Twenty strains of Pseudomonas
fluorescens were evaluated for their potential in promoting plant growth and in
the control of late leaf spot caused by Cercosporidium personatum in groundnut
under greenhouse conditions. Seed treatment with P. fluorescens strain Pf1
recorded the highest germination percentage and the maximum plant height. Seed
treatment with P. fluorescens Pf1 significantly controlled late leaf spot
disease of groundnut and increased the pod yield. When the treated seeds were
sown in soil, the antagonist colonized well in the groundnut rhizosphere. P.
fluorescens Pf1 showed the maximum production of indole acetic acid in in
Authors:G. V. Sible, T. Marimuthu, R. Rabindran and R. Velazhahan
Pretreatment of rice leaves with 20 per cent cow dung water extract (CDWE) was found to reduce bacterial blight disease of rice to about 50 per cent. The suppression of the disease by the extract was not due to direct inhibition of the pathogen. Pretreatment of rice leaves with cow dung water extract as foliar spray induced the accumulation of phenolics and enhanced the activities of peroxidase, chitinase and ß-1,3-glucanase. The induced defense mechanisms might have played a role in reducing the disease.