Influence of larval density as stress factor for rearing of CSR hybrid silkworms
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Author:K.M. VIJAYA KUMARI, M. BALAVENKATASUBBAIAH, R.K. RAJAN, M.T. HIMANTHARAJ, B. NATARAJU AND M.REKHA
p-ISSN:0024-9602, e-ISSN:2582-5321, Vol:87, Issue:oct-dec
DOI: https://doi.org/10.29321/MAJ.10.A00513
Abstract
Newly evolved productive bivoltine hybrid CSR2 x CSRS rearing was conducted with differentie larval densities ranging from 50 larvae / sq.ft to 100 larvae / sq.ft in fifth instar. The cocoon character, a t cocoon yield and disease incidence was recorded with optimum rearing conditions as well as in the presence of 1 per cent infectious source (Flacherie and Grasserie). The results revealed that the cocoon characters were significantly improved and diseases incidence were reduced under low densityrearing (50 & 60 larvae/ sq.ft). However, there was no significant difference between 50 & 60 larvae/sq.ft. treatments with regard to spread of flacherie and grasserie
Key words : Cocoon characters, Disease incidence, Disease spread, Flacherie, Grasserie, Larval density