mefenpyr-diethyl is a chemical product with molecular formula C16H18Cl2N2O4.Molecular weight 373.2311Molecular formula C16H18Cl2N2O4CAS number 135590-91-9Store sealed at 0-6 ºCChinese alias (RS)-1-(2, 4-dichlorophenyl) -5-methyl-2-pyrazolin-3, 5-dicarboxylate diethyl esterPyrazole hydrochlorides and hydrochlorides are used in combination with various aroxyphenoxypropionic acids and sulfonylurea herbicides to control weeds in wheat, rye, rye and some barley fields. It was developed by Agrevo (now Bayer Cropscience) under the development code AE F107892 and was first reported for use with methyliodosulfuron in 1999, replacing its predecessor hydroxazole. Pyrazolate was first registered in 1994. Pyrazolidin can be used as a safety agent for (fine) oxazolidin (e.g., Imtrade Maddog Selective Herbicide), methyl iodosulfuron sodium salt (e.g., Hussar), methyl disulsulfuron (e.g., Atlantis), and sulfursulfuron.The volume ratio of benzoxazoline to pyrazolate was 11∶3. The volume ratio of methyl iodosulfuron sodium salt to pyrazolate was 1∶3. The volume ratio of methyl disulsulfuron to pyrazolide was 1∶3. There is no fixed ratio of herbicide to pyrazolate. Generally speaking, the amount of pyrazolate required to ensure the safety of herbicides is 20 to 100 g a.i./hm2. There are the following problems in the mixed use of pyrazolate and herbicide :(1) The pyrazolate has a protective effect on the target weed of methyldisulsulfuron, which can improve its drug resistance and reduce the control effect of methyldisulsulfuron on the weed. Therefore, the mature methyldisulfonon formulation needs to add synergistic additives. (2) The absorption site and conduction direction of the compound in the plant are very specific. At present, the effect of pyrazolysis is through the absorption of stem and leaf spray, but the effectiveness of pyrazolysis in other parts of the crop has not been reported. (3) The melting point of pyrazolysis is 50~52℃, which belongs to the low melting point of the original drug. The problems of delamination, solidification and decrease of suspension rate are easy to occur when the low melting point raw drug is made into suspension agent.Storage methodSeal and store at 0-6 ºCMain use1. It is a safety agent for wheat, barley, and methyl disulfononPackage