INVESTIGATIONS ON DRY ROOT ROT OF PIGEONPEA CAUSED BY Rhizoctonia bataticola (Taub.) Butler
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Date
2016-07-30
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University of Agricultural Sciences Raichur
Abstract
Pigeonpea is an important pulse crop in India. Among biotic stresses dry root rot is
attaining severity in pigeonpea production. The roving was survey was conducted during
October- November 2015 in North Eastern parts of Karnataka reveled that maximum
incidence of dry root rot in gulberga (24.72 %) followed by Raichur (17.78 %) and least
in Yadgir district. Twenty four isolates of Rhizoctonia spp. were collected from different
locations of four districts. All the isolates of Rhizoctonia sp. varied considerably with
regard to cultural and morphological characters. The maximum radidal growth was
observed in PDA (Non synthetic media) 89.67 mm of the pathogen and more sclerotial
production was observed, whereas oat meal broth showed maximum dry mycelia weight
(468.21 mg). The maximum per cent germination and vigour index of 917.14 was
recorded in T. viride (Tri-25) treated seeds. And maximum peroxidase activity (0.84
change in the absorbence at 420nm/mm/µg protein) was recoreded in P. fluorescence
(RP-46) + Rb-9. In case of PPO and PAL, the maximum activity (1.12 change in the
absorbance at 495 nm/min/mg protein) and 30.25 nmol transcinnamic acid/hr/mg/protein)
of defence enzymes is recored respectively. Genotypes GRG-177, GRG-811, ICP-14832,
AGL-1666 and ICP-8793 showed resistant reaction. T. viride (Tv-B) was found more
effective and inhibition of maximum fungal growth (77.20%). Fungicides like ziram
(Nonsystemic) among systemic and combi fungicides, tebuconazole, carbendazim 12% +
mancozeb 63% WP, trifloxystrobin 25 % + tebuconazole 50 % EC, carboxin 37.5 % +
thiram 37.5 % WP showed 100 per cent inhibition all the concentrations viz.,
(0.1, 0.2, 0.3 %) tested.
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