STUDIES ON THE MICROBIAL MANAGEMENT OF ROOT ROT OF OKRA (Abelmoschus esculentus L.)
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Date
2018-03-13
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Effect of biocontrol agents and PGPR on growth, yield and root rot suppression in
okra (Abelmoschus esculentus L.) was studied under both pot and field conditions. Wide
range of biocontrol agents and PGPR were isolated by conducting systemic survey in
okra growing regions of southern parts of Karnataka and based on the in vitro studies,
efficient isolates were selected and used against the root rot causing pathogen Fusarium
solani. The results obtained were clearly revealed that the combination of Trichoderma
viride + Pseudomonas fluorescens + Bacillus megaterium showed significant increase in
the growth, yield and root rot disease suppression in okra under pot and field conditions.
The growth and yield parameters such as plant height (141 cm), number of leaves
(13.33), number of branches/plant (4.33), fruit length (16.4 cm), fruit diameter (1.68 cm),
number of fruits/plant (23.33), fresh fruit yield/plot (34.78 kg), fresh fruit yield (18.40
t/ha) and least root rot disease incidence (4.67 %) was noticed. Microbial analysis of
rhizosphere soil at crop harvest in the above mentioned treatment combination has
showed increased microbial population of beneficial microflora viz., Trichoderma spp.
(38.33 × 104 cfu g-1 soil), Pseudomonas spp. (50.33 × 104 cfu g-1 soil), P solubilizers
(78.33 × 104 cfu g-1 soil) and Azotobacter spp. (34.00 × 104 cfu g-1 soil). The result of this
study has clearly brought out that conjunctive use of Trichoderma viride + Pseudomonas
fluorescens + Bacillus megaterium as soil application is advantageous for the growth,
yield and root rot disease control in okra.
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