill pests and germs.

6. when adding adhesives, water agents and wettable powder pesticides to water agents and wettable powder pesticides, the adhesion of pesticides is poor. When preparing pesticides, 100-150 grams of soybean powder or washing powder or two bags of Jiamejin points are added to 100 kg liquid as synergists to improve the use of pesticides.

7. The safe interval of spraying is determined 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.

Therefore, in the summer high temperature season, we should pay more attention to enough water to ensure the dilution multiple, and the dosage per mu must be more than 45 kg. Taboo bucket is too full, some farmers like to spray the liquid in the sprayer bucket is very full. This is not only disadvantageous to spraying, but more importantly, if the cover of the sprayer is not tightly closed, the liquid will spill and touch the body when the sprayer is walking in the field, which can easily cause poisoning in the hot season. The correct way is that when dispensing, the upper surface 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.

Several common situations of mixed use of pesticides:

Mixed use of pesticides is a common means of use of pesticides. In order to facilitate and save labor, farmers often mix several pesticides together in the process of preventing and controlling diseases and insect pests; not all diseases and insect pests need mixed use of pesticides. The following editor summarizes several common situations that require mixed use of pesticides.

1. In order to achieve the purpose of disease prevention or enhance plant disease resistance, promote plant growth or cultivate strong seedlings

For example, auxin 2p4m D is mixed with fungicides (chlorphenil, pyrimidine, etc.) to control Botrytis cinerea and then smeared with tomato buds (or dipped flowers).

2. Mixed use of pesticides can be carried out when more than one disease occurs on a crop at the same time.

For example, whitefly or aphids, downy mildew, gray mildew and so on often occur on cucumbers cultivated in protected areas. the insecticides for the control of whitefly or aphids (imidacloprid) are usually mixed with those against downy mildew (mancozeb) or those against gray mildew (isobarbamide, nicotinamide, chlorphenil, etc.).

Now the common pesticides on vegetables, such as trichlorfon, dichlorvos, compound fruit, deltamethrin, pyrethrin, zinc benzoate, thiophanate, thiram, carbendazim, chlorothalonil, pyrethroid, aluminum ethyl phosphate, carbendazim and so on can be mixed according to the needs of pest control.

Not all the pesticides used are effective, and the following points should be paid attention to:

1. Mixed pesticides can not undergo chemical changes.

2. Mixed pesticides can not improve the toxicity.

3. The physical properties of mixed pesticides should remain unchanged.

4. Mixed pesticides should have different action mechanisms or different control objects.

Finally, the editor warmly hints: the mixed use of pesticides should be cautious, especially for some strong acid, strong alkali pesticides, so as not to reduce the efficacy and cause drug damage. Therefore, it is necessary to read the label carefully before using pesticides, and use it in a large area after a small trial.