Factors Affecting Spore Liberation byCladosporium carpophilum

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Abstract
Conidial discharge by the peach scab fungus, C. carpophilum, from heavily diseases peach fruits was studied under controlled relative humidity (RH), temperature, wind speed and redinfrared radiation (IR). As RH decreased from near saturation to 40%, spore release was minimal, but further decreases stimulated considerable spore discharge. Sustained periods of constant RH < 40% also favored spore release which was enhanced by exposure to IR (> 40 .mu. E [einstein] .cntdot. m-2 .cntdot. s-1). Spore release was stimulated by short IR exposures (.apprx. 2 min) and brief (2-min) RH changes. Spore release at low RH was increased slightly by vibration, created by dropping a 50-g weight 5 cm onto the specimen chamber, especially when specimens were exposed to IR.