ABSTRACT

Existing silkworm genetic resources are derived from not only the resultants of the genetic occurred in nature due to genotype and environment reaction but man made alterations through breeding studies also brought up a good number of improved stocks.Evaluating these genetic stocks continuously from time to time, is essential to utilize them for further improvement studies as well as to ascertain their status of maintenance.it will be fair and post-cocoon, so that adequate weightage is given to various characters that are representing different entities of sericulture as a whole.Thirty  one silkworm stocks available at satellite silkworm breeding station coonoor were subjected for such evalusion by multiple trait index method along with a modified multiple trait evaluation index on negative traits.distinct groups on fitness productivity,fiber and crop duration merits were identified,based on these studies twelve breeds viz., A120,A121,B120,European,G146,CJ3P,SPJ2,SPC1,M2,J2P,JA1 and 36PC were selected for amalgamation of fitness, productivity,fibre and shorter larval duration.such comprehensive evalution is of immense value for improvement studies of varying objectives.

Keywords: silkworm genetic stocks,negative trails,comprehensive evalusion.distinct merit groups.