AUTHOR=Riaz Muhammad , Mahmood Rashid , Antar Mohammed , Akhtar Naureen , Khan Salik Nawaz , Anjum Muhammad Ashfaq , Smith Donald L. 

TITLE=A Bacterial Consortium and Synthetic Fertilizer Based Biocontrol Approach Against Potato Rot Disease “Neocosmospora rubicola”

JOURNAL=Frontiers in Agronomy

VOLUME=4

YEAR=2022

URL=https://www.frontiersin.org/journals/agronomy/articles/10.3389/fagro.2022.828070

DOI=10.3389/fagro.2022.828070

ISSN=2673-3218

ABSTRACT=<p>Conventional management of stem rot disease of potato, caused by <italic>Neocosmospora rubicola</italic>, through fungicide application is an environmentally unfavorable practice that calls for an alternative biocontrol approach. Plant growth-promoting bacteria (PGPB) are known to not only promote plant growth but also control diseases caused by various fungi. The study was designed to evaluate the potential of three strains of PGPB and synthetic fertilizer to manage stem rot of potatoes. In the first experiment, PGPB strains <italic>Azotobacter chroococcum, Azospirillum lipoferum</italic>, and <italic>Pseudomonas putida</italic> and their combinations were evaluated on PDA medium against <italic>N. rubicola</italic> using the dual culture technique. All three bacterial strains were found effective in reducing the radial growth of the fungus maximum up to 91%. In the second experiment, in the presence of half and full recommended doses of fertilizer nitrogen (N) and phosphorus (P), the potato growing medium was inoculated with <italic>N. rubicola</italic> alone, and with combinations of <italic>N. rubicola</italic> and PGPB strains (bacterial formulation; BF). <italic>N. rubicola</italic> increased stem and tuber rot, and decreased tuber weight by 11% compared to the control. On the other hand, sole inoculation with BF significantly increased tuber weight. In addition, a combined inoculation of <italic>N. rubicola</italic> and BF, or <italic>N. rubicola</italic> inoculation a week prior to BF inoculation did not affect tuber weight compared to control. However, inoculation of BF a week prior to <italic>N. rubicola</italic>, controlled rot symptoms and increased tuber weight by 32%. An increase in P application favored the PGPB strains in controlling rot in tubers. The interaction effect of fertilizer N with the inoculation combinations was non-significant; however, the main impact of N was to increase rot in tubers and decrease in potato stems. Hence a prerequisite application of PGPB formulation proved to be an effective tool against <italic>N. rubicola</italic> infestation in potatoes.</p>