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Biological control is gaining momentum in the management of sunflower necrosis virus disease (SNVD) as no other effective method is available. In glasshouse experiment-I, six different plant growth promoting microbes (PGPM): Streptomyces sp. PM5, Trichothecium roseum MML005, Bacillus licheniformis MML2501, Streptomyces fradiae MML1042, Pseudomonas aeruginosa MML2212 and Bacillus sp. MML2551 and 2% Morinda pubescens fruit extract applied individually (seed + foliar applications) along with sunflower necrosis virus (SNV) were evaluated in sunflower. Among the treatments, B. licheniformis (Bl), Bacillus sp. (Bsp), P. aeruginosa (Pa), S. fradiae (Sf) effectively increased the plant growth and significantly increased the reduction of virus titre, it ranging from 32.5% to 52.5%. In experiment-II, the above four effective PGPM (Bl, Bsp, Pa and Sf) were developed as consortia in all possible combination in this study and were applied along with SNV against SNVD. All the consortial treatments significantly reduced SNVD in virus titre with disease reduction and concomitant increase in growth promotion when compared to control. In experiment-III, the best PGPM consortia (PGPMC) were applied as seed + soil inoculations along with SNV to study the induction of systemic resistance enzymes. The four culture consortium significantly reduced the SNVD symptoms and virus titer with a concomitant increase in plant growth promotion and ISR enzymes compared to control. In experiment-IV, based on biocontrol efficacy and ISR against SNVD from the experiments I to III, the two more dominant PGPMC treatments were selected and evaluated against SNVD under field conditions. From these results, Bl + Bsp + Pa + Sf effectively reduced the SNVD and improved the plant growth and yield parameters with additional seed yield with income and benefit cost ratio when compared to farmer’s practice. In conclusion, PGPM (Bl, Bsp, Pa and Sf) was found to be very effective against SNVD under glasshouse and field conditions.
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