The netizen Scarecrow sent an email: What kind of herbicides are used in greenhouses? What should we do if we have mixed grasses and broad-leaved weeds and there are many sedges?

Greenhouse leeks are generally planted in a transplanting manner. After transplanting, they can use pendimethalin, prometryn, and sedation for soil sealing. Applying supplemental milk 330ml/l or 200-250ml/sec 48g securinary EC to each acre and spraying 50kg of water can control a wide range of grass weeds and some broad-leaved weeds. It is safe for leeks. 50% per acre with 100-150 g of WP can be used to control a wide variety of broadleaf weeds. It is best not to use paracetamol on sandy soil or sandy loam soil to prevent leaching of drugs into the roots of leeks after repeated irrigation.

Old root leeks have strong resistance to the drug. In addition to the above mentioned drugs, trifluralin and oxyfluorfen can also be used to control weeds. To see more fields such as aphid weeds and weeds, we can spray 100-150ml of 48% trifluralin per acre. In order to avoid affecting the growth of leeks, spray as much as possible to avoid contact with the leeks. Trifluralin is volatile and photolytically ineffective, and cultivating 1-3 cm of cultivating soil after spraying. For grassy weeds, broad-leaved weeds and sedges, 50-60 ml of 24% oxyfluorfen EC can be sprayed per mu. With the etherification of oxyfluoride, brown spots appear on the tip of the leeks after unearthing. After several days, the spots can spontaneously disappear. These agents are all soil sealing treatment agents and have poor efficacy against older grasses. Manual removal of large grasses should be done first. In the old root vegetable field, it is necessary to spray a herbicide once, and control the application after the wound has healed. The drug is applied when the wound is not healed, and the agent enters from the wound and is prone to phytotoxicity. For instance, when pomegranate is used when the wound is not healed, it will inhibit the photosynthesis of the leek, reduce the number of times of market, and at the same time make the leaves narrow and the quality is reduced.

After spraying herbicides such as trifluralin, attention should be paid to the ventilation of the greenhouse, otherwise the volatile herbicide concentration will be too large, or the drug dissolves into the water on the shed film, and it is easy to produce leek on the leaves of the leek. Phytotoxicity.

When the weeds grow in the field, they can be controlled with quizalofop-p-ethyl, high-efficiency flupirtine, etc.; when grass weeds and broad-leaved grasses are mixed, if the grass age is small, spray B. Oxyfluorfen has a good herbicidal effect, but it can easily cause burn spots on the leek leaves, affecting the appearance.

Severe weed damage, especially when the roots of malignant broad-leaved weeds and sedges are severe, if the leeks have a certain amount of growth, consider cutting the leeks (weeds are not cut) and cover them properly with clean maps. , And then spray it to make 200 grams / chlorfluoxacion EC or clozapine, to control the field of malignant broadleaf weeds, sedges. The chlorofluoroacetic acid has a good control effect on broad-leaved weeds. Both of these medicines may cause certain phytotoxicity to leeks, and it is best not to spray them directly during long-term growth of leeks. Before the large-scale application of pesticides should be a small area of ​​the test, and then expand the area after success.

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