Vol. 12, Issue 10 (2023)

Author(s):
Suman Maurya, Deepak Kumar Saini, Narendra Kumar Bharati and Anita Saini

Abstract:
The wilt of Tomato caused by Fusarium oxysporum f.Sp. lycopersici is one of the devastating diseases of Tomato. The present study about isolates of Fusarium oxysporum f.Sp. lycopersici showed significant variation in Pathogenic variability, Cultural variability and conidial morphology. The pathogenic variability of among isolates of Fusarium oxysporum f.Sp. lycopersici of different locations was tested on susceptible tomato cultivar “Pusa ruby” under inoculated condition. The Pathogen isolates produced variable disease severity ranged from 30.75 to 61.00%. In cultural variability FOL3 isolates observed Fluffy whitish aerial mycelium (88.33 mm) with white pigmentation was collected from Nimbaheda (Chittorgarh). In conidial variability the size of macro-conidia were ranged from 25.50-35.25 µm × 2.8-4.1 µm and the size of micro conidia were 4.95-12.20 µm × 2.30-3.98 µm. The size of chlamydospores was ranged from 5.39 – 7.96 µm in the different isolates. Among the isolates maximum size of macro conidia was measured 35.25 µm (1.4-35) × 4.17 µm (1.0-4.1) in FOL1 isolate and smallest size of macro conidia was measured in isolate FOL3 25.50 µm (1.30-27) × 3.25 µm (0.2-3.5). The variation in size of chlamydospores was observed in isolate FOL4 exhibited maximum length 7.96 µm (6.8-7.1) and smallest size 5.39 µm (4.9-5.3) of was measured in isolate FOL3.