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Studies on fungal diseases of patchouli with special reference to wilt caused by Fusarium solani (Mart.) Sacc.

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Title Studies on fungal diseases of patchouli with special reference to wilt caused by Fusarium solani (Mart.) Sacc.
 
Creator Sreedevi S.Chavan
 
Contributor Yashoda R.Hegde
 
Subject Plant Pathology
 
Description The major constraint for cultivation of patchouli is Fusarium wilt caused by Fusarium
solani (Mart.) Sacc. Fusarium wilt was noticed in all the locations surveyed with the range of
20.00 to 61.25 %. The maximum disease incidence was noticed in Dharwad district (48.26%)
and least in Uttar Kannada district (25.62%). Other diseases observed were leaf blight caused
by Alternaria alternata (Fr.) Keisser., Sclerotium wilt caused by Sclerotium rolfsii Sacc. Leaf
blight incidence was more in Belgaum district (22.52%). Sporadic incidence of Sclerotium
wilt was observed in Saidapur and this is the first report of Sclerotium wilt of Patchouli.
F.solani produced microconidia, macroconidia and chlamydospores. Potato dextrose
agar and Richards’ agar supported maximum radial growth and dry mycelial weight on 10th
day of incubation. The temperature of 30°C, pH 6.5 and 12 h light and 12 h darkness were
found to be best for fungal growth. Sucrose and potassium nitrate were found to be best
carbon and nitrogen sources for the growth of fungus, respectively. Among twelve hosts
tested for host range of F. solani, nine hosts were susceptible which can be considered as
collateral hosts.
The results of morphological and cultural studies indicated that there was slight
variation among the isolates of Fusarium solani. RAPD data distinguished eight isolates into
two clusters A and B, which is in accordance with their geographical locations. Under in vitro
conditions, neem seed kernel extract at 10% and Trichoderma harzianum were able to reduce
the growth of pathogen to a remarkable extent. Among fungicides, carbendazim and
carbendazim + mancozeb at 0.025, 0.05 and 0.1 and mancozeb at 0.2 and 0.3% were found
effective against the pathogen. Under in vivo studies, carbendazim, carbendazim + mancozeb,
carboxin + thiram, propiconazole @ 0.1 and mancozeb @ 0.2% were very effective in
inhibiting the disease completely.
 
Date 2016-10-24T19:11:34Z
2016-10-24T19:11:34Z
2007
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81664
 
Format application/pdf
 
Publisher UAS, Dharwad