GOVERNMENT OF TAMILNADU
DEPARTMENT OF SERICULTURE

Silkworm Races

             The trend of sericulture development in India clearly depicts a quantum jump in mulberry silk production during the last three decades. Renditta (Quantity of Silk Cocoons required to produce 1 Kg of raw silk) in 1960 was as high as 16-17, which came down to 6-7 in 2010. This was possible mainly because of advancement and improvement in mulberry genotypes and cultivation practices.

            Till recently, India had no system of authorisation of silkworm hybrids, which caused undue delay in release of breeds / hybrids evolved by the breeders with great caution. This also deprived industry from the benefits of having wider choice of silkworm hybrids for commercial exploitation.

            Centrak Silk Board (CSB) has brought out a system of Auhorisation of silkworm races. The system involved 14 test centres spread in different regions of the country and test rearings are conducted twice in a year. Popular silkworm hybrids authorised by CSB for commercial exploitation and already in use are given in the following table.

Sl.No

Hybrids

Combinations

Season

States / Region

1

P2D1 x NB18

Mv  x Bv

Winter

Spring

 

 

Summer/ Early autumn

A.P

 

W,B, Assam, Bihar, Orissa, Jharkhand,

M.P, Chattisgarh,

 

U.P, Uttaranchal

2

MY1 x NB18

Mv x Bv

Spring / Autumn

W.B, Assam, Bihar, Jharkhand, Orissa , M.P

3

N x (NB18 x P5)

Mv x Bv

Autumn

 

  Summer/ Autumn

W.B, Assam, Bihar

 

 

Orissa, M.P, Chattisgarh

4

PM x NB18

Mv X Bv

Summer

Assam, Bihar, Orissa, M.P

 

 

5

RD1 x NB18

Mv X Bv

Summer /

E. Winter

U.P, Uttarnchal

6

BL23 x NB4D2

Mv x Bv

Spring / Autumn

Rainfed Areas of Tropics

7

BL24 x NB4D2

Mv x Bv

Spring / Autumn

Irrigated areas of Tropics

8

SH6 x KA

Bv x Bv

Spring / Autumn Spring / Winter

 

 

 

W.B, Assam, Bihar, Orissa, M.P

9

SH6 x NB4D2

Bv x Bv

Spring

U.P, Uttaranchal, J & K

10

CA2 x NB4D2

Bv x Bv

Sring

 

Spring / Autumn/

E. Winter

W.B, Assam, Bihar

 

 

Jharkhand, Orissa, M.P, Chattisgarh

11

NB18 x P5

Bv x Bv

Winter

Assam, Bihar, Orissa, M.P

12

YS3 x SF19

Bv x Bv

Spring

J&K, U.P, Uttarnchal

13

PAM101 x NB4D2

Bv x Bv

Autumn / E.Winter

J&K, U.P, Uttaranchal

14

CC1 x NB4D2

Bv x Bv

Autumn / E.Winter

J&K, U.P, Uttaranchal

15

PAM111 x SF19

Bv x Bv

Autumn / E.Winter

J&K, U.P

16

CSR12 x CSR6

Bv x Bv

Spring / Autumn

Temperate & Tropical Zones

17

CSR18 x CSR19

Bv x Bv

Autumn

Temperate & Tropical Zones

18

CSR16 x CSR17

Bv x Bv

Spring / Autumn

Temperate & tropical Zones

 

 

 

19

CSR3 x CSR6

Bv x Bv

Spring / Autumn

Temperate & Tropical Zones

20

CSR2 x CSR4

Bv x Bv

Spring / Autumn

Temperate & Sub-tropical zones

21

CSR2 x CSR5

Bv x Bv

Sring / Autumn

Temperate & Tropical Zones

22

KS01 x SP2

Bv x Bv

Spring

Temperate Zone

23

SKUAST-1 x SKUAST-6

Bv x Bv

Spring

Temperate Zone

24

APS5 x APS4

Bv x Bv

Spring / Autumn

Temperate & Tropical zones

25

APM1 x APS8

Mv x Bv

Spring / Autumn

Tropical zone

26

BL43 x NB4D2

Mv x Bv

Spring / Autumn

Tropical zone

 

Multivoltine x Bivoltine Silkworm Hybrids

            In India, over 95% of the commercial silk being produced is from Multivoltine female  x  Bivoltine male parent (cross breed) and the existing cross breed Pure Mysore x NB18 / NB4D2 has some limitation specially lower shell wt. high renditta, low cocoon shell ratio and poor fibre quality

            In order to overcome the limitations of PM x NB4D2, new hybrids involving multivoltine breeds have been evolved.

            PM x CSR2 hybrid is meant for irrigated areas in all the seasons and is superior over the existing hybrid in yield, cocoon wt., Shell wt., SR%,filament length, raw silk %, neatness and renditta.