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Pyrrolnitrin, an antibiotic isolated from  Pseudomonas cepacia,  was used for postharvest control of  B. cinerea  infections on cut `Sonia' and `Royalty' rose flowers. Pyrrolnitrin was applied as a bud dip and followed by inoculation with  B. cinerea  conidia. Dip treatments of 12 to 200 mg·liter -1  pyrrolnitrin significantly reduced disease severity during storage at 2C and promoted post-storage fresh weight gain (an index of cut flower quality). No phytoxicity was observed on leaves or petals at concentrations of up to 200 mg/liter. Dip treatment with 100 mg/liter pyrrolnitrin reduced disease severity to &lt;10% of that on control flowers and prevented post-storage flower rot. This level of disease control was comparable to that achieved with 1800 mg/liter vinclozolin.

POSTHARVEST CONTROL OF BOTRYTIS CINEREA INFECTIONS ON CUT ROSE FLOWERS WITH PYRROLNITRIN.