1927 — The Muscat Bailey A Cross

What Happened

In 1927 (Shōwa 2), Zenbei Kawakami at Iwanohara Vineyard in Jōetsu, Niigata, performed cross-breeding experiment #3986 — the 3,986th of the eventual 10,311 documented crosses he would conduct over his career. The parents:

• Bailey (American hybrid, imported by Kawakami in 1898) — provided disease resistance, cold tolerance, and Japan-climate adaptability
• Muscat Hamburg (European Vitis vinifera, a black-skinned table grape with distinctive Muscat aromatics) — provided wine quality, color depth, and aromatic character

The seedling vines from cross #3986 fruited for the first time in 1931. Kawakami evaluated the resulting wine over the next several years, working with University of Tokyo fermentation scientist Kinichirō Sakaguchi on chemical and sensory analysis. The cross was eventually selected, named, and added to the published canon of recommended varieties in 1940.

What It Produced

The selected variety became Muscat Bailey A — a black grape with:

• Deep purple-black color
• Distinctive strawberry-cotton-candy aromatic from elevated furaneol levels (a Bailey-family trait)
• Moderate tannin
• High acid, food-friendly structure
• Excellent cold and disease tolerance for Japanese conditions

By the postwar decades, Muscat Bailey A had become Japan’s most-planted black wine grape. By 2013 the variety was registered with the OIV — the first Japanese black grape to achieve that international recognition.

Why It Matters

Cross #3986 is the single most consequential breeding event in Japanese wine history. The variety that resulted — Muscat Bailey A — has shaped:

• Japan’s domestic red-wine consumption pattern (the country’s most-recognized red grape)
• The country’s export identity (alongside Koshu, the second internationally-recognized variety)
• The cultural framing of Japanese-bred wine grapes as legitimate fine-wine inputs (rather than merely table grapes)

Almost every contemporary Japanese red wine that is not made from a European variety traces — directly or by adjacency — to the 1927 Iwanohara cross.

Details

• Year: 1927 (Shōwa 2)
• Location: Iwanohara Vineyard, Jōetsu, Niigata
• Cross number: #3986
• Parents: Bailey (♀) × Muscat Hamburg (♂)
• First fruit: 1931
• Published as recommended: 1940 (Kawakami + Sakaguchi)
• OIV registered: 2013