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Nagaraju N

Nagaraju N

University of Agricultural Sciences, India

Title: Molecular characterization, epidemiology and integrated management of Papaya Ringspot Virus (PRSV) in papaya (Carica papaya L.)

Biography

Biography: Nagaraju N

Abstract

Papaya cultivation is worldwide ravaged by Papaya ringspot virus (PRSV) disease. Surveys conducted in Southern Karnataka during 2012-2014 revealed the maximum PRSV incidence in Bangalore Rural (77.53%) followed by Bangalore Urban (68.89%), Kolar (65.00%) and Chikkaballapura (52.78%) districts. Monitoring of the population of different aphid species during August-2013 to July-2014 using yellow sticky traps revealed the occurrence of eight aphid species. Of which, three species viz., Aphis gossypii (66.04%), A. craccivora (26.80%) and Myzus persicae (2.12%) were regularly trapped throughout the year. Transmission studies proved that, M. persicae (53.33%) was more efficient vector in transmitting PRSV followed by A. gossypii (46.66%) and A. craccivora (26.66%). The aphid population was peak when rainfall was below 8.00 mm with temperature range of 17-350C, relative humidity of 30-90% and with wind speed of 3-5km/hr. Based on the symptoms on differential var. Red lady, the PRSV isolates viz., BRD-1, BRH-1, BUH-1 were considered as severe, while MMD-1 and MML-1 as mild isolates. Partial characterization of isolate BUH-1 by CP gene showed highest homology of 98% with South Indian and 87-92% with Asian isolates. Among the defence inducing molecules Salicylic Acid@ 0.002%, Silicic Acid@ 0.2% and Boric Acid@ 0.2% found effective in reducing the disease under field and glasshouse condition. In PRSVdisease management studies, growing papaya as intercrop with African Tall maize (1:1) and Grand Naine banana