Controlled Atmosphere Effects on the Pathogenicity of Fungi on Celery and on the Growth of Botrytis cinerea

Abstract
Sclerotinia sclerotiorum (Lib.) de Bary and Botrytis cinerea Pers. were highly pathogenic to celery stored at 0° to 1°C in normal air (21% O2). Alternaría dauci (Kuhn) Groves & Skolko, Rhizopus nigricans Ehrenb., Penicillium sp., and Fusarium oxysporum Schlecht, were nonpathogenic. An atmosphere of 7.5% CO/1.5% O2 was more suppressive to disease caused by B. cinerea and S. sclerotiorum than low 1.5% O2 atmosphere alone. The 4% CO2/1.5% O2 and 0.0003% C2H4/1.5% O2 atmospheres were slightly suppressive to disease caused by S. sclerotiorum only. The 7.5% CO/1.5% O2 atmosphere also was consistently suppressive to mycelial growth, spore germination, and germ tube elongation of B. cinerea.

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