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Studies on Potato Wilt Caused By Sclerotium rolfsii Sacc.

KrishiKosh

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Title Studies on Potato Wilt Caused By Sclerotium rolfsii Sacc.
 
Creator R.Baswaraj
 
Contributor Keshav S.Naik
 
Subject Plant Pathology
 
Description Potato (Solanum tuberosum L.) is one of the most important commercial vegetable
crops cultivated in northern Karnataka. Wilt of potato caused by Sclerotium rolfsii Sacc. is
exerting the major threat in potato cultivation in Karnataka.
A roving survey was conducted in potential potato growing areas of Zone 8 (Dharwad
and Belgaum districts). Maximum wilt incidence (30.00%), and maximum tuber rot (43.00%)
were recorded in Ujgon village of Belgaum.
The fungus was isolated from the rhizosphere of wilted plant and identified based on
white dense radiating mycelium in culture and infected plants.
Potato plants were raised in an inoculated pots and pure culture of S. rolfsii was
obtained from wilted plants showing typical wilting symptoms and pathogenicity was proved
successfully at the same time symptomatology was studied.
Among the early and medium maturing cultivars screened against S. rolfsii only
JS/92-164 and K. Jawhar of early maturing group recorded least disease incidence of 20-22
per cent and rest of all the cultivers tested recorded high disease incidence.
Studies on management of wilt of potato revealed that, among organic amendments,
neem cake with oil and neem cake without oil, among the bioagents Trichoderma harzianum
and T. viride and among the fungicides Carboxin (0.05%) and Hexaconazole (0.1%) as tuber
treatment recorded least disease incidence of 20.00 per cent, which were found to be the best
in reducing the disease incidence.
Among the root exudates tested, sorghum and maize root exudates were found
detrimental to Trichoderma harzianum and T. viride, whereas, potato root exudates were
found stimulatory.
 
Date 2016-10-24T18:41:57Z
2016-10-24T18:41:57Z
2005
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81646
 
Format application/pdf
 
Publisher UAS, Dharwad