An epidemic known as “Satsumaimo Motogusare Disease” (サツマイモ基腐病) is causing problems for shōchū makers in Kagoshima Prefecture. Despite being better than the disastrous 2021 production, securing enough sweet potatoes for raw materials remains a challenge, leading to suspended sales and lower production volumes.

In 2022, around 3,500 hectares of fields were affected by root rot symptoms, a significant decrease from the previous year’s 7,686 hectares, but still resulting in an expected incidence rate of 35%.

Tomoya Hiraishi, communication manager at Hamada Distillery (濵田酒造) of Ichiki-Kushikino City, expressed his disappointment, saying, “It’s a pity that we couldn’t resolve the suspension of sales. We have no choice but to apologize to our customers.”

The previous season forced Hamada to reduce preparation amounts, and since April of this year, they have suspended sales of seven items, including large-capacity products of their main brand “Kaidō” (海童). This season, they have managed to secure approximately 80% of the average year’s sweet potato supply. The popularity of baked satsumaimo and other sweets has also intensified demand.

Despite advancing the harvest period, Taikai Distillery (大海酒造) of Kanoya City (鹿屋市) was unable to secure the planned amount of sweet potatoes. Hiroki Kuragasaki, head of the planning and development office, noted that more farmers are giving up satsumaimo cultivation due to frustration with the root rot. The price of the potatoes is rising as a result of competition among manufacturers.

Satsuma Distillery (薩摩酒造) of Makurazaki City (枕崎市), maker of “Shiranami” (白波) and other best-selling sweet potato shōchūs has also struggled to obtain enough raw material and may not achieve their intended production volume this season. While there are no plans to limit shipments, Naoya Honbo, director general of the marketing department, acknowledged the rising prices of various items, stating, “There is a limit to self-help efforts.” All stocks were raised in October, and efforts will continue to ensure a stable supply.