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STUDIES ON COLLAR ROT OF CHICKPEA CAUSED BY Sclerotium rolfsii Sacc

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Title STUDIES ON COLLAR ROT OF CHICKPEA CAUSED BY Sclerotium rolfsii Sacc
 
Creator JABBAR, SAB
 
Contributor NAGARAJA, A
 
Subject food preservation, biological phenomena, diseases, participation, area, sampling, mass media, storage, selection, economics
 
Description Chickpea is one of the important pulse crops. Collar rot has
become a threat for its successful cultivation causing 55-95 % mortality
in the seedling stage of the crop. Thirteen isolates of Sclerotium rolfsii
were obtained from different hosts and regions of Karnataka. The
morphological variability studies revealed that the colony diameter
ranged from 1.35 (SrMR) to 2.72 cm (SrHC and SrBSn) at 24 h, 4.42
(SrMR) to 6.77 cm (SrHC and SrBSn) at 48 h and 8.83 (SrDF) to 9 cm at
72 h. The colony colour varied from pure white to dull white and the
topography was fluffy to flat type. Concentric growth circles in the
colonies were present in case of three isolates. Sclerotial initiation varied
between fifth to 13th day, the shape of sclerotia was round except in two
isolates. Sclerotial number among the isolates varied from 81(SrBSn) to
459 (SrBR) whereas the diameter was from 1.05 mm (SrBR) to 2.11 mm
(SrMW).
Among the different liquid media, while carrot broth showed
maximum dry mycelial weight (429 mg), sclerotial production was more
in oat meal extract broth (627). The isolates SrMR, SrHT, SrBSn, SrHO,
SrBG, SrHCr, SrHC, SrMW and SrBR showed high virulence whereas the
isolates SrDS, SrTR and SrDF were less virulent. Among 206 genotypes,
136 were found resistant. T. harzianum-55 from IIHR showed maximum
inhibition (70%) while of the 10 botanicals evaluated; Agave recorded
maximum mycelial inhibition of S. rolfsii. Vitavax power (@ 0.2%) as seed
treatment recorded less infection of collar rot.
 
Date 2016-11-14T13:11:21Z
2016-11-14T13:11:21Z
2013-07-22
 
Type Thesis
 
Identifier Th-10499
http://krishikosh.egranth.ac.in/handle/1/85402
 
Language en
 
Format application/pdf
 
Publisher University of Agricultural Sciences GKVK, Bangalore