Epidemiology and Management of Sett Rot [Ceratocystis paradoxa ( De Seynes) Moreau] of Sugar Cane
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Date
2005
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UAS, Dharwad
Abstract
Sett rot of sugarcane caused by Ceratocystis paradoxa (De Seynes) Moreau is
becoming severe in recent years in major sugarcane growing areas of northern Karnataka.
The disease survey (2003-04 and 2004-05) revealed maximum incidence of 18.78 per cent in
Co-7804 around the Makanur village of Haveri district.
In vitro studies conducted revealed that the pathogen (C. paradoxa) grew well and
sporulated profusely on PDA. It preferred most the starch and potassium nitrate as carbon and
nitrogen source, respectively for its growth and sporulation. It growth was high in
temperature range of 25-30°C and at cent per cent relative humidity. Maximum growth was
noticed when the pH of the media was between 6.0 and 7.5. In studies on inoculation
methods, sett dip method was most effective, when the cut ends were dipped in suspension of
germinated conidia.
The culture filtrate of C. paradoxa found to be deleterious on tomato seeds, where
germination of tomato seed which indirectly hints the production of toxin ethyl acetate (0.1
per cent) by the pathogen did not allow plumle emergence. Out of fifteen cultivars screened
for disease reaction, none of the varieties showed resistance to sett rot. Based on the isozyme
studies, isolates were categorized into three and four groups on peroxidase, polyphenol
oxidase isozyme patterns, respectively.
In the field experiment conducted during 2003-04 and 2004-05 in sick soils, sett
treatment with carbendazim @ 0.1 per cent and T. harzianum @ 10 g/l along with soil
application of FYM @ 25 t/ha and vermicompost @ 2.5 t/ha reduced the sett rot incidence
(13.68%) significantly and improved the quantitative and qualitative yield and yield attributes
with highest cost benefit ratio (1: 2.51).
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Plant Pathology