Vol. 11, Issue 1 (2022)

Author(s):
Jitendra Kumar, Renu Kumari Gupta and Anila Doshi

Abstract:
Bacterial leaf spot pathogen Xanthomonas axonopodis pv. vignaeradiatae produces symptoms on leaves, stems, pods and seeds. Small water-soaked spots are the initial symptoms observed on leaves and appear within 4 to 10 days of infection. Bacterium was tested on 20 different plant species by inoculating one months old leaves by carborundum abrasion technique and the disease development was recorded. The pathogen could produce visible symptoms on Black gram (Vigna mungo), cow pea (Vigna sinensis) and cluster bean (Cyamopsis tetragonoloba) out of the twenty plant species. This study indicates that sensitive plant species may be collateral hosts of this pathogen and it has narrow host range. In host age studies, the PDI decrease with increase in age of green gram plants after attaining the maximum severity at 30 days stage. In plant debris, the survival period of pathogen was maximum (480 days) in refrigerator and minimum (40 days) in outdoor conditions. The bacterium survived longer in seeds (570 days) in case of bacteria soaked seeds stored in refrigerator.