Bioefficacy of Peat Formulation of Bacterial Antagonists on Growth Promotion and Disease Suppression in Cardamom (<I>Elettaria cardamomum</I> Maton)

G. Sivakumar; A. Joseph Rajkumar; R. Rangeshwaran

doi:10.18311/jbc/2012/3498

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Authors

G. Sivakumar
National Bureau of Agriculturally Important Insects, HA Farm Post, Bellary Road, Hebbal, Bangalore 560 024, Karnataka ,IN
A. Joseph Rajkumar
Cardamom Research Station, Pampadumpara 685 566, Idukki, Kerala ,IN
R. Rangeshwaran
National Bureau of Agriculturally Important Insects, HA Farm Post, Bellary Road, Hebbal, Bangalore 560 024, Karnataka ,IN

DOI:

https://doi.org/10.18311/jbc/2012/3498

Keywords:

Cardamom, Capsule Rot, Bacterial Antagonists, Peat Formulation.

Abstract

Among the 90 rhizobacterial isolates screened against capsule rot pathogen of cardamom Phytophthora meadii Mc Rae two bacterial strains viz., Pseudomonas fluorescens Pf 51 and Bacillus subtilis Bs were found highly inhibitory. Strain Pf 51 exhibited highest inhibition (40.2%) against P. meadii. Similarly B.subtilis strain Bs also exhibited highest inhibition (39.7%) against P. meadii. P. fluorescens strain Pf51 was found compatible with strain B. subtilis Bs. Application of antagonists both Pf 51 and Bs in combination with rhizome bacterization and soil application resulted in 60% reduction of capsule infection over control as compared to single methods such as rhizome bacterization (53%) and soil application (46%). Application of copper oxy chloride resulted in 73% reduction of capsule infection. Maximum height (169.7cm) and number of tillers (36.3) were recorded due to the application of mixture of both the strains through rhizome bacterization and soil application.