title: Breeding of a Silkworm Variety for Synnemata Production of Isaria tenuipes.
abstract: This study was conducted out to select a silkworm variety suitable for synnemata production of Isaria tenuipes. Four kinds of the mulberry silkworm varieties, Bombyx mori, were hybridized using a Japanese parental line and a Chinese parental line, and used to test for synemata formation in I. tenuipes. The larval period of normal silkworms was 22 hr longer than the silkworms inoculated with this fungus. Among the silkworm varieties tested, Hachojam had the shortest larval period with 23.02 days. The non-cocooning silkworm had a shorter larval period than the cocoon producing silkworms. The pupation rate of normal silkworms was about 9% higher than that of silkworms sprayed with I. tenuipes. Hachojam had the highest infection rate at 99.8%, but no significant difference was observed for the infection rate by silkworm variety. The production of synnemata was the best in JS171 × CS188 with an incidence rate of 99.3%, followed by Hachojam, and Chugangjam. The synnemata produced from Hachojam were the heaviest and showed white or milky-white in color.
authors: National Academy of Agricultural Science, Rural Development Administration, Suwon 441-707, Korea.
authors: Pil-Don
authors: PD
authors: Kang
authors: Gyoo-Byung
authors: GB
authors: Sung
authors: Kee-Young
authors: KY
authors: Kim
authors: Mi-Ja
authors: MJ
authors: Kim
authors: In-Pyo
authors: IP
authors: Hong
authors: Nam-Gyu
authors: NG
authors: Ha
keywords: Bombyx mori; Isaria tenuipes; Spraying; Synnemata