_____________________________________________________________________________________________________ *Corresponding author: E-mail: supriyaveeragandham1@gmail.com; International Journal of Plant & Soil Science 34(23): 1532-1537, 2022; Article no.IJPSS.93660 ISSN: 2320-7035 Effect of Selected Bio-agents and Botanical on Alternarial Leafspot of Coriander (Coriandrum sativum L.) Caused by Alternaria alternata (Fries) Keissler Veeragandham Supriya a* , Shashi Tiwari a , Patthi Lakshmi Sindu a and Pottupalli Govardhani a a Department of Plant Pathology, Naini Agricultural Institute, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj-211007 (U.P.), India. Authors’ contributions This work was carried out in collaboration among all authors. All authors read and approved the final manuscript. Article Information DOI: 10.9734/IJPSS/2022/v34i232572 Open Peer Review History: This journal follows the Advanced Open Peer Review policy. Identity of the Reviewers, Editor(s) and additional Reviewers, peer review comments, different versions of the manuscript, comments of the editors, etc are available here: https://www.sdiarticle5.com/review-history/93660 Received 25 September 2022 Accepted 27 November 2022 Published 02 December 2022 ABSTRACT Coriander (Coriandrum sativum L.) is one of the important spice crops of Apiaceae family. Coriander seeds are used as medicine to cure indigestion, dysentery, vomiting as well as cold and like all other green leafy vegetables, its leaves are a rich source of vitamins, minerals and iron. The country's annual production of coriander seeds in the year 2021 was over 822 thousand metric tons cultivated over 2.92 lakh hectares. Alternarial leaf spot of Coriander which is caused by Alternaria alternata is one major disease in the coriander. The Trichoderma viride, Pseudomonas fluorescens, Bacillus subtillis and Garlic extract were tested under field conditions during rabi season 2021 for their efficacy against the disease and growth & yield parameters. Among the treatments the maximum plant height (cm) at 90 DAS was recorded in T 2 – Trichoderma viride+ Pseudomonas fluorescens followed by T 3 – Pseudomonas fluorescens as compared to untreated check control T 0 . The maximum number of branches at 45 DAS was recorded in T 2 – Trichoderma viride+ Pseudomonas fluorescens followed by T 3 – Pseudomonas fluorescens as compared to untreated check control T 0 . The maximum root length at 90 DAS was recorded in T 5 – Trichoderma viride+ Bacillus subtillis followed by T 2 – Trichoderma viride + Pseudomonas fluorescens as compared to Original Research Article