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Studies on Onion Basal Rot Caused by Fusarium oxyporum Schlecht Fr f. sp. Cepae (Hans.) Snyd. And Hans.

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Title Studies on Onion Basal Rot Caused by Fusarium oxyporum Schlecht Fr f. sp. Cepae (Hans.) Snyd. And Hans.
 
Creator Anupama M. Patil
 
Contributor V.I. Benagi
 
Subject Plant pathology
 
Description Onion basal rot is a destructive disease, caused by F. oxysporum f .sp. cepae.
The pathogen was isolated from infected bulb and on the basis of morphological and
cultural studies was identified as F. oxysporum f. sp.cepae. The severity of the disease
was more in Dharwad (42.77) district and least in Bijapur district (15.30%).The
fungus produced microconidia, macroconidia and chlamydospores. Potato dextrose
broth supported maximum dry mycelial weight on 10th day of incubation and potato
dextrose agar supported maximum sporulation and radial growth. The temperature of
30°C, pH 6 was found to be best for fungal growth.
Among the fourteen fungicides screened against pathogen tebuconazole 25 EC
(0.1%) was found highly effective followed by combiproduct containing mancozeb
63%+ carbendazim 12%. Among eight botanicals screened against the pathogen
NSKE was found better in inhibiting the pathogen followed by prickly chaff flower
leaf extract at 5 per cent concentration. Among six bioagents evaluated, T. harzianum,
T. virens and T.koningii were found effective in inhibiting the mycelia growth of the
pathogen. Three nutrients viz., potassium chloride, zinc sulphate and magnesium
sulphate were also screened against the pathogen, potassium chloride inhibited
satisfactorily (21.82%) . The bioefficacy of fungicides, botanicals and bioagent which
performed well in vitro condition were tested in vivo condition as well. Among them,
seed treatment with T. harzianum+ drenching with mancozeb 63%+ carbendazim
12% at 0.3 per cent concentration were effective in reducing the per cent disease
incidence of basal rot disease.
 
Date 2016-11-21T16:57:35Z
2016-11-21T16:57:35Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/86765
 
Format application/pdf
 
Publisher UAS, Dharwad