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Studies on diagnosis and management of fungal wilt diseases of carnation and gerbera under protected cultivation

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Title Studies on diagnosis and management of fungal wilt diseases of carnation and gerbera under protected cultivation
 
Creator C.Kishore
 
Contributor Srikanth Kulkarni
 
Subject Plant Pathology
 
Description The incidence of wilt disease on gerbera ranged from three to 10 per cent. Besides
wilt, in some greenhouses, powdery mildew and leaf blight were also noticed on gerbera. On
carnation, the wilt disease incidence varied from five per cent to 35 per cent. The cultures
isolated from wilted gerbera and carnation plants were identified as Fusarium oxysporum
Schelchtend.:Fr. f. sp. gerberae Gordon and Fusarium oxysporum Schelchtend. Fr. f. sp.
dianthi (Prill. & Delacr.) Snyder & Hans. respectively based on morphological and cultural
characters. Pathogenicity was proved for both the pathogens by artificial inoculation of
gerbera suckers with F. oxysporum f. sp. gerberae and carnation rooted cuttings with F.
oxysporum f. sp. dianthi.
Both the pathogens produced three types of asexual spores, viz. microconidia,
macroconidia and chlamydospores. Oat meal agar, Richards’s agar, Czapek’s Dox agar and
potato dextrose agar supported maximum growth of F. oxysporum f. sp. gerberae. Potato
dextrose agar, Richards’s agar, Czapek’s Dox agar and oat meal agar supported maximum
growth of F. oxysporum f. sp. dianthi. Maximum dry mycelial weight was recorded on oat
meal broth, Richards’s broth and Potato dextrose broth by both the pathogens.
Under in vitro conditions, clove oil and garlic clove extract inhibited mycelial growth
of both pathogens to a remarkable extent. Trichoderma koningii was found most effective in
inhibiting mycelial growth of F. oxysporum f. sp. gerberae. Among the fungicides,
carbendazim, carbendazim + mancozeb (Saaf), carbendazim + iprodione (Quintal) and
mancozeb were found effective against both pathogens. Among the various treatments
studied in vivo, carbendazim @ 0.1% and carbendazim + mancozeb @ 0.2% were very
effective in inhibiting the wilt diseases of carnation and gerbera completely.
 
Date 2016-10-24T19:10:19Z
2016-10-24T19:10:19Z
2007
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81663
 
Format application/pdf
 
Publisher UAS, Dharwad