Vol. 11, Issue 2 (2022)

Author(s):
Suresh Meena, RP Ghasolia and Jitendra Sharma

Abstract:
Alternaria blight of fennel, caused by Alternaria alternata, is one of the major diseases of fennel. Studies were conducted to compare the morphological and pathogenic variability among 15 isolates of Alternaria alternata isolated from fennel, were collected from different locations of Sirohi, Pali, Jodhpur, Dausa and Tonk districts of Rajasthan. All the isolates showed variation in their morphological characters i.e. colony color and shape; conidial number, size, width, length, shape and septation on PDA. Among these, isolates i.e. JF₁ and TF₁ showed excellent sporulation with maximum colony diameter 90.0 mm and 90.0 mm, respectively. These isolates show variation in their spore length and width also. All the isolates were virulent on the tested variety of fennel for virulence. Among these isolates, JF₁ was the most virulent causing maximum disease intensity (80.37%) followed by TF₁ (78.18%), JF₃ (76.24%), SF₃ (72.65%) and DF₃ (72.60%) while minimum disease intensity was recorded with DF₂ (45.25%).