Vol. 11, Issue 8 (2022)

Author(s):
Shashank Shekhar, Mehi Lal, Akshat Sharma, Arvind Yadav, Satyendra Kumar Vishwakarma and Popin Kumar

Abstract:
Twenty Alternaria species were collected from different locations from rabi season of 2021 and 2022. Out of these 20 isolates, 15 were of Alternaria alternata designated as, AA 1, AA 2, AA 3, AA 4, AA 5, AA 6, AA 7, AA 8, AA 9, AA 10, AA 11, AA 12, AA 13, AA 14, AA 15 and 5 were of Alternaria solani designated as, AS 1, AS 2, AS 3, AS 4, AS 5. Cultural characteristics based on colony colour and mycelial width were observed at different time intervals. The colony colour of Alternaria alternata was dark green in colour whereas, Alternaria solani is black and colony diameter of every isolate varies from each at different time interval. Morphological characteristics of Alternaria alternata conidia were septated by 1-2 vertical and 5–6 horizontal septa, while Alternaria solani conidia were septated by 3–4 vertical and 2–10 horizontal septa. Conidia in Alternaria solani range in length from 90 to 160 m, while conidia in Alternaria alternata range in length from 60 to 90 m. Alternaria solanihas a beak length range of 18 to 22 mm, whereas Alternaria alternate has a beak length range of 8 to 11 mm. Alternaria solani and Alternaria alternata both have mycelial widths that span roughly from 9 to 12 metres.