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Skeletal formula of clomazone
Ball-and-stick model of the clomazone molecule
IUPAC name
Other names
81777-89-1 YesY
ChEMBL ChEMBL1076356 YesY
ChemSpider 49469 YesY
ECHA InfoCard 100.125.682
Jmol 3D model Interactive image
KEGG C11095 YesY
PubChem 54778
Molar mass 239.69806
Appearance white solid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Clomazone is an agricultural herbicide, and has been the active ingredient of products named "Command" and "Commence". The molecule consists of a 2-chlorobenzyl group bound to a N-O heterocycle called Isoxazole. It is a white solid.

Clomazone was first registered by the USEPA on March 8, 1993 and was commercialized by FMC Corporation. It is used for broadleaf weed control in several crops, including soybeans, peas, maize, oilseed rape, sugar cane, cassava, pumpkins and tobacco.[1] It may be applied pre-emergence of incorporated before planting the crop. Clomazone is relatively volatile (vapor pressure is 19.2 mPa) and vapors induce striking visual symptoms on non-target sensitive plants. Clomazone undergoes biological degradation, exhibiting a soil half life of one to four months.[2] Adsorption of the herbicide to soil solids slows degradation and volatilization.[3] Encapsulation helps reduce volatility and therefore reduces off-target damage to sensitive plants.[4]

Clomazone suppresses the biosynthesis of chlorophyll and other plant pigments.[5][6]


  1. ^ Tomlin, CD. 1997. The pesticide manual, 11th edition. British Crop Protection Council. Farnham, Surrey, UK. p 256-257.
  2. ^ Mervosh, T. L., G.K. Sims, and E.W. Stoller. 1995. Clomazone fate in soil as affected by microbial activity, temperature, and soil moisture. J. Agric. Food Chem. 43:537-543.
  3. ^ Mervosh, T. L., G.K. Sims, E.W. Stoller, and T.R. Ellsworth. 1995. Clomazone sorption in soil: Incubation time, temperature, and soil moisture effects. J. Agric. Food Chem. 43:2295-2300.
  4. ^ Mervosh, T. L., E.W. Stoller, T.R. Ellsworth, and G.K. Sims. 1995. Effects of starch encapsulation on clomazone and atrazine movement in soil and clomazone volatilization. Weed Science. 43:445-453.
  5. ^ Storzer, Werner "The residue behaviour of new herbicides in crop plants" Nachrichtenblatt des Deutschen Pflanzenschutzdienstes 2002, vol. 54, 193-203.
  6. ^ Gara, Pedro M. David; Rosso, Janina A.; Martin, Marcela V.; Bosio, Gabriela N.; Gonzalez, Monica C.; Martire, Daniel O. "Characterization of humic substances and their role in photochemical processes of environmental interest" Trends in Photochemistry & Photobiology 2011, vol. 13, pages 51-70.