Citrus Canker

Host name: Citrus species
Pathogen name: Xanthomonas citri(bacteria)
Classification:
Kingdom-Monera
Phylum-Proteobacteria
Class-Gammaproteobacteria
Order-Xanthomonadales
Family-Xanthomonadaceae
Genus-Xanthomonas
Species-citri
Sub species-citri
Tikka disease of groundnut pictures:

Characteristics:
-The disease is caused by bacterium Xanthomonas citri and affects citrus species.
-The market value of the fruit is considerably reduced by canker spots formed due to the infection.
-The symptoms of the disease include minute water soaked round lesions which later become large and brown.
-These lesions coalesce to form patches.
-In cases of severe infection,the infected twigs start drying from the tip leading to defoliation.
-Fruit yield is significantly reduced.
Reference:Common Core Botany by sri vikas publications.