BIOCONTROL OF ALTERNARIA BLIGHT OF CAULIFLOWER BY PLANT-GROWTH PROMOTING RHIZOBACTERIANIDHI DIDWANIA MANU SOLANKI AND P.C. TRIVEDIAbstract In an experiment conducted in laboratory, 10 strains of plant-growth promoting rhizobacteria (PGPR), Pseudomonas fluorescens and Bacillus spp were evaluated for biological control of leaf spot (black spot) of cauliflower caused by the fungus Alternaria brassicae. In the in vitro pathogen-inhibition zones test the largest inhibition zones were observed with mancozeb and carbendazim. Amongst, the PGPRs the highest inhibition zones were observed with PGPR 10 at 108 cfu mL-1. However, the highest seed germination was occurred with the PGPR-1, PGPR-4, PGPR-10 and PGPR-7. With fungicides treatment also the seed germination increased. The plant vigour index in PGPRs treated seeds was the higher as compared to fungicide and control treatments. We concluded that the growth inhibition is not the only single factor to be relied upon to recommend for an application in field for disease control. Other factors like seed germination and plant vigour index that affect PGPRs should also be considered for a successful deployment disease management.
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