Evaluation of Thermotolerant Bivoltine Silkworm Breeds through Cocoon Yield and Filament Characteristics against Beauveria bassiana (Bals-Criv.) Vuill. Inoculation
K. P. Sahana *
Department of Sericulture, UAS, GKVK, Bengaluru-560 065, India.
Manjunath Gowda
Department of Sericulture, UAS, GKVK, Bengaluru-560 065, India.
K. C. Narayanaswamy
Department of Sericulture, UAS, GKVK, Bengaluru-560 065, India.
S. Chandrashekhar
Department of Sericulture, UAS, GKVK, Bengaluru-560 065, India.
*Author to whom correspondence should be addressed.
Abstract
Silkworm, Bombyx mori L. being a poikilothermic insect is susceptible to both biotic and abiotic factors. The present study was carried to assess the performance of few thermotolerant bivoltine silkworm breeds under high temperature treatment (36 ± 1⁰ C for 6 hours) and Beauveria bassiana (Bals-Criv.) Vuill. inoculation (6.86 ̕X 104 spores / ml @ 0.5 ml / silkworm). Seven thermotolerant bivoltine silkworm breeds viz., B1, B2, B4, B6, B8, APS12, and APS45 and two popular bivoltine breeds, CSR2 and CSR4 breeds and one popular multivoltine breed Pure Mysore were utilized for the study. Among the thermotolerant breeds studied, the breed B4 was found to perform better with respect to cocoon yield by number, cocoon yield by weight, average filament length, filament weight under both high temperature treatment and B. bassiana inoculation. CSR4 breed was found to be least performer for all the parameters. Therefore, the breed B4 can be a better parent for hybridization and improvement under both the stress conditions.
Keywords: Bivoltine silkworm breeds, cocoon yield, filament length, high temperature treatment, Beauveria bassiana
How to Cite
Downloads
References
Keerthana A, Manjunath Gowda, Narayanaswamy KC, Amaranatha N. Post cocoon traits of thermotolerant bivoltine silkworm breeds as affected by white muscardine, Mysore J. Agri. Sci., 2019; 53(2):1-8.
Dandin SB, Giridhar K. Handbook of Sericulture Technologies. CSB Publcations. 2014;1-427.
Sudhakara Rao P, Datta RK, Basavaraja HK. Evolution of a new thermotolerant bivoltine hybrid of the silkworm (Bombyx mori L.) for tropical climate. Indian J. Seric. 2006;45(1):15-20.
Keerthana A, Manjunath Gowda, Narayanaswamy KC. Performance of thermotolerant bivoltine silkworm breeds for larval growth and cocoon yield parameters under Beauveria bassiana infection. Mysore J. Agri. Sci. 2019; 53(1):19-26.
Sundarraj N, Nagaraju S, Venkataramu MN, Jagannath MK. Designs and analysis of field experiments. University of Agricultural Sciences, Bangalore, India. 1972;424.
Kumari SS, Subbarao SV, Sunil Mishra, Murthy US. Screening strains of the mulberry silkworm, Bombyx mori L. for thermotolerance. J. Insect Sci. 2011;11 (6):1-14.
Lakshmi H, Chandrashekaraiah. Identification of breeding resource material for the development of thermotolerant breeds of silkworm, Bombyx mori L. J. Exp. Zool. India. 2006;10(1):55-63.
Keerthana A, Manjunath Gowda, Narayanaswamy KC, Amaranatha N. Some thermotolerant bivoltine silkworm breeds tolerate white muscardine diseases caused by Beauveria bassiana (Bals.-Criv) Vuill. infection. Int. J. Chem. Stud. 2020; 8(4):86-94.
Sahana KP, Manjunath Gowda, Narayanaswamy KC, Chandrashekhar S. Response of identified thermotolerant bivoltine silkworm breeds for Beauveria bassiana (Bals-Criv.) Vuill. infection: A source for thermal and fungal dual stress resistance. Mysore J. Agri. Sci. 2021; 53(3):56-68.
Suresh Kumar N, Basavaraja HK, Kishor Kumar CM, Mal Reddy N, Datta RK. On the breeding of CSR18 × CSR19, a robust bivoltine hybrid of silkworm, Bombyx mori L. for the tropics. Int. J. Indust. Entomol. 2002;5(2):153-162.
Suresh Kumar N, Basavaraja HK, Mal Reddy N, Dandin SB. Effect of high temperature and high humidity on the quantitative traits of parents, foundation crosses, single and double hybrids of bivoltine silkworm, Bombyx mori L. Int. J. Entomol. 2003;6(2):197-202.
Suresh Kumar N, Basavaraja HK, Joge PG, Mal Reddy N, Kalpana GV, Dandin SB. Development of a new robust bivoltine hybrid (CSR46 × CSR47) of Bombyx mori L. for the tropics. Indian J. Seric. 2006; 45(1):21-29.
Lakshmi H, Chandrashekharaiah, Ramesh Babu M, Raju PJ, Saha AK, Bajpai AK. HTO5 × HTP5, the new bivoltine silkworm (Bombyx mori L.) hybrid with thermotolerance for tropical areas. Int. J. Plant Anim. Environ. Sci. 2011;1(2): 88-104.
Seema KD, Priti MG, Shubhangi SP, Vitthalrao BK. The influence of infection of Beauveria bassiana (Bals) Vuill, a fungal species (Family: Clavicipitaceae) on quality of the cocoons spun by the larval instars of Bombyx mori (L) (Race: PM x CSR2). J. Bacteriol. Mycol. 2019;7(1):14-18.
Rajitha K, Savithri G. Studies on symptomological and economic parameters of silk cocoons of Bombyx mori inoculated with Beauveria bassiana (Bals.) Vuill. Int. J. Curr. Microbiol. App. Sci., 2015;4(2):44-54.