Weed control with soil applied kih485, smetolachlor, acetochlor, flufenacet and dimet henamidp in corn at lamberton, mn in 2003. Pdf gcecd analysis of smetolachlor dual gold in cotton. Smetolachlor has more of the sisomer pair in each pound due to a selective manufacturing process, i. S metolachlor ec 96% ww was applied as preemergence at dosages of 1,500. The renantiomer is less active, and modern production methods afford a higher concentration of s metolachlor, thus current application rates are far lower than original formulations. It has also been found in a number of surface water samples in 14 states, at a maximum concentration of 0. In formulations, its color ranges from opaque white to tan. Metolachlor has the chemical formula c100 15 h 22 no 2 cl and a molecular weight of 283. Whats the difference between metolachlor formulations. Drexel chemical company performance of metolachlor products. Standard for smetolachlor active constituent australian. The following active ingredients are covered by this reregistration eligibility.
Metolachlor cas 51218452 aquatic crustacea ec50 water flea daphnia magna 18. Metolachlor and smetolachlor metolachlor including other mixtures of constituent isomers including smetolachlor sum of isomers mrls annex ii classification reg. Smetolachlor exposures resulted in significantly reduced radicle development p\0. When metolachlor 960 ec is applied to dry beans or grain sorghum the seed must be treated with effective fungicides to control seedling.
Gcecd analysis of s metolachlor dual gold in cotton plant. The mechanism of action is inhibition of plant protein synthesis and. This regulation establishes tolerances for the residues of s metolachlor in or on multiple commodities which are identified and discussed later in this document. Compliance with the tolerance levels specified in the following table below is to be determined by measuring only the sum of free and bound smetolachlor, s2chloron2ethyl6methylphenyln2methoxy1methylethylacetamide, its renantiomer, and its metabolites, determined as the derivatives, 22ethyl6methylphenylamino1propanol. In field trials carried out 19951996 smetolachlor demonstrated equivalent. Advice as to strategies and alternative treatments that can be used should be obtained from your local supplier, consultant, local department of agriculture, primary industries department or a 4farmers representative. S metolachlor is a chiral compound comprised of 88% s enantiomer and 12% renantiomer shaner et al, 2006. The interregional research project number 4 ir4 requested these tolerances under the federal food, drug, and cosmetic act ffdca. The old dual in the early 1990s was two isomers of metolachlor, r and s isomers. The story of s metolachlor michigan state university.
Degradation of smetolachlor in soil as affected by. Jmpr 2005 food and agriculture organization of the united nations. Interregional research project number 4 ir4 requested these tolerances under the federal food, drug, and cosmetic act ffdca. Pdf the effect of elapsed time between spraying and first leaching event on the. Gcecd analysis of s metolachlor dual gold in cotton. This regulation establishes tolerances for residues of s metolachlor in or on multiple commodities which are identified and discussed later in this document. Now that there are a lot of generic versions out there it has become confusing.
Metolachlor was detected in about 1% of the wells about 60,000 wells at concentrations ranging from 0. Reregistration eligibility decision epa web archive. Nomenclature of smetolachlor and its regulated derivatives. Smetolachlor contains predominantly the sisomer of metolachlor 6. The degradation rate of smetolachlor in soils under different conditions was determined based on the residual levels of the spiked herbicide after incubation. Mesotrione, acetochlor, and atrazine for weed management. Metolachlor is miscible with most organic solvents. Metolachlor, referred to as alpha metolachlor, is a racemic mixture of 50% each of renantiomer and senantiomer us epa, 2001. In field trials carried out 19951996 s metolachlor demonstrated equivalent efficacy on major grass weeds and tolerance to. Identification of the chemical product and company supplier. S metolachlor is the senantiomer of 2chloron 2ethyl6methylphenyln 1methoxypropan2ylacetamide.
Declared content in gkg or gl at 20 c tolerance above 100 up to 250 above 250 up to 500 above 500. Metolachlor 960 ec damage to dry beans is sometimes associated with hot, dry weather and a ploughsole in the soil. Once the active ingredient in dual and bicep herbicides that was used for weed control in corn, syngenta replaced it with s metolachlor, which it maintains is a completely different active ingredient that is used in dual ii magnum and bicep ii magnum. Following pre emergent application seedlings fail to emerge.
When metolachlor 960 ec is applied to dry beans or grain sorghum the seed must be treated with effective fungicides to control seedling diseases, such as pythium spp. Osborn 1993 ir ferrocenyl diphosphine catalysts 19934 patents of rac. S metolachlor exposures resulted in significantly reduced radicle development p\0. It is a member of the chloracetanilide chemical family, with a molecular weight of 283. I have been asked by a few people about the differences in metolachlor the active ingredient in dual products. Acetochlor and pendimethalin alone, s metolachlor plus mesotrione, and the threeway combination of s metolachlor plus atrazine plus mesotrione provided the most consistent control of annual. A common moiety method of analysis has been developed for metolachlor that involves. There are smetolachlor or metolachlor products and smetolachlor plus benoxacor safen or metolachlor plus benoxacor safen products. Smetolachlorpc code 108800sygenta crop protection, inc. Identity substance name smetolachlor casnumber 87392129. Illustration of the increased efficacy of the s metolachlor isomer on creeping bentgrass agrostis stolonifera using dose response curves. Finalised in the standing committee on the food chain and animal health at its meeting. Smetolachlor is a mixture of the s and rformats in an approximate ratio 88.
Why choose dual magnum brand herbicides over generic metolachlor. S metolachlor is an important selective herbicide used for control of broadleaf and annual grassy weeds in a wide range of crops such as peanut, cotton, soybean, maize, and tomato. In studies using rats, metolachlor caused a significant increase in liver nodules and carcinomas in high dose females. Oct 21, 2008 s metolachlor s 2chloron2ethyl6methylphenyln2methoxy1methylethyl acetamide is a selective, chloroacetanilide herbicide that is applied to a variety of crops as a preplant, ppi, preemergence, or postemergencedirected application, primarily for the control of grass weeds. A new catalyst system developed allows the commercial production of enantiomericallyenriched smetolachlor iso draft common name.
The dual ii included a safener to improve crop safety improves safety to corn, not to broadleaf crops. Metolachlor 720 herbicide to control the resistant weeds. Metolachlor, smetolachlor and their role within sustainable. It is not always apparent what formulation is used or if a product has a safener. Metolachlor technical fao specification 400tcs 1991. Some naturally occurring weed biotypes resistant to 4farmers metolachlor 720 herbicide and other amide herbicides may exist through normal genetic variability in any weed. Review report for the active substance smetolachlor. Weed control with soil applied kih485, smetolachlor. Metolachlor, smetolachlor and their role within sustainable weed. Metoolachlor ii is a herbicide for use as a preplant surfaceapplied, preplant incorporated or preemergence treatment in water or fluid fertilizer for control of most annual grasses and certain broadleaf weeds in corn field, pop, sweet, cotton, peanuts, pod.
Metolachlor is a chloroacetanilide type herbicide that is applied for preemergent control of grasses and broadleaf weeds on agricultural crop land, including corn, soybeans, sorghum and other crops, and on noncrop land for general weed control. Apr 28, 2014 i have been asked by a few people about the differences in metolachlor the active ingredient in dual products. Phytotoxicity of atrazine, smetolachlor, and permethrin. Why choose dual magnum brand herbicides over generic. Metolachlor technical fao specification 400tc s 1991. It is absorbed by plants and inhibits plant protein synthesis. This site is supported in part by the crop protection and pest management program grant no. Fao tentative specifications code st, formerly ts are those which have been. When metolachlor 915ec is applied to dry beans, ensure that the seeds are treated with effective fungicides to control seedling diseases. Herbicide trade name, common name, formulation, mode.
Food and agriculture organisationsustainable development and environment. The analytical method of s metolachlor residue and its degradation in cotton and soil in trial field were investigated. Smetolachlor s2chloron2ethyl6methylphenyln2methoxy1methylethyl acetamide is a selective, chloroacetanilide herbicide that is applied to a variety of crops as a preplant, ppi, preemergence, or postemergencedirected application, primarily for the control of grass weeds. Some of the biggest herbicide confusion exists in the metolachlor area. S metolachlor 1970 discovery of biological activity 1978 fullscale plant 20000 ty 1982 bioactivity of s enantiomers detected 1983 first attempts to make s metolachlor 1985 rh cycphosubc vancouver 1987 ir diphosphine f. S metolachlor s 2chloron2ethyl6methylphenyln2methoxy1methylethyl acetamide is a selective, chloroacetanilide herbicide that is applied to a variety of crops as a preplant, ppi, preemergence, or postemergencedirected application, primarily for the control of grass weeds. Metolachlor and metolachlor degradates ethanesulfonic acid. Organization of the united nations, or on the part of the world. Pdf leaching of smetolachlor, terbuthylazine, desethyl. The renantiomer is less active, and modern production methods afford a higher concentration of smetolachlor, thus current application rates are far lower than original formulations. Following post emergent application seedlings are deformed. Metolachlor 800 label e arysta lifescience south africa.
The 2015 weed control guide for ohio, indiana and illinois has been published the issues concerning the performance of metolachlor products like metoolachlor, metoolachlor ii and trizmet ii vs. Metolachlor is a member of the chloroacetanilide class of herbicides. Metolachlor, referred to as alpha metolachlor, is a racemic mixture of 50% each of renantiomer and s enantiomer us epa, 2001. The soil and the plant samples were collected at different intervals and the residues of smetolachlor were analyzed by.
Analysis of smetolachlor, metolachlor esa, and metolachlor. No treatmentrelated cancer effects were observed in two studies using mice. Smetolachlor provides the same level of weed control at a 35 percent lower rate than generic. The objective of this study was to evaluate soil applied corn herbicides for annual grass and. Smetolachlor 1970 discovery of biological activity 1978 fullscale plant 20000 ty 1982 bioactivity of s enantiomers detected 1983 first attempts to make smetolachlor 1985 rh cycphosubc vancouver 1987 ir diphosphine f. The first edition of the fao specifications manual was published in 1971 as fao. Smetolachlor products like dual 8e, dual ii magnum and bicep ii magnum have been resolved. S metolachlor is a mixture of the s and rformats in an approximate ratio 88. The soil and the plant samples were collected at different intervals and the residues of smetolachlor were analyzed. Pure metolachlor is an odorless, offwhite to colorless liquid at room temperature. Metolachlor 51218452 100 designates that a specific chemical identity andor percentage of composition has been withheld as a trade secret. Impact of maize formulated herbicides mesotrione and s. The solubility of metolachlor in water is 530 ppm at 20c. On receipt of the draft specifications and supporting information for a.
Some contain both isomers, others contain only the sisomer and are usually designated as s metolachlor. Soil in each tapered bottle was spiked with smetolachlor at a concentration of 6 mg kg1 if not specified. Compliance with the specifications does not constitute an endorsement or warranty. In field trials carried out 19951996 s metolachlor demonstrated equivalent efficacy on major grass weeds and tolerance to different maize cultivars at 65% the use rate of metolachlor. The chemical name for metolachlor is 2chloron2ethyl6 methylphenyln2methoxy1methylethyl acetamide.
Summary report for smetolachlor summary substance name smetolachlor casnumber 87392129 proposed freshwater quality standard aaqs macqs water 0. Compliance with the tolerance levels specified in the following table below is to be determined by measuring only the sum of free and bound s metolachlor, s 2chloron2ethyl6methylphenyln2methoxy1methylethyl acetamide, its renantiomer, and. An emulsifiable concentrate herbicide plus safener for the preemergence control of most annual grasses and certain broadleaf weeds in maize and other crops as indicated. For weed resistance management this is a group k herbicide. Smetolachlor ec 96% ww was applied as preemergence at dosages of 1,500 and 2,250 ml ha. Compliance with the tolerance levels specified in the following table below is to be determined by measuring only the sum of free and bound smetolachlor, s2chloron2ethyl6methylphenyln2methoxy1methylethyl acetamide, its renantiomer, and. Sep 20, 2007 the analytical method of smetolachlor residue and its degradation in cotton and soil in trial field were investigated.
Nations fao concerning the legal or development status of any country, territory, city or area or of its authorities, or concerning. Under study conditions, terbuthylazine and smetolachlor showed the highest leaching potentials. The objective of this study was to evaluate soil applied corn herbicides for annual grass and annual broadleaf weed control in corn. Gcecd analysis of smetolachlor dual gold in cotton plant and soil in trial field article pdf available in environmental monitoring and assessment 143. These levels may result from runoff during spring and summer applications to fields 101. A stimulatory effect for coleoptile development was noted in the.
There are s metolachlor or metolachlor products and s metolachlor plus benoxacor safen or metolachlor plus benoxacor safen products. Identity substance name smetolachlor casnumber 87392129 substance group herbicidechloroacetanilide. Compliance with the specifications does not constitute an endorsement or warranty of. When metolachlor 915ec is applied to dry beans, ensure that the seeds are treated with effective fungicides to control seedling diseases caused by pythium spp. Once the active ingredient in dual and bicep herbicides that was used for weed control in corn, syngenta replaced it with smetolachlor, which it maintains is a completely different active ingredient that is used in dual ii magnum and bicep ii magnum. Metolachlor 915ec damage to dry beans is sometimes associated with hot, dry weather and a ploughsole in the soil.
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