INTEGRATED MANAGEMENT OF SHEATH BLIGHT (Rhiizoctoniia sollanii Kuhn) OF RICE.
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Date
2019-07-15
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CSKHPKV, Palampur
Abstract
The iinvesttiigattiion on “Inttegratted managementt of sheatth blliightt (Rhiizocttoniia
sollanii Kuhn) of riice” was underttaken duriing 2017-19 iin tthe Departtmentt of Pllantt
Patthollogy,, CSK HPKV,, Pallampur.. Sheatth blliightt patthogen was iisollatted from iinfectted
riice pllantts and patthogeniiciitty was proved.. Among siix organiic amendmentts,, Jeevamriitt
and Neem Cake gave centt per centt mycelliiall growtth iinhiibiittiion of tthe Rhiizocttoniia
sollanii att ≥ 15 and 30 per centt concenttrattiion,, respecttiivelly by poiisoned food ttechniique..
In viivo Neem Cake gave maxiimum diisease conttroll wiitth 55..17,, 52..94 and 50..00 per
centt reducttiion iin diisease iinciidence and 40..49,, 38..85 and 35..33 per centt reducttiion iin
diisease severiitty att maxiimum ttiilllleriing,, boottiing and paniiclle formattiion sttages,,
respecttiivelly follllowed by Jeevamriitt.. In viittro,, Baviisttiin 50 WP (att ≥ 25 ppm),, Nattiivo 75
WG (≥ 50 ppm),, Viittavax 75 WP (≥ 100 ppm) and Raxiill 250 EC att 250 ppm
concenttrattiion gave centt per centt iinhiibiittiion of R.. sollanii.. Baviisttiin 50 WP (0..1 %) was
found tto be mostt effecttiive botth as seedlliing roott diip ttreattmentt wiitth 64..52 and 51..27
per centt reducttiion iin diisease iinciidence and severiitty and folliiar sprays wiitth 70..59 and
85..93 per centt reducttiion iin iinciidence and severiitty of ShB,, respecttiivelly att maxiimum
ttiilllleriing sttage and siimiillar pattttern of effecttiiviitty was observed att boottiing and paniiclle
formattiion sttages.. Among 50 genottypes of riice screened under arttiifiiciiall iinfecttiion
condiittiions 14 genottypes were found tto be resiisttantt whiille 16 genottypes were
moderattelly resiisttantt.. In compattiibiilliitty sttudiies T.. harziianum (TH-4) showed compllette
compattiibiilliitty wiitth Raxiill 250 EC att 1 ppm and moderatte compattiibiilliitty up tto 7 ppm
whiille allll tthe biioagentts viiz..,, T.. koniingiiii (DMA-8),, T.. harziianum (TH-4),, T.. viiriide,, T..
harziianum (TH-11),, T.. harziinum (Isollatte-7) and T.. harziianum (Isollatte-8) showed
compllette iincompattiibiilliitty wiitth Baviisttiin 50 WP att allll tthe concenttrattiions (1-20 ppm)..
The iinttegratted ttreattmentt T9 (soiill amendmentt wiitth Neem Cake + seedlliing roott diip
ttreattmentt wiitth Baviisttiin 50 WP + folliiar applliicattiion of T.. harziianum (TH-4) + folliiar
applliicattiion of Raxiill 250 EC) was found tto be mostt effecttiive iin reduciing diisease
iinciidence (64..56,, 63..76 and 59..45 %) and severiitty (69..24,, 66..27 and 66..31 %) att tthree
crop sttages (maxiimum ttiilllleriing,, boottiing and paniiclle formattiion),, respecttiivelly..
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