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Studies on Root Rot/ Wilt of Soybean

KrishiKosh

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Title Studies on Root Rot/ Wilt of Soybean
 
Creator Sangeetha T.V.
 
Contributor Shamarao Jahagirdar
 
Subject Plant pathology
 
Description Soybean Glycine max (L.) Merill is protein rich oilseed crop. It is considered
as a golden bean, miracle bean and wonder crop of the 20th century because of its
characters and usage. Wilt/root rot is caused by Sclerotium rolfsii, Rhizoctonia sp. and
Fusarium sp. are major constraints in soybean production. Isolates of all the
pathogens were obtained during the survey from different locations of northern
Karnataka and the disease incidence varied from 3.36 to 36.30 per cent.
The study on variability of the causal organisms was undertaken. Isolates of
all the pathogens showed marked difference in their growth rate and time taken for
sclerotial initiation and spore production.
Cultural studies on different media revealed that S. rolfsii and Fusarium sp.
grew well on Potato Dextrose Agar and Rhizoctonia sp. grew well on Sabouraud?s
Agar. Isolates varied in their growth in all the temperature tested. Maximum growth
rate and spore germination was observed at 30?C while no growth at 40?C.
In vitro studies revealed that Trichoderma viride, Trichoderma harzianum,
Azadirachtin, Neem oil, Mancozeb, Carbendazim, Thiophanate methyl,
Hexaconazole, Propiconazole, Carbendazim + Mancozeb and Carboxin + Mancozeb
were more effective in inhibiting the mycelial growth of all the three pathogens.
Glasshouse studies revealed that soil drenching with Carbendazim, Carboxin +
Thiram, Thiophanate methyl, Hexaconozole, Neem oil, Nimbicidine, T. harzianum
and T. viride helped to manage the disease successfully.
 
Date 2016-11-10T17:41:42Z
2016-11-10T17:41:42Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/84995
 
Format application/pdf
 
Publisher UAS, Dharwad