Purity >98%. Fusaric acid is a picolinic acid derivative first isolated from fungi of the genus Fusarium . It is transformed to an N-methylamide derivative by many plant species infected by the mold. Both fusaric acid and fusaric acid methylamide are thought to contribute to the toxicoses developed from ingesting mold-infested feeds. Fusaric acid can also synergize the toxicity of trichothecenes in certain assays.