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The effectiveness of fungistatic atmospheres for postharvest control of Botrytis cinerea Pers. infections on cut rose flowers (Rosa hybrids L.) was investigated. Storing cut 'Sonia', 'Royalty', and 'Gold Rush' roses at 2.5C with 10% CO2 for 5 days, followed by 2 days of cold storage in air, reduced the number of B. cinerea lesions that developed on inoculated and noninoculated flower petals by 77% and 82%, respectively, compared to cold storage for 7 days in air. Higher CO2 concentrations and longer CO2 treatment times reduced disease severity further, but resulted in unacceptable leaf discoloration on some cultivars. No deleterious effects of CO 2-enriched storage atmospheres on flower quality, weight gain, or vase life were observed. Storage at 2.5C for 7 days in 2 µl SO 2/liter reduced B. cinerea infections on inoculated and noninoculated flowers by 53% and 43%, respectively. No deleterious effects on flower quality, weight gain, or vase life were observed. Higher SO 2 levels reduced disease severity further, but caused bleaching of the petal margins and necrosis around leaf wounds. Botrytis cinerea is a serious pathogen of rose flowers and other cut flower crops. Infections first appear as water-soaked spots or flecks on the flower petals. As the lesions coalesce, the infected petals turn brown and wither. Eventually, the entire flower may rot off at the receptacle. B. cinerea infections often cannot be detected at harvest, but develop rapidly under the moist conditions encountered during storage and transit. Such infections cause major postharvest losses and are considered a limiting factor in the storage and shipment of cut flowers (Carre, 1984; Cline and Bardsley, 1984; McCain and Welch, 1982). Low storage temperatures slow the development of B. cinerea infections (Maude, 1980), but do not always provide adequate control for long-term storage or when inoculum loads are high. At present, many rose growers dip cut flowers in fungicides to prevent postharvest development of B. cinerea infections, but this practice leaves unsightly residues on the flowers and foliage (McCain and Welch, 1982). Fungistatic atmospheres are used to control B. cinerea infec- tions on certain commodities during storage and shipment (Maude, 1980). The atmospheres can be applied in storage rooms or shipping containers and do not leave the unsightly residues as- sociated with most fungicide dip treatments. Carbon dioxide- enriched atmospheres are used to minimize Botrytis rot of straw- berry fruit during truck shipment (Harvey, 1982). Phillips et al. (1985) found that atmospheres containing 10% to 30% CO2 significantly reduced Botrytis flower rot of roses stored at 10 to 12C for 6 days, but Joyce and Reid (1986) reported foliar dam- age to 'Sonia' roses after storage for 7 days at 1C in CO 2 con- centrations as low as 7%. Sulfur dioxide-enriched atmospheres are used to control de- diluted to 1000/ml in deionized water, and sprayed onto the

Postharvest Control of Botrytis cinerea Infections on Cut Roses Using Fungistatic Storage Atmospheres