Types of garden biocidal herbicides and precautions for use
Garden biocidal herbicides are chemical products commonly used for garden weeding and have very good effects on killing various weeds. So, what types of garden herbicides are there? What issues should be paid attention to when using garden biocidal herbicides? The following editor will lead you to understand the types of garden herbicides and precautions for use:
Types of garden herbicides
(1), glyphosate (other products Names include Roundup, Chunduoduo, Farmer Le, Dalinong, etc.): It is a systemic conductive broad-spectrum herbicide. Stems and leaves are treated, but soil treatment is ineffective. It is suitable for spraying on nursery trails and under big trees in gardens. Its characteristics:
Broad-spectrum weed killing: it can kill more than 100 species of weeds in more than 40 families. The best control effect is narrow-leaf weeds. (Such as Poaceae, Cyperaceae). Some plants with thick waxy layers on their leaves, such as Leguminosae, Liliaceae, Theaceae, Lauraceae, etc., are highly resistant to pesticides and have extremely poor control effects on bamboos and awns. It is effective in controlling Imperata cogongrass, Miscanthus quinquefolius, Miscanthus grandis, and cabbage fern in woodlands, and can cut weeds and roots. The price is low and the economic benefits are significant. No environmental pollution, no impact on seeds and soil microorganisms hidden in the soil. It should be sprayed on weeds in a targeted manner, otherwise it is easy to cause phytotoxicity and it is not suitable to spray on small seedling beds. It has strong mixability and can be mixed with soil treatment herbicides such as Gaicaoneng and Goer. In addition to killing weeds, it can also prevent weed damage. Main weakness: single use has no preventive effect on ungerminated weeds after being planted in the soil. Common dosage forms include liquids, soluble powders, etc.
(2) Glufosinate (glufosinate) is a systemic conductive broad-spectrum herbicide. Stems and leaves are treated, but soil treatment is ineffective. Used for weeding in orchards, vineyards, non-arable land, and controlling raspberries and ferns in forests and alpine pastures.
(3) Paraquat (gramoxone, grass-killing, tornado) is a fast-acting contact-killing broad-spectrum herbicide. Stems and leaves are treated, but soil treatment is ineffective. It kills most grass and broadleaf weeds and only affects green tissue. The effect is quick. It can be absorbed by weeds half an hour after application. It will not be affected by rain half an hour later. The effect is quick. It will turn yellow in one day and die in three days. But it can only kill the above-ground part, not the underground part, and new grass will grow back after a few days.
Precautions for using biocidal herbicides in gardens
1. Do not abuse biocidal herbicides: Although biocidal herbicides can achieve ideal control effects when used appropriately, they are not perfect. . For example, paraquat has a short duration of effect and is not completely effective against most weeds with well-developed roots and stems and long growth periods. The weeds still appear after being sprayed, so the effect is poor. According to reports, in recent years, the serious occurrence of Cyperus rotundus in corn fields is closely related to the use of biocidal herbicides. The use of glyphosate will not only kill the seedlings, but also cause root rot. However, improper application will cause greater losses, so it should be used with caution. In addition, the misuse of herbicides can easily induce weed resistance. At present, the resistance of some weeds to paraquat and glyphosate has become more prominent. Therefore, when used in different crop fields, try to choose some herbicides with different selective action mechanisms, and do not rely too much on biocidal herbicides.
2. Biocidal herbicide varieties should be selected rationally and their application scopes should be accurately distinguished. Paraquat and paraquat are non-conductive stem and leaf herbicides that can only control the upper green parts and are almost ineffective on the roots. However, their herbicidal effect is fast and can have an immediate effect; glyphosate and glyphosate Alamphosphine is a transmissive herbicide. It is not only effective on the upper green part, but also can be transmitted to the roots and is effective on perennial weeds. Therefore, it has a wider range of uses, but the herbicide effect of this type of herbicide is slow.
3. Broaden its application scope based on its selectivity in destroying life. Although it destroys life, if it is used appropriately, selectivity problems may still occur. For example, if the time is separated from the crop, the pesticide should be applied before sowing or before emergence; in terms of position difference, choose a location different from the green part and apply the pesticide in the lower part of the crop. As long as the pesticide is not sprayed into the green part, the crop can be harmed. Protected; in terms of space, you can use protective measures, apply pesticides in wide rows, and avoid spraying pesticides on crops to achieve the desired effect. Therefore, on the basis of fully understanding the basic characteristics of biocidal herbicides, use biocidal herbicides appropriately and rationally to avoid indiscriminate use.
4. Fully understand the hazards of biocidal herbicides and avoid phytotoxicity.
When spraying, be sure to avoid spraying or drifting onto the crops. It is forbidden to use biocidal herbicides on windy days. Generally, do not spray pesticides after use. If you want to spray pesticides, be sure to wash them 3 to 5 times with detergent. Even so, this sprayer cannot be used to spray seedlings during the seedbed stage.
5. Soil treatment: Current biocidal herbicide varieties tend to lose activity quickly in the soil, so they cannot be used as soil treatment agents. However, it can be used optionally for weeds that have emerged.
6. Pay attention to medication safety. Medication safety refers to the phytotoxicity of crops. Generally, the following points must be achieved: ① Prepare and use in strict accordance with the prescribed dosage, methods and procedures. Do not increase or decrease the dosage at will. And the spraying should be even and no leakage or repeated application. ②According to the targeted characteristics of herbicides, herbicides must be used before emergence and cannot be used after emergence. Soil treatment agents cannot be used to treat stems and leaves. After application of soil treatment agents, the soil must be kept moist to facilitate the effectiveness of the medicine. ③ It is not advisable to spray in high temperature, high humidity or windy weather. Generally, spraying should be done on sunny, windless or breezey weather with a temperature of 20-30℃. When spraying, the direction of the nozzle hole should be consistent with the direction of the wind. The direction should be perpendicular to the wind direction or the angle should be no less than 45 degrees. The downwind area should be sprayed first and then the upwind area to prevent the liquid from drifting with the wind and damaging nearby sensitive crops. ④ In principle, it cannot be mixed with chemical fertilizers or other pesticides to prevent phytotoxicity. If the mixture must be used, it should be tested before application. The sprayer for spraying herbicides must be rinsed thoroughly with clean water before use, otherwise it may cause pesticide damage. ⑤ Pay attention to avoid drug hazards. To avoid the sensitive period of the crop, it is better to spray the weeds at the 26-leaf stage when treating stems and leaves. ⑥The plot for soil treatment must be plowed and leveled, and the chemical solution must be sprayed evenly, otherwise the efficacy will be reduced. The efficacy of herbicides and the damage to crops decrease in the order of sandy soil, loamy soil, and heavy clay soil. Therefore, within the normal dosage range, the dosage of herbicides can be smaller for sandy soils and larger for heavy soils.