Cultural, Morphological and Pathogenic Variability in Alternaria burnsii causing Blight of Cumin

摘要

The present investigation was undertaken to study the cultural, morphological and pathogenic variability in five isolates of causal agent of cumin blight during 2011-2012. The isolates were procured from four major cumin growing districts, Jalore, Udaipur, Bikaner and Jodhpur of Rajasthan. These exhibited considerable variations in cultural and morphological characteristics. Pathogenic variability with inoculation on pot-grown plants of cumin and black cumin resulted in 24.2 to 65.4 and 26.2 to 68.6 PDI, respectively. The isolates also exhibited significant variations in symptoms and latent period. Based on the disease severity, the five isolates were distinguished into pathogenic groups, where isolate from Jalore district was found most virulent and predominantby causing the typical blight symptoms with shortest latent period and highest disease severity.