Dr. T.O. Sasidharan

Honorary Fellow

Education

  • 1986 Ph.D (Zoology) University of Jodhpur, Jodhpur (Rajasthan)
  • 1976 M.Sc (Zoology) University of Kerala, Trivandrum
  • 1973 B.Sc (Zoology) University of Calicut, Kerala

Research Interests

I am basically an insect pathologist specialized in microbial diseases of insects. I was involved in sericulture research for over 22 years and my area of specialization is silkworm diseases and their management. During my research career in the Central Silk Board, Govt. of India, I was all through involved in research projects on microbial diseases of silkworm, especially the fungal and microsporidian diseases with the specific objective of developing appropriate disease control technologies for enhancing sericulture crop production.

Taking lessons from my experience in the field of microbial diseases of silkworm, I have, of late, developed interest in employing potential microbes, especially fungi and microsporidia for insect pest management. In the current scenario of the growing concern world over, about the adverse effects of indiscriminate use of hazardous chemical pesticides on the environment, bio-control methods using entomopathogenic microbes are increasingly being appreciated and advocated. Nature has built-in mechanisms to conserve, regulate and maintain the biota it holds. Many types of micro organisms survive in nature, which have evolved several specialized and intricate relationships with their natural hosts and also the environment. Biological control, in a way, takes care of conservation of species, because, the organisms exploited for bio-control are reasonably target specific and operate in tandem with the principles of population dynamics. Bio-control precisely means biological intervention to curtail any prolific build up of a potentially dangerous pest species that could inflict serious economic damage on any commercial agriculture or plantation venture. Total extermination of any invasive species is never the goal of any bio-control programme. Instead, managing a potentially noxious pest species below the Economic Injury Level (EIL) is the objective. The methods employed, though involve some degree of extrapolation, are more often in line with the mechanisms operating in nature. They could therefore be the right choice in the interest of preserving the rich biodiversity of our ecosystems, because the candidate organism for the purpose is always picked taking into consideration its specificity in regard to the target pest species. Potentially pathogenic microbes, therefore, can be judiciously exploited for bio-control of insect pests without disturbing the pathogen-host system operating in nature, as also the several other biotic components of the ecosystem. I am currently pursuing a research project on developing a mycoinsecticide based on Metarhizium, a potential entomopathogenic fungal organism capable of causing natural epizootics among insect populations. I sincerely feel that bio-control has always conservation embedded in it and should be promoted for sustainable ecosystem management in the present context of the fast deterioration of several of our vibrant natural ecosystems.

Experience

Work Experience

  • Senior Research Assistant - at the Central Sericultural Research &Training Institute, Mysore (Central Silk Board, Govt. of India)
  • Senior Research Officer - at the various research and development institutes of the Central Silk Board, Govt. of India)
  • Scientist A - at the Andhra Pradesh State Sericulture Research and Development Institute, Hindupur (Govt. of A.P)
  • Principal Investigator - DBT project "Development, augmentation of efficacy and improvement of dissemination systems of Metarhizium based mycoinsecticide for the management of major pests in forest plantations and nurseries"
  • Principal Investigator - DST project "Investigations on Microsporidia affecting forest Lepidoptera of South India and their prospects as bio-control agents"

Projects completed

  • Studies on Nuclear Polyhedrosis of silkworm with special reference to management of the disease in silkworm crops
  • Development of improved diagnostic and management methods for Pebrine disease of silkworm
  • Demonstration of "Reshamkeet Oushadh" in the field for control silkworm diseases - DBT aided project
  • Studies on Pebrine disease of silkworm with special emphasis on diagnosis and control methods

Projects currently pursuing

  • Development, augmentation of efficacy and improvement of dissemination systems of Metarhizium based mycoinsecticide for the management of major pests in forest plantations and nurseries - DBT project (sanctioned)
  • Investigations on Microsporidia affecting forest Lepidoptera of South India and their prospects as bio-control agents - DST (approved)

Grants / Awards / Honors

  • Recipient of the Seth Beldeodas Shah award Instituted by the Central Silk Board (Govt. of India), for outstanding contribution in the field of Sericulture research.
  • Involved in the development of a novel processing technology for production of a silkworm bed disinfectant which is commercialized by the Central Silk Board and patented by Govt. of India.

Complete Publications

Research Papers

  • Sasidharan, T.O., R.N. Singh and M.V. Samson (2000). Efficacy of a new silkworm bed disinfectant "Resham Jyothi" under field conditions. Indian J. Sericulture, 39, 41-42.
  • Samson, M.V., P.C. Santha, R.N. Singh and T.O. Sasidharan (1999). Microsporidian spore isolated from Pieris sp. Indian Silk, 38, 5-8.
  • Samson, M.V., P.C. Santha, R.N. Singh and T.O. Sasidharan (1999). A new Microsporidian infecting Bombyx mori L. Indian Silk, 37, 10-12.
  • Singh, R.N., M.V. Samson, T.O. Sasidharan and P.C. Santha (1998). Studies on the infectivity and rate of multiplication of Nosema bombycis in relation to different temperature in silkworm, Bombyx mori L. Proc. Curr. Tech. Seminar, Bangalore.
  • Sasidharan, T.O. and M.V. Samson (1993). Bleaching Powder: An effective disinfectant in Sericulture., Indian Silk, 103, 21-22.
  • Samson, M.V., R.N. Singh and T.O. Sasidharan (1998). Resham Jyothi - A wide spectrum Bed disinfectant. Indian Silk, 37, 9-10.
  • Sasidharan, T.O., R.N. Singh and M.V. Samson (1997). Efficacy of a new silkworm disinfectant " Resham Sanjeevani" against incidence and spread of diseases in silkworm crops under field conditions. Proc. Curr. Tech. Seminar, Berhampore, July 1997.
  • Remadevi, O.K. and T.O. Sasidharan (1997). Biological control of Uzi fly. Indian Textile Journal, 107.
  • Samson, M.V., T.O. Sasidharan and R.N. Singh (1996). Pebrine - Monitoring and Disease Management Strategies, Indian Silk, 35, 21-24.
  • Biram Saheb, M.V. Samson, T.O. Sasidharan and J.P. Gaur (1996). Silkworm Seed Production. Indian Textile Journal, 106, 66-70.
  • Remadevi, O.K., U.C. Abdurehiman and T.O. Sasidharan (1996). Notes on the host range of Goniozus nephantidis (Hymenoptera: Bethylidae) with a new report on Anigraea albomaculata (Lepidoptera: Noctuidae) as an alternate host. Entomon, 21, 281-282.
  • Singh, R.N., T.O. Sasidharan, V. Suryanarayana and M.V. Samson (1995). Chemosterilisation in Sericulture. Indian Textile Journal, 105, 134-136.
  • Sanha, P.C., R.N. Singh, T.O. Sasidharan and M.V. Samson (1995). Cross infectivity of Microsporidians from lepidopterans to silkworm, Bombyx mori L. and its occurrence in the progeny population. Proc. Curr. Tech. Seminar, Bangalore 1995, 43-44.
  • Singh, R.N., T.O. Sasidharan, M.V. Samson, B.P. Nair and P.C. Santha (1995). Replication of Nosema bombycis Nageli spores in the silkworm, Bombyx mori L. In relation to development of pupae and age of moths and its impact on successive generation. Proc. Curr. Tech. Seminar, Berhampore. October 1995, 4-5.
  • Samson, M.V., B.P. Nair., R.N. Singh, V. Suryanaraya and T. O. Sasidharan (1995). Standardistion of sample frame for the estimation of larval density in silkworm, Bombyx mori L. Proc. Curr. Tech. Seminar, Berhampore. October 1995, 21-22.
  • Nair, B.P., R.N. Singh, T. O. Sasidharan and M.V.Samson (1995). Impact of repeat survey on basic seed farms and grainages in Tamil Nadu and Andhra Pradesh. Proc. Curr. Tech. Seminar, Bangalore. December 1995, 58-59.
  • Sasidharan, T.O. and M.V. Samson (1995). Pebrine - monitoring, prevention and control. Proc. Curr. Tech. Seminar, Bangalore. November 1995, 27-32.
  • Remadevi, O.K., U.C. Abdurehiman and T.O. Sasidharan (1995). A new method for observing the hatching, moulting and determining the number of larval instars in Goniozus nephantidis Mues. (Hymenoptera: Bethylidae). Entomon. 20, 45-47.
  • Samson, M.V., T.O. Sasidharan, R.M. Singh, P.C. Santha, V. Suryanarayana, A. Manjula and Chandrashekaraiah (1995). Efficacy of the disinfectant 'Disfect-S' against pathogens of the silkworm, Bombyx mori. Madras Agric. J., 82, 93-98.
  • Sasidharan, T.O., M.V. Samson, Govindaiah and R.N. Dutta (1995). Effect of antibiotics on Streptococcus faecalis infection in the silkworm, Bombyx mori L. Bull. Sericult. Res., 5, 53-57.
  • Singh, R.N., T.O. Sasidharan, B.P. Nair, M.V. Samson, and P.C. Santha (1995). Effect of Nosema bombycis infection on some reproductive traits and spore replication in the silkworm, Bombyx mori. Bull. Sericult. Res. 6, 65-69.
  • Sam Devadas, C., T. O. Sasidharan, M.V. Samson, V. Sivaprasad and R.K. Datta (1994). Infectivity of Serratia marcescens to the silkworm, Bombyx mori L. (Lepidoptera: Bombycidae) and its effect on certain biochemical constituents in the haemolymph and gut. Sericologia. 34, 275-281.
  • Remadevi, O. K., T.O. Sasidharan and U.C. Abdurehiman (1994). Ovisite preference of Goniozus nephantidis Mues (Hymenoptera: Bethylidae), Insect Sci. Applic., 15, 439-443.
  • Sasidharan, T.O., R.N. Singh, M.V. Samson, A. Manjula, P.C. Santha and Chandrasekharaiah (1994). Spore replication rate of Nosema bombycis (Microsporidia: Nosematidae) in the silkworm, Bombyx mori L in relation to pupal development and age of moths. Insect Sci. Applic., 15, 427-431.
  • Singh, R.N., T.O. Sasidharan and M.V. Samson (1993). Reshamkeet Rog Nivaran. Indian Silk, 31, 56-57.
  • Sasidharan, T.O. (1993). Disinfection and hygiene in grainages. Proc. Workshop on Grainage Management. January 1993, 19-23.
  • Baig, M., M.V. Samson, S.D. Sharma, M. Balavenkatasubbiah, T.O. Sasidharan and M.S. Jolly (1993). Efficacy of certain bed disinfectants in different combinations against Nuclear Polyhedrosis and White Muscardine of the silkworm, Bombyx mori L. Sericologia. 33, 53-60.
  • Baig, M, S.D. Sharma, M. Balavenkatasubbiah, M.V. Samson, T.O. Sasidharan and M.K. R. Noamani (19910. Relative susceptibility of different races of silkworm, Bombyx mori L to Nuclear Polyhedrosis under natural and induced conditions. Sricologia. 31, 417-420.
  • Baig, M., M. Balavenkatasubbiah, S.D. Sharma, B.D. Singh, T.O. Sasidharan and M.K. R. Noamani (1990). Field trials of Reshamkeet Oushadh on the cocoon yield of the silkworm, Bombyx mori L. Sericologia, 30, 543-546.
  • Samson, M.V., M. Baig, S.D. Sharma, M. Balavenkatasubbiah, T.O. Sasidharan and M.S. Jolly (1990). Survey on the relative incidence of silkworm diseases in Karnataka, India. Indian J. Sericulture, 29, 248-254.
  • Sasidharan, T.O., S.P. Goyal., Phool chand and P.K. Ghosh (1990). The effect of water deprivation and salt load on water conservation efficiency in two Indian desert gerbils. J. Comp. Physiol .B, 160, 413-422.
  • Baig, M., M.V. Samson, S.D. Sharma, M. Balavenkatasubbiah, T.O. Sasidharan and M.S. Jolly (1988). Effect of certain disinfectants as surface sterilants against Pebrine in surface contaminated layings. Sericologia 28, 81-87.
  • Baig, M., M.V. Samson, T.O. Sasidharan, S.D. Sharma, M. Balavenkatasubbiah and M.S. jolly (1988). Study on the spread of Pebrine after introduction of transovarially infected worms in a colony of silkworm (Bombyx mori L.), Sericologia 28, 75-77.
  • Goyal, S.P., P.K. Ghosh, T.O. Sasidharan and Phool Chand (1988). Body water relations in two species of gerbils (Tatera indica indica and Meriones hurrianae) of the Indian desert . J. Comp. Physiol B. 158, 127-134.
  • Sasidharan, T.O and P.K. Ghosh (1982). Effect of water deprivation in winter on certain blood and urinary constituents in the Indian Gerbil, Tatera indica indica. Proc. Indian Natn. Sci. Acad. B48, 97-108.
  • Sasidharan, T.O. and P.K. Ghosh (1981). Synergistic action of Testosterone propionate and Oestradiol benzoate on male genitalia in the Indian gerbil, Tatera indica indica. Indian J. Exp. Biol., 19, 972-974.
  • Sasidharan, T.O., (1981). Effect of Steroid hormones on the reproductive system of male Indian gerbil, Tatera indica indica. Rodent Newsletter. 5, 1.
  • Sasidharan, T.O (1980). Effect of lead acetate and testosterone propionate on male genitalia in the Indian Gerbil, Tatera indica indica. Annals of Arid Zone, 19, 126-131.
  • Khan, M.S., T.O. Sasidharan and P.K. Ghosh (1979). Glomerular filtration rate and blood and urinary urea concentrations in Barmer goats of the Rajasthan desert. J. Agrc.Sci., Camb., 93,247-248.
  • Khan, M.S., T.O. Sasidharan and P.K. Ghosh (1979). Water regulation in Barmer goat of the Rajasthan desert. Experientia, 35, 1185-1186.
  • Khan, M.S., T.O. Sasidharan and P.K. Ghosh (1978). Water economy of the Barmer goat of the Rajasthan desert. J. Arid Environments. 1, 351-355.
  • Khan, M.S., T.O. Sasidharan and P.K. Ghosh (1978). Effect of acute water restriction on plasma proteins and blood and urinary electrolytes in Barmer goats of the Rajasthan desert. J. Agric. Sci. Camb., 91, 395-398.

Contact

Email: tosasi@atree.org