EVALUATION AND SELECTION OF POTENTIAL PARENTS TOLERANT TO BOMBYX MORI NUCLEAR POLYHEDRO VIRUS (BMNPV) FOR DEVELOPMENT OF DISEASE RESISTANT HYBRIDS
|L. Vijaya Lakshmi, P. Sujathamma and V. Sivaprasad*
Dept. of Sericulture, Sri Padmavathi Mahila Viswa Vidyalayam, Tirupathi-517 502, Andhra Pradesh, India
|Corresponding Author: V. Sivaprasad, E-mail: [email protected]|
|Received: 09th Jan-2014 Accepted: 21st Jan-2014|
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Bombyx mori Nuclear polyhedrosis virus (BmNPV) causes nuclear polyhedrosis in silkworm which is one of the dominant viral diseases noticed in almost all sericultural areas in the country. The tolerance in silkworm breeds have physiological and genetic origins that are controlled by polygenes. The present work relates to the evaluation and selection of silkworm breeds tolerant to BmNPV among the germplasm stocks available at Andhra Pradesh state Sericulture Research and Development Institute (APSSRDI), Hindupur. The silkworm breeds were inoculated with the viral suspension of (2 x 106/ml) BmNPV PIB’s by smearing onto mulberry leaves @ 1ml/100 larvae. Eleven bivoltine oval and nine bivoltine peanut silkworm breeds exhibiting real tolerance to BmNPV infection were shortlisted and further evaluated under three trials. Based on the overall mean performance and economic merit over the three trials, 5 each of bivoltine oval and peanut silkworm breeds were identified as potential resource material for further breeding programme.