Many crops are stored for several months before they are sold and consumed. Low temperature storage of pome fruit, grapes, and carrots is the preferred method of preserving these crops although even under these conditions they are subject to decay by several plant pathogens (Eckert and Ogawa 1988). The storage life of many crops depends on treatment with an antifungal agent. Most postharvest fungi- cides are applied by either drenching, line sprays or by fumigation. Fumigants have many attributes that make them effective pesticides. Bond (1973) states that fumigants can diffuse through space and penetrate into protected places that are inaccessible to liquid or solid pesticides. Table grapes are fumigated with sulfur dioxide in storage, every 7 days to prevent the spread of Botrytis cinerea from infectedberries (Luvisi et al. 1992). Initial fumigation requires a higher rate of sulfur dioxide than subsequent treatments in order to control spores on the grape surface (Smilanick and Henson 1992). The use of sulfur dioxide fumigation on grapes and other crops such as litchi is not without prob- lems, the foremost being it leaves undesirable residues (Sivakumar et al. 2007). It has no affect on established infections and can produce off-flavors and bleached skin spots on the berries (Narayanasamy 2006). For reasons such as these research has continued on the search for fumigants with antimicrobial properties. Acetaldehyde vapor at 0.5% (v/v) controlled blue mold of apples caused by Penicillium expansum when applied for 2 h (Stadelbacher and Prasad 1974). The fungicidal action was shown to be a function of concentration and exposure period. Mattheis and Roberts (1993) tested acetaldehyde, propanol, and butanal on