alexa EVALUATION AND SELECTION OF SUPERIOR BIVOLTINE HYBRIDS


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Research Article

EVALUATION AND SELECTION OF SUPERIOR BIVOLTINE HYBRIDS OF THE SILKWORM BOMBYX MORI L. FOR TROPICS THROUGH LARGE SCALE INHOUSE TESTING

Dayananda1*, S B Kulkarni2, P Rama Mohana Rao3, O K Gopinath4 and S Nirmal Kumar5
  1. Central Sericultural Research and Training Institute, Mysore, Karnataka, India.
  2. Central Sericultural Research and Training Institute, Mysore, Karnataka, India.
  3. Central Sericultural Research and Training Institute, Mysore, Karnataka, India.
  4. Central Sericultural Research and Training Institute, Mysore, Karnataka, India.
  5. Central Sericultural Research and Training Institute, Mysore, Karnataka, India.
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Abstract

Bivoltine silk excels in quality and productivity but do not display the crop stability in the field. The main reason attributed to such instability is that the bivoltines suffer badly in adverse conditions, prevailed in the field. In order to study the potentiality of newly developed bivoltine hybrids under simulated conditions of farmers before recommending them for field evaluation the present study was taken. In the present study six new bivoltine hybrids developed at Central Sericultural Research and Training Institute (CSRTI), Mysore along with the control hybrid were assessed under simulated conditions of farmers in a large scale at CSRTI for their various economic traits. The hybrids evaluated expressed a varied degree for the economic traits over the control hybrid, CSR2 x CSR4. Among the hybrids evaluated two hybrids recorded the average multiple traits evaluation index value of more than 50 viz., CSR50 x CSR51 (67.25) and D2 x D13 (53.84). Further these new hybrids recorded higher improvement over control in respect of cocoon yield (28.17 and 10.81 %), single cocoon weight (18.59 and 4.75 %), cocoon shell weight (25.65 and 7.591 %), cocoon shell percent (6.00 and 2.66 %) and filament length (18.13 and 6.53 %). Further the cocoons of these two hybrids have exhibited uniformity in cocoon size. Overall data indicate the superiority in the performance of CSR50 x CSR51 and it has profound influence in expressing the full potentiality in the field compared to other hybrids studied.

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