10.22376/ijpbs.2019.10.1.p1-12 Volume 2 Issue 4 2011 (October - December) Silkworm lessThan i greaterThan Bombyx mori lessThan /i greaterThan is an important economic insect and also a tool to convert leaf protein into silk. The industrial and commercial use of silk, the historical and economic importance of production and its application in all over the world finely contributed to the silkworm promotion as a powerful laboratory model for the basic research in biology. The mulberry leaf is the only important source of the silkworms. The present study has been undertaken to the effectiveness of foliar applications of silver nanoparticles (AgNps) (25%) and single cell protein (SCP) containing microalgae lessThan i greaterThan Spirulina lessThan /i greaterThan (0.03%) treated MR lessThan sub greaterThan 2 lessThan /sub greaterThan mulberry leaves fed with the popular Indian bivoltine hybrid (CSR2×CSR4) silkworm lessThan i greaterThan B. mori lessThan /i greaterThan larvae (3 lessThan sup greaterThan rd lessThan /sup greaterThan , 4 lessThan sup greaterThan th lessThan /sup greaterThan and 5 lessThan sup greaterThan th lessThan /sup greaterThan instar) to study the larval growth and development (length, width and weight) and economic parameters like cocoon (length, width and weight) shell and pupal weight were significantly increased than control group. This study was indicated that the AgNps and lessThan i greaterThan Spirulina lessThan /i greaterThan exhibit the presence of certain growth stimulant and can be used to increase the silk yield in commercial silkworm rearing. Ganesh Prabu P., senthamarai Selvi . E, Selvisabhanayakam, Mathivanan V, Pradhap M And Vivekananthan T Bombyx mori, Silver Nanoparticles (AgNps), Spirulina, Mulberry leaves. 180-189