How to spray pesticides scientifically? How to dilute pesticides?

As a farmer, who hasn't sprayed pesticides? If you say that a farmer won't spray medicine, it's just like saying who is a layman! But in fact, there are not many people who can really do scientific pesticide spraying. How to science? Spraying? How to dilute the preparation of pesticides? That is really learning!

How to spray pesticides scientifically?

Grasp the timing of spraying

It is common for vegetable farmers to get used to spraying medicine for three or four days, thinking that they can sit back and relax. In fact, this method is very wrong, not only the cost is increased, but also the drug is particularly prone to cause rapid increase in pest resistance, so that it cannot be controlled when it occurs.

A reasonable method is to use the drug at the beginning of the pest, and the disease is recommended to spray a protective fungicide on a regular basis. At the beginning of the disease, a symptomatic therapeutic fungicide is taken according to the type of the disease.

Suitable amount of liquid spray

The amount of liquid spray is not as good as possible. Usually, there are often vegetable farmers who ask me to spray a few barrels of water when spraying. In fact, this is a problem that cannot be answered. The most reasonable amount of liquid spray when spraying is to spray the leaves to the surface and it is just the best. good.

Scientific experiments have shown that if the amount of liquid remaining on the leaves after spraying the leaves is only about half of that when the liquid drops on the leaves, not only a lot of waste is caused when spraying the dripping water, but also the actual control effect is large. discount.

Some vegetable farmers are accustomed to spraying liquids very little, and the concentration of drugs is very high. This is also unscientific, because it is not only prone to phytotoxicity, but also the phenomenon of leakage is serious, the target is not sprayed, and the control effect is not satisfactory.

Different control targets, different spray positions

If spraying drugs to control pests such as thrips, mites, and whitefly, focus on the young or middle part of the plant. If the general disease is controlled, focus on spraying the old leaves that are easy to be affected in the middle and lower parts. For diseases such as disease, blight, and blight, the base of the stem should be sprayed with emphasis.

Liquid preparation

When using the pharmaceutical liquid, it is recommended that you use the second dilution method, that is, dissolve the pesticide in a small amount of water, and then add it to the water evenly, so that the agent can be dissolved more uniformly in water and the effect is better.

Pesticide mixing sequence

If you spray a variety of pesticides at a time, such as insecticides , fungicides, foliar fertilizers, etc., you must remember that when you use the pharmaceutical liquid, you must first add foliar fertilizer, then add powder to kill or kill the powder. Insecticide, and finally add the pesticide of the emulsion type. In this order, the efficacy of the drug is less affected, and conversely, it may have a great impact or even failure on the effects of various pesticides.

Spraying method

If a manual sprayer is used, it is best to spray against the blade. If it is a mister or a high-pressure electric sprayer, it should be sprayed parallel to the top of the plant. If the plant is sprayed, there will be a lot of liquid spray. Ground, causing waste.

Spraying insecticides and bactericides is generally a person standing on the upper air vent, spraying the front side or just spraying the left or right side, and spraying the herbicide, especially the ground-sealed herbicide, is generally a reverse spray to destroy the film.

How to dilute pesticides?

First, the dilution method

Percentage concentration: refers to the number of parts of the active ingredient containing 100 parts of the drug solution or powder, expressed in %. For example, 2% urea means 2 kg of urea and 98 kg of water in 100 kg of urea solution. Multiple concentration: refers to the water addition multiple of 1 part of pesticide, which is usually expressed by weight. For example, prepare 700 times of 50% carbendazim, which is made by mixing 50 parts of carbendazim and adding 700 parts of water.

Second, the conversion method

The percentage concentration is converted to ppm concentration: the conversion formula is 1 part of the pesticide plus water = the percentage of pesticide × 1000000 / the number of ppm to be formulated. For example, a 40% ethephon is formulated into a 2000 ppm solution of 1 kg, and an ethephon is 40% x 1000000/2000: 200 kg ppm.

Convert to multiple concentration: divide the percentage by the number of ppm and shift the decimal point back by 4 to get the dilution factor. For example, 40% of ethephon is 1000 ppm. When converted to a multiple concentration, 40 ÷ 10000 = 0.4, and the decimal point is shifted back 4 places, that is, 400 times.

Third, the watering method

When several pesticides are mixed, not every additional drug is added once, but the same amount of water is used to calculate the concentration. For example, 500 times of urea and 1000 times of methyl thiophanate are prepared by adding 2 parts of urea plus 1 part of methyl thiophanate plus 1000 parts of water. In addition, when watering, it should be formulated into a mother liquid, that is, first use a small amount of warm water to open the liquid, then add water to the desired concentration, fully dissolve, improve the suspension, improve the efficacy, and prevent phytotoxicity.

More pesticide knowledge , please pay attention to China Pesticide Network

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