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Effects of Album-based formulae such as garlic juice (GJ) and the extracts of ethanol (GAE) and ethyl ether (GEE), onion juice (OJ) and the ethanol extract (OAE), garlic juice+Merit Blue (G+M), ethanol extract of garlic juice+Merit Blue (GAE+M), onion juice+Merit Blue (O+M), ethanol extract of onion+Merit Blue (OAE+M), and Merit Blue (M) on budbreak, flowering, and maturity of ´Delaware´ grapes were studied for the establishment of techniques in forcing culture of ´Delaware´ grapes under plastic houses. M alone or in combination was effective for hastening the budbreak in respective early and late forcing culture in ´Delaware´ . But percent budbreak was decreased by the treatment. Flowering in ´Delaware´ was hastened by single or double application of M. Differences of flowering date between early and late forcing culture were 10 and 6 days in double application, and 9 days in single application, respectively. Harvest date in early forcing culture was hastened by all treatments, and especially 13 or 11 days were hastened by single application of G+M or double application of M, respectively. Therefore, single application of GAE+M or double application of OJ was effective in late forcing culture of ´Delaware´ grapes.
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