STUDIES ON Rhizoctonia bataticola (Taub.) Butler INCITING DRY ROOT ROT DISEASE IN PIGEONPEA
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Date
2022-12-29
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Abstract
Pigeonpea is the second most important pulse crop in India. The crop suffers from many
diseases, of which dry root rot is gaining importance in recent years due to changes in climatic
conditions. Rhizoctonia bataticola (Taub.) Butler was isolated using standard tissue isolation
protocol from the infected tissues and pathogenicity was proved by blotter paper technique and
sick pot method. The survey was undertaken in the Doddaballapura taluk of Bangalore district
and disease incidence was recorded in the range of 0 to 25 per cent. Cultural studies revealed that
’ (PDA) and
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pathogen was observed at pH 6.0 and 7.0. The PCR amplification and sequencing of internal
transcribed spacer (ITS) and specific regions confirmed R. bataticola as the cause of dry root rot
disease. Among bioagents, Trichoderma viride (TV), T. viride (TV 2) and Pseudomonas
fluorescens (Pf-O) were more effective in inhibiting the growth of R. bataticola. Contact
fungicides captan, mancozeb and zineb; systemic fungicides, tebuconazole followed by
propiconazole; and combiproducts, Mancozeb 63% + Carbendazim 12%, Iprovalicarb 5.5% +
Propineb 61.5%, Tricyclazole 18% + Mancozeb 62% and Tebuconazole + Trifloxystrobin 75%
were found to be effective against R. bataticola. Among sixty-seven pigeonpea genotypes, none
of the entries showed a resistant reaction, whereas two genotypes viz., BRG 5×ICP 7035-1-3 and
BGR5×TS3-R-10-1 showed a moderately resistant reaction and the remaining 65 genotypes
showed a susceptible reaction.
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