Jingyou (R Jingsong) is an artificial-feed-adapted silkworm variety developed through hybridization and backcrossing between Chinese-line, broad-feeding strains and Jingsong A, followed by selective breeding under artificial-feed rearing conditions. It belongs to the Chinese strain group, exhibits diapause, and has four instars.
The young larvae are dark brown, highly mobile, and exhibit uniform dormancy and arousal; their body color is pale bluish-white with widespread speckling. Larvae at all instars feed vigorously, enter dormancy relatively quickly, develop uniformly, and maintain a well-proportioned body shape. Mature mulberry leaves should be used to ensure that the silkworms are fully fed on high-quality foliage.
Huakang No. 3 is a new spring–rearing, high–silk–yield variety developed by the Sericulture Research Institute of the Chinese Academy of Agricultural Sciences through crossbreeding Jingsong and Haoyue as maternal parents and introgressing genes that confer strong resistance to Bombyx mori nucleopolyhedrovirus (BmNPV).
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