ARCHIVES
VOL. 8, ISSUE 3 (2026)
Evaluation of antagonistic activity of selected bioagents against Alternaria solani
Authors
Akanksha Babasaheb Shewale, Dr. S L Badgujar, Amit Babrudas Bhagat, Rutuja bajarang thombare, Vishakha Anilrao Thakare, Rajashri Chandrakant Jadhav, Jaydip D Sirsat
Abstract
Potato (Solanum tuberosum L.) is an
important tuber crop cultivated widely for food and nutritional purposes. Among
the major biotic constraints affecting potato production, early blight is an
important foliar disease caused by species of Alternaria, which
adversely affects plant growth and productivity under favourable environmental
conditions. Biological control offers a sustainable option for reducing
dependence on repeated fungicide applications. The present investigation was
conducted during 2025-26 at the Department of Plant Pathology, Vasantrao Naik
Marathwada Krishi Vidyapeeth, Parbhani, to evaluate selected fungal and
bacterial bioagents against early blight of potato caused by A. solani
under in vitro conditions. The pathogen was isolated from naturally
infected potato leaves, purified on Potato
Dextrose Agar and identified on the basis of cultural and morphological
characteristics. Seven bioagent treatments and an untreated control were
evaluated in a Completely Randomized Design with three replications. Fungal
antagonists were tested by dual culture using opposing mycelial discs, whereas
bacterial antagonists were evaluated by a modified dual culture assay using
bacterial streaks and a central pathogen disc. All tested bioagents
significantly restricted pathogen growth compared with the untreated control,
which recorded 90.00 mm colony diameter. Among the tested bioagents, Trichoderma
asperellum (PBN) was found to be the most effective, recording the minimum
colony diameter of 6.43 mm and maximum mycelial growth inhibition of 91.96 per
cent. It was statistically at par with Trichoderma harzianum, (PBN)
which recorded a colony diameter of 7.50 mm and 90.62 per cent inhibition. Aspergillus
awamori and Verticillium lecanii (PBN) recorded 84.77 and 77.28 per
cent inhibition, respectively. Among the bacterial bioagents, Pseudomonas
fluorescens (PBN) exhibited comparatively greater inhibitory activity, recording
63.53 per cent inhibition, followed by Bacillus subtilis (60.60%) and
Pseudomonas striata (56.02%). as promising antagonists for further
evaluation in biological management of potato early blight.
Download
Pages:545-548
How to cite this article:
Akanksha Babasaheb Shewale, Dr. S L Badgujar, Amit Babrudas Bhagat, Rutuja bajarang thombare, Vishakha Anilrao Thakare, Rajashri Chandrakant Jadhav, Jaydip D Sirsat "Evaluation of antagonistic activity of selected bioagents against Alternaria solani". International Journal of Agriculture and Plant Science, Vol 8, Issue 3, 2026, Pages 545-548
Pdf, Certificate, Cover Page, Index Page, Editorial Page, Accept Letter
Please enter the email address corresponding to this article submission.