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One aspect of the present invention is concerned with a composition containing: (A) at least 10 μg of particular substituted pyrroles per kg of dry matter; and (B) at least 100 mg per kg of dry matter of a pyranone selected from the group consisting of maltol, 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one and combinations thereof; which composition, when dissolved in water at a dry solids

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