How to choose post-emergence herbicide for field crops

Since most of the province's provinces have been in arid state after sowing this spring, and winds have accompanied them, the effect of pre-emergence isolation and weed control has been poor. Many areas are facing secondary weeding problems, that is, we must select crop seedlings and then weed again. How to choose post-emergence herbicides? How to use post-emergence herbicides effectively and efficiently? This is a problem that everyone is more concerned about. On this issue, Huang Chunyan, a researcher at the Provincial Plant Protection Institute of the Provincial Academy of Agricultural Sciences, made several suggestions to the farmers' friends and hoped to help the farmers.

When selecting and using herbicides, read the instructions carefully to see if you can use them later to prevent misuse and cause unnecessary losses. If you do not know which herbicide to use, you can go to the local agricultural technology promotion center, plant protection station and other related departments, or call the relevant technical staff. In short, herbicides have a dual nature and they can both weed and injure crops, so be careful when selecting herbicides.

Optional post-emergence herbicides in corn fields

Yu Nongle (Nicosulfuron) broad-spectrum herbicide is effective against grassy weeds and broad-leaved weeds. It has a good weed control effect and is safe for corn. However, it should be noted that Yunongle is not safe for the Denghai series of maize varieties and is prone to injury. If the corn varieties planted belong to the Denghai series, they cannot use jade farmers' music; in addition, Yunongle sticks to sticky corn, Special maize such as sweet corn and popcorn is not safe and cannot be used.

Atrazine (Atrazine) broad-spectrum herbicide is effective against grassy weeds and broad-leaved weeds. It has a good herbicidal effect and is safe for corn. It can be used for pre-emergence soil closure and post-emergence stem and leaf treatment. . However, the effect of post-emergence seedlings on grass weeds is somewhat less effective and has a greater effect on broad-leaved weeds.

The herbicides used to control broad-leaved weeds, with octyl bromide, are effective in weed control and safe to corn. Need to be mixed with herbicides to control grass weeds.

2,4-D-butyl ester herbicides to control broad-leaved weeds have a good herbicidal effect, but different corn varieties have different susceptibility to them. In recent years, phytotoxicity often occurs after production, and the symptoms of pesticide injury often occur in corn. It was not until late in the growth period that the "gun shank" of the corn was the symptom of 2,4-D-butyl phthalate. The "gun shank" could not be normally planted and a single strain of the crop was produced. Therefore, 2,4-D-butyl ester should be used with caution, and conventional maize varieties cultivated in large quantities in production can be used post-emergence, but the amount of drugs to be controlled must not be used in excess; unfamiliar, not large areas for production For corn varieties, 2,4-D-butyl ester is not recommended after seedling emergence.

It is recommended to mix combinations:

1. Mixing Yu Nong Lok and Atrazine: Two agents are respectively used for 1/2 or 2/3 of the recommended amount, and are now mixed.

2. Mixture of Yunongle, Banchan, and 2,4-D-butyl phthalate: It is recommended to use it in conventional corn fields. The recommended amount of jade farmland and farm land use is 1/2, and 1,2-dibutyl butyl ester is 1/3 of the recommended amount.

Optional Herbicides After Seedlings in Soybean Fields

Huwei (fenflufen) prevents herbicides from broad-leaved weeds and has a broad spectrum of weed killing. After application, the soybean leaves have contact-killing lesions. This is a normal phenomenon and has no apparent effect on soybean growth. There is no medicine damage on the leaves. It is worth noting that in recent years, there have been serious residual drug hazards in the planting of corn in Houwei, a soybean field planted with Huwei, and they must not be used excessively when using Huwei, and should be strictly controlled within the recommended dose range. Need to be mixed with grass weed herbicides.

Bendazosone (Betrazolone) is a herbicide that can control broadleaf weeds and has a broad spectrum of herbicides. It has special effects on cocklebur and is safe for soybeans. Need to be mixed with grass weed herbicides.

Weeds burning (Acifluorfen) to control broad-leaved weed herbicides, killing a wide spectrum, after the application of soybean contact there will be a harmful spot on the leaves, drug damage is slightly more serious than Huwei, is a normal phenomenon, There is no obvious effect on the growth of soybeans, and the new leaves have no phytotoxicity. Need to be mixed with grass weed herbicides.

Kekuile ​​(milfloxacin) herbicides to control broad-leaved weeds, a broad spectrum of herbicides, there will be contact on the leaves of soybean after application of harmful insecticidal spots, drug damage is slightly more serious than weeds, is normal Phenomenon, there is no obvious impact on the growth of soybeans, the new leaves will not be harmed. Need to be mixed with grass weed herbicides.

Acquires net (enesacridine), Ganoderma (clethrone), Securyzide (Phenylpyridamole), Hibiscus (high-efficiency flupirtine), Securinol (quinoline) These five types of herbicides are all herbicides that control grass weeds and have similar herbicidal effects. When weeding perennial grass weeds, we need to use high doses or double the amount.

All five grass weed herbicides can be used in combination with the above four broad-leaved weed herbicides. When mixing, each drug should use the recommended dose, and cannot be reduced. If auxiliaries are added, the dosage can be reduced by 1/4 or 1/3.


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