STUDIES ON TIP OVER OR RHIZOME ROT DISEASE OF BANANA
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Date
2013-07
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K.R.C. COLLEGE OF HORTICULTURE COLLEGE OF ARABHAVI (UNIVERSITY OF HORTICULTURAL SCIENCES, BAGALKOT)
Abstract
Roving survey was conducted in major banana growing areas of Belgaum, Bagalkot and Bijapur districts of Northern Karnataka during 2012. The highest incidence of the disease was recorded in Salahalli (30.000 0) followed by Dastikoppa (24.39° o), Siddapur (26.66° 0) on Grand Naine
cultivar and Lokapur (24.280 0) on Rajapuri cultivar.
The pathogen was isolated from infected rhizome pieces on nutrient agar medium which produced greyish white coloured, round and mucoid colonies. The pathogen was identified on the
basis of cultural, morphological and biochemical characteristics. Among the various solid media tested, the maximum number of colonies were produced on Nutrient Agar followed by Yeast Extract
Sucrose Peptone Agar.
Among the chemicals evaluated in in-vitro against Erwinia chrysanthemi, the maximum
inhibition zone (23.16 mm) was recorded in copper oxychloride at 4000 ppm followed by copper
oxychloride at 3000 ppm (21.33 mm) and copper sulphate at 2000 ppm (16.50 mm). Among the
antibiotics tested, streptocycline was found to be very effective in inhibiting the growth of the
pathogen at 1000 ppm (21.50 mm) and 750 ppm (20.16 mm).
Combination of streptocycline 500 ppm with copper oxychloride 3000 ppm (24.75 mm) effectively inhibited the growth of the pathogen followed by streptocycline 500 ppm + copper oxychloride 1000 ppm (19.75 mm) and streptocyclineéOO ppm + copper oxychloride 2000 ppm (19.37 mm). ' ' \ ;
At 10 per cent concentration, clove extract of Allium sarivum and leaf extract of Adhatoda vasica were found to be effective in inhibiting the growth of the pathogen (7.33 mm). At l5 per cent concentration. corm extract of Fem/a asafoerida was found to be moderately effective in inhibiting the growth of the pathogen (7.33 mm). At 20 per cent concentration, clove extract of Allium sativum was found to effective in inhibiting the growth of the pathogen (9.00 mm). The clove extract of Allium sanctum at lzl concentration was found to be moderately effective in inhibiting the growth of the pathogen (8.00 mm). The antagonists Pseudomonux fluorescens was found to be effective in inhibiting the growth of the pathogen (9.2 mm) followed by Pseudomonas viriclcjluvu. Among the
twenty banana cultivars tested under artificially inoculated conditions, cultivar Ney Poovan
(Yalakkibale) was resistant to tip over or rhizome rot disease of banana.
Description
TH463
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