What should you pay attention to when spraying pesticides on plants?

In the process of agricultural production, spraying pesticides on crops is an indispensable link. Recently, many farmer friends often ask the editor, how to spray pesticides in hot weather, and how can a few pesticides damage crops? Give full play to the efficacy of the medicine. Today, the editor will tell you in detail some things you should pay attention to when spraying pesticides to prevent diseases, insects, and weeds in hot weather in summer:

1. Avoid high temperatures and strong light at noon When spraying, chemical pesticides should be sprayed around noon when the temperature is high and the light is strong. First, the pesticides are highly volatile and can easily cause poisoning of the pesticide applicators; second, most pests hide in cool and backlit areas, making it difficult to hit them with sprays. On the target, at the same time, pesticides decompose quickly and have large volatilization losses, so the insect control effect is not ideal.

2. Choose a cloudy day with no rain to spray. If it is a sunny day, spray at 8-10 a.m. after sunrise or after 5 p.m. before sunset when there is no dew and when pest activity is high. . When the wind is strong, spraying should be stopped, otherwise it will cause uneven spraying and easily cause pesticide damage.

3. When spraying pesticides in summer, you should pay attention to physical protection and try to avoid contact between pesticides and skin.

4. Avoid increasing the concentration of the pesticide arbitrarily. In order to improve work efficiency or to enhance the control effect, some farmers often increase the dosage of pesticides, reduce the dilution ratio of pesticides, and increase the concentration of the pesticide arbitrarily, even in midsummer. This is still the case during the hot season. Since water evaporates quickly under the hot sun, if the concentration of pesticides sprayed is too high, it is easy to cause chemical damage to plant leaves.

5. Use fast-acting pesticides, such as dichlorvos, mesozolin, sulfacin, and cyanide emulsifiable concentrate, which have strong poisoning effects and can kill pests 1-2 hours after use. Choose pesticides with strong systemic properties, such as dimethoate, methacil, and metalaxyl. More than 80% of the active ingredients can be absorbed into the internal tissues of the crop 4-5 hours after use, even if it rains. Kill pests and germs.

6. Adding adhesives to aqueous and wettable powder pesticides. Aqueous and wettable powder pesticides have poor adhesion. When preparing pesticides, add 100-150 grams of soybeans per 100 kilograms of pesticides. Powder or washing powder or two bags of Jiamei Gold Dots can be used as synergists to improve the effectiveness of pesticides.

7. Determine the safe interval for spraying according to the toxicity of the pesticide. Generally, the residual effectiveness period of highly toxic pesticides is more than 1 month, and the residual effectiveness period of high-efficiency and low-toxic pesticides is 7-10 days. Regardless of grain, oil crops, melon crops and fruit trees, medication should be stopped according to regulations before harvesting to prevent poisoning of humans and animals.

Therefore, when applying pesticides during the high temperature season in summer, you should pay more attention to adding enough water to ensure the dilution factor. The dosage of pesticide solution per acre must be more than 45 kilograms. Avoid overfilling the tank with chemical solution. Some farmers like to fill the sprayer bucket very full with chemical solution when spraying. This is not only detrimental to spraying, but more importantly, if the cover of the sprayer is not tightly closed, the spray liquid will splash out and get on the body of the sprayer when walking in the field, which can easily cause poisoning in hot seasons. The correct approach is that when dispensing medicine, the liquid level in the barrel should be below the scale line, and the sealing ring of the lid must be intact to ensure that the lid is tightly closed.

Pesticide mixing is a common method of using pesticides. In order to facilitate and save labor, farmers often mix several pesticides together and apply them in the process of preventing and controlling pests and diseases. Not all diseases and insect pests require the mixing of pesticides. Here are some tips: The editor summarizes several common situations where pesticides need to be mixed.

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 2,4-D and the fungicide (fludioxonil) for preventing and controlling gray mold , Pyrimycin, etc.) and then apply them to tomato flower buds (or dipped flowers);

2. Pesticides can be mixed when more than one disease occurs on one crop at the same time; for example, when cultivating in protected areas Whiteflies or aphids and downy mildew, gray mold, etc. often occur on cucumbers at the same time. Usually, the agent for controlling whiteflies or aphids (imidacloprid) is combined with the agent for controlling downy mildew (metalaxyl, mancozeb) or Mix the agents used to prevent and control gray mold (iprodione, nicotinamide, fludioxonil, etc.).

Pesticides commonly used on vegetables now, such as trichlorfon, dichlorvos, polycarbophylla, bromothrin, thiophanate, zine, thiophanate, thiram, carbendazim, chlorothalon Chrysanthemum, erythromycin, ethyl aluminum, captan, etc. can be mixed and used according to the needs of pest control.

Not all pesticides are effective when mixed. When mixing pesticides, you need to pay attention to the following points:

1. Mixed pesticides cannot undergo chemical changes;

2 , Mixed pesticides cannot increase toxicity;

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

4. Mixed pesticides should have different mechanisms of action or different control targets.

Finally, the editor’s warm reminder: Be careful when mixing pesticides, especially some strong acid and alkali pesticides, so as not to reduce the efficacy and cause harm. Therefore, you should read the label carefully before using pesticides, and try them on a small area before using them on a large area.