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Management of Collar Rot of Groundnut (Arachis hypogaea L.) caused by Aspergillus niger van Teighem

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Title Management of Collar Rot of Groundnut (Arachis hypogaea L.) caused by Aspergillus niger van Teighem
 
Creator Rohtas
 
Contributor Saharan, Hawa Singh
 
Subject diseases, sowing, niger, groundnuts, fungi, planting, application methods, biological development, developmental stages, biological phenomena
 
Description The collar rot disease caused by Aspergillus niger van Teighem is most serious soil and seed
borne fungal disease which causes maximum damage in groundnut (Arachis hypogaea L.). The present
investigation was undertaken to study the effect of A. niger on seed germination and seedling vigour of
groundnut genotypes and to manage the disease through host resistance, fungicides, bio-agents and
botanicals. The pathogen significantly reduced the per cent germination, plumule and radicle length,
fresh and dry weight of seedlings and cumulative reduction in seedling vigour index in all the four
genotypes under both seed and soil inoculation technique. Out of one hundred twenty germplasm lines
screened for their relative resistance against collar rot disease in field under natural sick plot
conditions, none of the lines showed resistant reaction, however, five lines showed moderately
resistant, eighty seven lines showed moderately susceptible reaction, twenty two lines showed
susceptible reaction, while six germlasm lines showed highly susceptible reaction against collar rot
disease. Efficacy of pesticides in vitro against A. niger showed that propiconazole, carbendazim and
carboxin completely inhibited the mycelial growth up to 100 per cent at 200, 500 and 1000 ppm
concentration, respectively. Captan and thiram were found very less effective as they inhibited 81.11
and 72.77 per cent of fungal growth, respectively at higher concentration of 1000 ppm. Fungicide
hexaconazole, herbicide pendimethalin and insecticide chlorpyriphos were failed to show antifungal
activity against A. niger even at 1000 ppm concentration. Evaluation of bio-agents against A. niger in
vitro revealed that Trichoderma viride showed maximum antifungal activity with 78.32 per cent
inhibition of mycelial growth followed by T. harzianum (72.50%) inhibition of mycelial growth and
Pseudomonas fluroscence (23.80%) inhibition of mycelial growth. Seed treatments with fungicides and
soil inoculation with bio-agents significantly reduced the disease incidence of collar rot due to A. niger.
Maximum collar rot disease control was found by propiconazole @ 1ml/kg seed which controlled
87.50 per cent followed by carbendazim @ 2g/kg seed (75.00%) and captan @ 3g/ kg seed (68.76%),
by seed treatment under screen house conditions in pots. In case of bio-agents, T. viride showed
maximum disease control (43.75%) followed by T. harzianum (31.25%) as comparison to control.
Among the botanicals, neem cake powder @ 20g/kg soil showed maximum control of disease
(32.53%) followed by mustard cake powder @ 20g/kg soil (23.97%) in comparison to control.
 
Date 2016-02-10T12:18:58Z
2016-02-10T12:18:58Z
2014
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/64276
 
Language en
 
Format application/pdf
 
Publisher CCSHAU