It is important to learn to use a suitable herbicide for different weeds. China Pesticide Network Xiaobian introduces you in detail:
1. Disulfide·Methanesulfuron Trade name: Koshima. Shima and the compounding agent are only suitable for wheat fields, not for wheat fields, corn fields, sugar cane fields, etc. Almost all grass weeds and broadleaf weeds such as wild oats, maiden, bluegrass, sesame, brome, stevia, ryegrass, valerian, japan, hard grass, alkali Mao, sown wormwood, leeks, pork stalks, baocao grass, sorghum, big nest vegetables, thorny vegetables, beef sorghum, mother-in-law, etc. have good control effects.
In the 3~6 leaf stage of wheat, 12g/L dispersible oil agent 45~75g per acre, or 3.6% disulfide·Methanesulfuron-methyl dispersible granule 15~25g plus special aid 80 ml of the agent was sprayed with the stem and leaf.
The sooner the weeds are treated, the better the drug should be used. The application of disulfonate and metsulfuron in winter wheat field should be applied uniformly according to the recommended dosage, period and method, and should not be used in excess of the scope of use. It is strictly forbidden to spray more than many places in the grass, not to spray or leak. Do not use after wheat jointing or planting up to 13 cm. In production, if it is cloudy or rainy, the field is too wet, low-lying water, or wheat seedlings are affected by damage, freezing damage, salinity damage, pests and diseases, and plant malnutrition, it can not be used, otherwise it will easily cause phytotoxicity. Heavy rain and frost within 4 days after application (minimum temperature below 3 °C) will cause phytotoxicity. This medicine cannot be mixed with 2,4-D and long-lasting herbicides. Do not flood the water for 2 days after the medicine to avoid phytotoxicity.
2. Isoproturon Substituted urea-based systemic soil-leaf-leaf herbicide. It is used for wheat field control and weedy weeds and broadleaf weeds such as Mai Niang, Wild Oat, Bluegrass, Valerian, Hard Grass, Niu Fan, Maijiagong, Red Dragonfly, Seeding Artemisia, and Poria.
The soil was sprayed before the sowing of wheat or the stems and leaves of the field weeds were sprayed at the 2~5 leaf stage before the wheat 3 leaf stage to tillering. The dosage is 80% to 110 grams of 75% isoproturon WP, or 120 to 180 grams of 50% isopropyl WP, and 30 to 40 kilograms of water.
The medicated weeds showed chlorosis and yellowing at the tip and leaf margin and eventually died. Isoproturon can be mixed with herbicides such as bensulfuron-methyl that kill broadleaf weeds to expand the herbicidal spectrum and improve the herbicidal effect. When using this medicine, it should be noted that the soil is moist before and after application to achieve the desired efficacy. When the soil is dry, the dosage should be increased; the spray should be evenly distributed. If the application is not uniform, the crop will have a slight phytotoxicity; after the application of isoproturon, there will be some influence on the early growth of the wheat seedling, which is characterized by the yellow color of the wheat seedlings. The plant height is reduced and can be restored later with wheat growth. Spraying plant growth promoters can alleviate the symptoms of phytotoxicity; pay attention to the sudden drop in temperature and sudden drop in temperature, which is prone to phytotoxicity. Excessive rainfall and excessive soil moisture are also prone to wet phytotoxicity. In particular, the method of sowing wheat is more likely to cause phytotoxicity because the roots are exposed.
3. Green merlon replaces urea-based selective absorption-type herbicides . It is used in wheat field to control a variety of grass weeds and some broad-leaved weeds such as Mai Niang, wild oats, alfalfa, sorghum, swine fever, and Po Po.
After the wheat is planted, the soil is sprayed before emergence, or in the 3 leaf stage of the wheat seedlings, the stems and leaves are sprayed before the 1~2 leaf stage of the weeds, and 25% of the green mellon wettable powder per acre is used, 300~50 of the water. Kilogram spray. Three days after the application, the weeds began to show symptoms of poisoning, the leaves were chlorotic, the leaf tips and heart leaves were successively chlorotic, and the whole plant died after 10 days of dryness, and the effect period in the soil was more than 70 days.
Before the application of green mellon to keep the soil moist, the ideal effect can be achieved. The drug should be sprayed evenly. If the application is not uniform, the crop will be slightly phytotoxic, and the performance will be slightly yellowed, and normal growth can be resumed in about 20 days.
4. Prairie Net Triazines are systemic conductive herbicides. Can effectively prevent wheat fields from seeing Mai Niang, foxtail, sorghum, mother-in-law, scorpion and other weeds.
After the sowing, the wheat was sprayed with 50% of the WP of 75-100 grams per mu, and 30 kg of water was sprayed on the surface. After applying the medicine in the dry area, the soil is shallowed 1 to 2 cm to improve the weeding effect.
5. Acetochlor and thiophenesulfuron can effectively control wild oats in wheat fields, see Mai Niang, hard grass, piglets, sown wormwood, baocai grass, sorghum, leeks, mother-in-law, big nest vegetables, thorn vegetables Worm weeds and broadleaf weeds such as cattle.
In the pre-emergence of wheat, 20% acetochlor and thifensulfuron per 100 mu, or 50-70 g of 50% acetochlor and thifensulfuron, and 30-40 kg of water are sprayed on the surface.
The pesticide has good safety to wheat under the condition of better soil moisture, and the herbicidal effect is good, and the amount of the soil with poor soil moisture is reduced to avoid phytotoxicity.
6. Pyrifluentil and isopropyl Trade name: prasug. Mixed herbicide. Applicable to crop fields such as winter wheat, winter barley, corn, beans, sugar cane, etc., can effectively prevent hard grass, see Mai Niang, Japanese look Mai Niang, bluegrass, alfalfa, goosegrass, foxtail, comfrey, fake sorghum Annual anti-branched weeds, such as anti-branched stalks, wild scorpions, cattle scorpion, sown sage, sage, baocao, big nest, sorrel, geranium, piglet, maijiagong, leeks And most broadleaf weeds.
It can be used in the pre-emergence to early-season period after winter wheat sowing, and it is best to use it before the wheat 3~4 leaf stage and the weed 2 leaf stage. Use 55% of pyrfluridic isopropyl suspension per acre to 120~150 ml, and spray evenly on water 40~50 liters. The amount of medication depends on the soil moisture and the application of the drug sooner or later. The earlier the application, the better the soil moisture, the less the amount; if the drug is used later, the weeds are larger, and the soil is more dry, the dosage should be increased appropriately.
The dosage should be accurate, the water consumption should be sufficient, and the spray should be even to prevent the occurrence of phytotoxicity. When the sun is abundant, the temperature is high, and the soil moisture is high, it is beneficial to the effect of the drug, and the soil drought affects the drug effect. The low-temperature effect is slow, and it is easy to cause damage to the wheat seedlings. Generally, the average daily temperature is lower than 8 °C, which affects the effect of the drug, and should not be used before and after the frost.
Other herbicides used in wheat fields to effectively control broadleaf weeds and grass weeds include: benzosulfuron, isoproturon, isoproturon, oxazolone, tribenuron, benzoxazole, and other complexes. With herbicides.
This article is published by the China Pesticide Network , please indicate the source.
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