Cyhalofop-butyl is indeed an excellent variety of rice field chemical control. It is highly safe for rice and high-efficiency and low residue for grass weeds. It is well received by the majority of growers and contributes a lot to chemical weeding in China. However, the current use of cyhalofoprin in rice rotten and over-dosage in China accelerates the resistance of grass weeds in China, thereby greatly shortening the life of cyhalofop. Cyhalofop is the only species of aryloxyphenoxypropionic acid herbicide that is highly safe for rice. Like other varieties, it is also a systemic herbicide. It is absorbed by the leaves and sheaths of the plant body, and the phloem is transmitted, accumulates in the meristematic zone of the plant, and resists acetyl-CoA carboxylase (ACCase), which stops the fatty acid synthesis, and the cell growth and division cannot proceed normally. Destruction of the lipid structure eventually leads to plant death. The absorption from cyhalofoprin to weeds is relatively slow and usually takes 1-3 weeks. The symptoms of weeds after application are as follows: the buds in the four-leaf stage shrink and cause death. The old leaves in the two-leaf stage are extremely small and remain green. It has excellent selectivity to rice, etc., and selectivity is based on different metabolic velocities. In rice, cyhalofoprin can be rapidly degraded into a diacid state which is inactive to acetyl-CoA carboxylase, and thus has a high degree of rice. safety. Because of its rapid degradation in soil and typical paddy fields, it is safe for crops. Mainly used to control important grass weeds. Cyhalofop-butyl ester is highly effective against thousands of gold, and has certain control effects on young psyllium. It can also control, crabgrass, double-spotted gar, foxtail, goosegrass, and maiden. Ineffective for sedge weeds and broadleaf weeds. Cyhalofop-butyl is characterized by its high safety to rice and its high efficiency, low toxicity and no residue to grasses such as Qianjin, with the continuous expansion of rice live area and the resistance of grass weeds to cyhalofop. Sex and drug resistance increased, and the amount of use increased year by year. In 2016, it replaced the heptazone of penoxsulam and has developed into the largest variety of rice. There are 234 registrations of cyhalofop-butyl ester in China, and the registration content is 10%, 15%, 20%, 25%, 30%, 40%. The registered dosage forms are emulsifiable concentrate, water emulsion, dispersible oil suspension agent and wettable powder. Etc., the registration range is the rice live field, and the registered objects are mostly thousands of gold and valerian. Cyhalofop-butyl ester is widely used in the southern and Yangtze River basins of China. The market is hot and hot. The weed-resistant areas have increased the dosage to 60 grams of active ingredients, and the effect is not satisfactory. For better use of cyanoflufen Products, to extend their lives, combined with market research and my practical experience, the following recommendations for the precise use of cyhalofop-butyl ester: (except of course the market is known as enhanced cyhalofop-butyl ester) 1. Select the standard dosage form: Since the original drug of cyhalofop-butyl ester is white crystalline solid, the specific gravity is 1.2375 (20 ° C), the boiling point is 363 ° C, the melting point is 48-49 ° C, and the vapor pressure is 8.8×10 (-9) mmHg (20 ° C). , soluble in most organic solvents: acetonitrile 57.3%, methanol 37.3%, acetone 60.7%, chloroform 59.4%, insoluble in water and other physical properties, the effect of processing dosage forms on the efficacy of the drug is different, the same effective ingredient dosage, dosage form effect It is expressed as emulsifiable concentrate > dispersible oil suspension agent > water emulsion > wettable powder. 2, the selection of content: preparation processing is generally processed from the original drug + additives + solvent + filler and other materials, due to the different solubility of cyhalofop-butyl ester in different solvents and the need for the necessary additives, in the processed dosage form A certain amount of additives should be added to improve the efficacy. Different dosages and additives are different in dosage, scientific and reasonable in formula, and additives must be added in order to exert the best effect of the active ingredients. Ingredients dosage, in general, the dosage form effect is 10%>15%>20%>25%>30%>40%, except for special additives. 3. Selecting the period of drug use: the different leaf ages of weeds have different sensitivity to cyanuric acid ester. As the leaf age increases, the sensitivity decreases, and the dosage also increases. Generally, the leaf age is small and the dosage is small. The age of the leaves is also large. The registered dosage is generally 1.5-2 leaves (experts can be separated), the amount is small, 10% 60-70ml, 15% d 30-50ml, 20% 25-35ml, 25% 24- 30ml, 30% 20-25ml, 40% 15-20ml, this leaf age rice and thousands of gold production farmers are difficult to distinguish, when equalization, thousands of gold are generally in the 4-5 leaves, if still registered The dosage is difficult to achieve the desired effect, and the dosage must be increased. Therefore, the prevention of thousands of gold in the case of the same amount of cyhalofopride should be small and should not be large. Since cyhalofop-butyl ester is highly safe for rice, cyanofluoroacetate can be used to control thousands of gold after direct seeding of rice 2-3 leaves. If the aliquot is cleared, it is the rice 3-5 leaf period. To see the macroscopic effect of cyhalofop-butyl on the gold, the rice 3-4 leaves are the best time to control the thousand gold. 4, the selection of the right dose: cyhalofop-butyl ester has been promoted in China for more than 10 years, thousands of gold also produced a certain resistance to cyhalofop-butyl ester, increase the dosage to achieve the desired effect, in areas with strong resistance to thousands of gold The active ingredient of cyhalofoprin in the range of 30-50 grams (30-50 grams in the southwest of Jiangxi, Hubei Public Security, Huangmei, etc., the effect is not ideal) in the less resistant areas, the minimum dosage It also reaches more than 20 grams of active ingredient. Cyhalofop-butyl is popular in the past for the control of older sedge and resistant valerian. The amount of the old direct-release rice area is large, and the dosage of the new direct-seeded rice area is lower. The normal amount of active ingredients varies from 20 to 30 grams. 5. Selection of drug-using technology: Cyhalofop-butyl is a systemic herbicide that must be absorbed by stems and leaves, and transmitted in the body of weed plants, acting and growing points to exert its effects. Whenever possible, the weed plants should be in full contact with the drug solution. When using cyhalofoprin in rice, it is necessary to drain first, so that the weed plants are exposed more than 2/3, and the high concentration is evenly sprayed, and the water is rehydrated for 24 hours to fully absorb and conduct the liquid. In conclusion, cyhalofop-butyl is indeed an excellent variety of chemical control in rice fields. It is highly safe for rice and high-efficiency and low-residue for grass weeds. It is well received by farmers and contributes a lot to chemical weeding in China. However, the current use of cyhalofoprin in the rotten and over-dosage of rice in China accelerates the resistance of grass weeds in China, thus greatly shortening the life of cyhalofop-butyl ester. It takes a lot of manpower to develop a good compound. Material resources, and a long period of time, cherish the research results of the ancestors, scientifically and rationally guide the use of drugs, advocate closed drugs, reduce the number of weeds, reduce the amount of drugs and the number of drugs, delay the generation of weed resistance, and rotate with different mechanism compounds, Extend the life cycle of cyhalofop-butyl ester to achieve precise drug use. More pesticide knowledge , please pay attention to China Pesticide Network
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