Abstract
A strain of Fusarium oxysporum was isolated from grapevine showing heavy decline disease in a vineyard of Veneto region in Italy. The fungus showed to produce phytotoxic metabolites when grown in liquid culture. The main metabolite was identified as fusaric acid produced for the first time as a phytotoxin by a strain of F. oxysporom isolated from diseased grapevine plants. Its quantification in the fungus cultures filtrates was accomplished by HPLC. When tested on tobacco by leaf-puncture assay fusaric acid at 0.5 mg/mL induced the formation of extensive necrosis.
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