EXPLORATION OF BIOAGENTS AND BOTANICALS FOR MANAGEMENT OF CABBAGE BLACK ROT DISEASE
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Date
2019-09-26
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K.R.C COLLEGE OF HORTICULTURE, ARABHAVI (UNIVERSITY OF HORTICULTURAL SCIENCES, BAGALKOT)
Abstract
Cabbage (Brassica oleracea var. capitata L.) is important vegetable crop grown throughout the world. Cabbage crop is affected by many diseases among black rot disease caused by Xanthomonas campestris pv. campestris (Pammel.) is the most common and destructive disease becoming major threat to the cabbage production in India and affecting both quality and quantity.
The antagonistic activity of PGPR’s viz., Pseudomonas fluorescens and Bacillus subtilis and probiotic bacteria Lactobacillus sp. were evaluated against X. c. pv. campestris under in vitro condition. Lactobacillus recorded the highest inhibition (17.33 mm) followed by P. fluorescens (12.50 mm).
Inhibitory activity of different botanicals tested under in vitro condition. Tulsi leaf extract (10 %) recorded highest inhibition (22.94 mm) followed by eucalyptus leaf extract (21.05 mm).
Among oil cake leachates evaluated, the highest inhibitory effect was observed with pongamia oil cake leachate (18.55 mm) followed by ground nut oil cake leachates (16.44 mm).
Totally 12 endophytes were isolated from healthy cabbage seedlings. Bacterial endophyte, EBL-9 showed maximum inhibition (13.23 mm) followed by EBR-12 (11.10 mm) under in vitro condition.
A pot experiment was carried out for managing black rot disease. Among Lactobacillus spray recorded highest per cent disease reduction (84.62) and enhanced growth and yield parameters followed by sequential spray of Lactobacillus - ground nut leachate - tulsi extract (84.25) and then next best was P. fluorescens (79.16).
The outcome of this study could be more effective in managing black rot disease of cabbage by using Lactobacillus sp. and botanicals viz., tulsi leaf extract, pongamia oil cake leachate. Which also helps in reducing hazardous chemical residual effect and enhancing yield level under field condition.
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