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Bacterial antagonists isolated from coffee rhizosphere soils were evaluated at different concentrations alone and in combination against Hemileia vastatrix, the causal organism of leaf rust disease of coffee under in vitro and in vivo conditions. Under in vitro conditions, the rhizobacterium, Bacillus subtilis inhibited the growth of urediospores to an extent of 68.20% at a test dosage of 1 x 109 cfu ml-1 followed by Pseudomonas fluorescens to an extent of 64.50% at the same test dose. Combination of P. fluorescens and B. subtilis at 1 x 108 cfu ml-1 inhibited the growth of urediospores of the CLR pathogen to an extent of 61.46%. The natural inhibition of germination in the check treatment was 37.79%. Among fungicides used for comparison, the percent inhibition over control was maximum in Bayleton (89.03%) followed by Bordeaux mixture (80.64%). Under in vivo conditions, during the period of season-I, maximum reduction in disease index was recorded in treatment with Bayleton (71.84%) followed by Bordeaux mixture (53.37%). Among the bioagents, B. subtilis recorded maximum disease reduction (42.98%) at a test dosage of 1 x 109 cfu ml-1 followed by P. fluorescens (33.65 %) at the same test dose. P. fluorescens and B. subtilis in combination at 1 x 108 cfu ml-1 reduced the disease incidence to an extent of 26.45%. The season-II (post-monsoon period) has recorded less disease reduction compared to season-I (pre-monsoon period).
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