Author(s):

Pallavi MS, Ramappa HK and Poonam Singh

Abstract: Pigeonpea sterility mosaic virus infection on pigeonpea occurs in a severe form in its growing areas of Karnataka and considered as green plague of pigeonpea and transmitted by vector eriophyid mite Aceria cajani Channabasavanna. In an effort to greater understanding of the epidemics of PPSMV in this environment during the year 2013, various epidemiological factors were examined, especially the effect of different sowing months with variety ICP8863 on per cent disease incidence and mite population, weather factors, age of host in disease development, effect of popular varieties on Sterility Mosaic Virus Disease incidence and alternate sources of PPSMV. The fluctuation in Disease Incidence and mite population was recorded throughout the year and early stage of crop growth recorded less disease incidence with lower mite population and gradual increase was recorded at later stage of crop growth period. August and September sown crop recorded higher disease incidence and mite population where the mean temperatures were 25.12 ⁰C, 23.08 ⁰C and relative humidity of 70.64 per cent, 73.84%, respectively. The Disease incidence recorded at different months of sowing had a significant positive correlation with mite population. Pigeonpea plants inoculated up to age of 30 days showed complete sterility with 100% disease incidence. The Resistant genotypes recorded less per cent disease incidence and symptom development at 60DAS. Whereas susceptible variety recorded maximum diseases incidence at early stage of crop growth and showed complete sterility. PPSMV and its vector survived on the ratooned pigeonpea plants and its wild relatives Atylosia scaraboeides during off season. The results demonstrated the different epidemiological factors in the level of PPSMV infection and can be used to recommend modifying the sowing dates as a means to escape the disease in the SMD hot spot regions.

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