Persimmon ‘Taishu’ In 1977, ‘IIiG-16’ (‘Jiro’ × ‘Okitsu No. 15 persimmon’ (‘Evening It is a sweet oyster cultivar with extra-large fruit, which was bred by crossing Gosho-gaki’ × ‘Hana-gosho-gaki’)) and was registered as a seedling in 1995. The peak harvest period for ‘Taishu persimmon’ in the growing area (Akitsu Town, Higashi-Hiroshima City, Hiroshima Prefecture) is early November, which is the same period as ‘Matsumoto Wase fuyu persimmon’, and is 1-1 to 20% higher than ‘Fuyu persimmon’. 2 weeks earlier, the fruit skin color at the harvesting stage is less likely to turn orange-red to orange-red like ‘Matsumoto early Fuyu persimmon’ or ‘Fuyu persimmon’, and the persimmon color chart value (produced by the Fruit Tree Experiment Station of the Ministry of Agriculture, Forestry and Fisheries) is about 5 to 5.5. 20). In addition, ‘Taishu persimmon’ loses astringency faster than other completely sweet persimmon varieties, and can be eaten earlier than the original ripening period, so it is easy to pick early. It has been pointed out from early on that the quality of the fruit has deteriorated. The peak harvest season for ‘Taishu persimmon’ at our institute is the end of October, about 10 days earlier than ‘Matsumoto early Fuyu persimmon’ and about 20 days earlier than ‘Fuyu persimmon’, and the harvest season is from late October to early November. 8).
It seems that the facility-grown persimmon “Taishu” can be shipped in December due to the vinyl coating in early October every year. In open-field cultivation of the persimmon “Taishu”, the shipment ends in mid-November, so it seems that the development of technology to extend the shipping period for use in gift products in December was desired. Therefore, the Kumamoto Prefectural Agricultural Research Center Fruit Tree Research Institute (Toyofuku, Matsubashi-cho, Uki City, Kumamoto Prefecture) seems to have established a shipping extension technology through restrained cultivation that covers vinyl at the beginning of coloring (early October). The restrained cultivation of “Taishu”, which is covered with vinyl in early October, raises the temperature around the fruit, delaying the coloration of the fruit and allowing him to harvest and ship in December. In addition, it seems that it was found that fruits with late coloration are suitable for the fruits to be shipped in December. Compared to open-field cultivation, restrained cultivation delays the coloration of the fruit and has a longer shelf life, making it possible for him to ship in December. The temperature in the greenhouse of controlled cultivation seems to be 0.8°C higher on average and 3.3°C higher than that of open-field cultivation. In late October, the coloration progressed. In fact, it seems that the rate of softening on the tree before harvesting is high. The texture (crispy feeling) of the harvested fruits decreases as the number of days after harvesting passes, but it is. It seems that the later the coloration of the fruit in season, the more the texture can be maintained. In restrained cultivation, in order to increase the temperature inside the greenhouse, the sides are covered with vinyl, and the inside of the greenhouse is ventilated so that the temperature does not exceed 30°C. Fruits with streaks, anthracnose, etc., and fruits that color quickly are likely to soften on the tree before harvesting, so it is advisable to try to harvest early.
The shipment of Jiro persimmons, which are characterized by their square, flat shape, crunchy texture, and rich sweetness, has begun in Toyohashi City, the country’s top producer of persimmons. According to JA Toyohashi, we can expect a big harvest in 2022. It is a type of astringent persimmon with a square shape and no seeds. It is called by other names in various places, such as Niigata’s Hatchin persimmon, Yamagata’s Shonai persimmon, Sado’s Okesa persimmon, and Tanenashi persimmon.