000			02654nam a2200217 4500
003			OSt
005			20250314113052.0
008			250314b |||||||| |||| 00| 0 eng d
040			_cUAS Dharwad
041			_aEnglish
082			_a632.3 _bSHI
100			_aShivani B. Lakshmi
245			_aVariability in Exserohilum turcicum and Integrated Management of Leaf Blight of Sorghum
250			_aM.Sc. (Agri)
260			_aDharwad _bUniversity of Agricultural Sciences _c2024
300			_a135 _c32 Cms
520			_aABSTRACT Leaf blight caused by Exserohilum turcicum holds global importance due to its detrimental impact on sorghum production. In the present investigation, roving survey carried out during Kharif and Rabi in Dharwad, Gadag, Haveri, Belagavi and Ballari districts indicated maximum mean disease severity in Gadag (28.52% and 25.64%) followed by Belagavi (23.82% and 24.25%) in both seasons. Investigations on variability among 25 different isolates of Exserohilum turcicum revealed notable variations in cultural characteristics across different media. Potato Dextrose Agar proved to be the best supportive media for radial mycelial growth (78.20 mm) followed by Host Extract and Sucrose Agar media (76.59 mm). Variations in morphological characters of different isolates were observed with respect to sporulation (poor to excellent), number of septa (3 to 10), conidial colour (olivaceous brown to olivaceous grey- Kharif and pale brown to olivaceous brown-Rabi), shape (spindle to elongated) and size of conidia (81.41×16.93 μm to 32.98×13.21 μm in Kharif and 79.38×14.17 μm and 34.92×10.48 μm in Rabi) during both seasons. Pathogenic variability studies highlighted CSV51, as resistant to all tested isolates. Among isolates, Gdn was found as most virulent followed by Dhb. For managing leaf blight disease under field conditions, two sprays of hexaconazole 5% EC @1ml/l at 15 days interval found as best with lowest PDI (16.90 %), AUDPC (339.61), improved grain yield (32.84 q ha-1), fodder yield (6.90 t ha-1) and highest benefit: cost ratio of 2.40 followed by hexaconazole 5% EC @1ml/l along with Pseudomonas fluorescens @ 10 ml/l with PDI (21.52 %), AUDPC (444.65), grain yield (30.57 q ha-1), fodder yield (6.42 t ha-1) and B:C ratio of 2.21. Out of hundred lines evaluated for blight resistance, entries viz., CSV 51, SSV 74, CSH 25 including other forty-eight were found resistant (2.0-3.0 grade), whereas Kekri local scored as highly susceptible with grade 9.
650			_aPlant Pathology
700			_aAnjum Syeda Samina
942			_cTH _eM.Sc. (Agri) _h632.3 _kSHI _n0 _6632_300000000000000
999			_c70916 _d70916