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Studies on Sett Rot of Sugarcane and Its Management with Special Reference to Acetobacter diazotrophicus Gillis and de Ley

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Title Studies on Sett Rot of Sugarcane and Its Management with Special Reference to Acetobacter diazotrophicus Gillis and de Ley
 
Creator H.K.Vijaya
 
Contributor Srikanth Kulkarni
 
Subject Plant Pathology
 
Description Sugarcane (Saccharum officinarum L.) is an important commercial crop of tropical
and subtropical countries. The crop is susceptible to several diseases. Sett rot or pineapple
disease caused by Ceratocystis paradoxa (de Seynes) Moreau is both sett and soil borne
diseases of sugarcane affecting the sett germination at the early stages of planting. The
pathogen was isolated by following standard tissue isolation technique from infected setts and
identified as C. paradoxa by studying its morphological characters such as mycelium,
conidiophores, microconidia and macroconidia both from host and culture. Among the solid
and liquid media tested, maximum growth of the fungus was supported by potato dextrose
agar and potato dextrose broth (PDB) respectively. Maximum growth of the fungus was
reached on 12th day of incubation. The physiological studies revealed that maximum growth
of the fungus was at temperature of 30°C, pH 6 and exposure to continuous light. Starch was
best carbon source for the fungal growth.
The garlic extract at 10 per cent were found to be effective in inhibiting mycelial
growth of C. paradoxa. Trichoderma viride, Pseudomonas fluorescens were found to be
effective antagonistic agents against the fungus. Acetobacter diazotrophicus effectively
reduced mycelial growth of C. paradoxa and pH of the medium in PDB. Among the systemic
fungicides carbendazim and propiconazole and among the non-systemic fungicides thiram
and captan were found effective in inhibiting the fungal growth. The management studies in
both pot culture and field studies revealed that, combined application of T. viride, P.
fluorescens, A. diazotrophicus and Azotobacter chrococcum recorded highest germination per
cent of the setts. Combined application of these bioagents also recorded lowest per cent
disease incidence, highest cane and sugar yield, qualitative and quantitative yield parameters
of the crop along with highest available soil nitrogen and phosphorus content in the field
studies.
 
Date 2016-10-24T18:45:17Z
2016-10-24T18:45:17Z
2005
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81648
 
Format application/pdf
 
Publisher UAS, Dharwad