The present invention relates to crystalline forms of [3-(4,5-dihydro-3-isoxazolyl)- 2-methyl-4-(methylsulfonyl)phenyl]-(5-hydroxy-1-methyl-1H-pyrazol-4-yl)methanone, which is also known by the common name topramezone. The invention also relates to a method for the production of these crystalline forms, and to formulations which contain one of these crystalline forms of topramezone for protecting plants.
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