According to "Kaiko No Shuruigo", the bivoltine Kasuri that has been reared by Baba Yuki of Ihoku village, Fukushima Prefecture in around 19th year of Meiji(1886) is an ancestor of "Tadamiko". Sato Jingoro of Ihoku village took over the silkworm eggs from Baba Yuki, and improved it. The improved race had graceful cocoon and large weight of cocoon filament. It was said "Jingoro Summer Rearing Silkworm". The uneven growth of larva was a fault of "Jingoro Summer Rearing Silkworm". Sanbei Tomisaku, Hasebe Daisaku and anothers improved the race, and obviated the fault mentioned above in around the 32nd year of Meiji(1899). That race was named "Tadamiko" in the 37th year of Meiji(1904) with being used widely. Tadamiko had large healthiness of larva, good reelability of cocoon and glossiness of the raw silk, and was used widely in Aizu district of Fukushima Prefecture. There are different views on the origin, voltinism and so forth of Tadamiko. They are as follows:
(1) The view of Suzuki Tokujiro of Fukushima Prefecture. (He was a possessor of Tadamiko.)
Tadamiko was fixed from the hybrid between Tsuchihako and a univoltine race by Sato Jingoro of Ihoku village, Fukushima Prefecture. It was said "Jingoroko" at the beginning, "Nankomaru" in the 29th year of Meiji(1896), and was renamed "Tadamiko" in the 38th year of Meiji(1905). And the Tadamiko was univoltine Japanese race.
(2) The view of Tamura Matajiro of Hokkaido (He was a possessor of Tadamiko.)
Tadamiko was selected by Kanke Shigesaburo, who came from Tadami, Ihoku village of Fukushima Prefecture. Tadamiko was a univoltine Japanese race, that had been reared in Hokkaido from old times. (Note: Kanke Shigesaburo producted excellent silkworm eggs of Tadamiko in the Meij era(1868-1912)).
(3) Sanbei Tomisaku of Fukushima Prefecture possessed the univoltine Japanese that had normal body marking and peanut cocoon shape.
(4) Sericultural Experiment Station of Fukushima Prefecture possessed the parent eggs of F1 hybrid those were fixed Japanese-Japanese, bivoltine race, and were for spring rearing.
Production of Tadamiko in Japan(in the 5th year of Taisho(1916)) 20,000 moths (It is presumed that one moth will hatch 400 eggs.)
1) Eikichi HIRATSUKA(1961) : History of Modern Silkworm Race Breeding, Dainippon Silk Foundation, Silk Science Research Institute, pp236
2) Eikichi HIRATSUKA(1969) : Genealogy of Japanese Silkworm Races for Practical Use, Dainippon Silk Foundation, Silk Science Research Institute, pp335