STUDIES ON COLLAR ROT OF CHICKPEA CAUSED BY Sclerotium rolfsii Sacc
KrishiKosh
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Title |
STUDIES ON COLLAR ROT OF CHICKPEA CAUSED BY Sclerotium rolfsii Sacc
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Creator |
JABBAR, SAB
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Contributor |
NAGARAJA, A
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Subject |
food preservation, biological phenomena, diseases, participation, area, sampling, mass media, storage, selection, economics
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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. |
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Date |
2016-11-14T13:11:21Z
2016-11-14T13:11:21Z 2013-07-22 |
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Type |
Thesis
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Identifier |
Th-10499
http://krishikosh.egranth.ac.in/handle/1/85402 |
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Language |
en
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Format |
application/pdf
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Publisher |
University of Agricultural Sciences GKVK, Bangalore
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