Basharat Mehmood, Muhammad Tariq-Khan, Hafiz Matee-ur-Rehman, Muhammad T. Younas


The present study was conducted to record incidence and severity of citrus canker and to screen citrus species against this disease. A detailed survey was conducted in 19 nurseries and 13 commercial orchards of Peshawar division during 2011. It was observed that almost all the nurseries were severely affected by the disease. The highest disease incidence (100%) and severity (31.54%) were observed in New Tarnab nursery in (Mention name of district here). Among the orchards, Shado II showed comparatively more disease severity (2.92%) as compared to other orchards. Bacteria, isolated from symptomatic plant samples on nutrient agar medium produced small, shiny yellow colonies with smooth margins. Biochemical tests further confirmed the bacteria as Xanthomonas axonopodis pv. citri. Detached and attached leaf assays were made to check the resistance of four citrus species i.e. Citrus sinensis (sweet orange), C. aurantifola (kaghazi lemon), C. paradise (Grape fruit) and C. medica (Lime). C. medica was moderately resistant whereas C. sinensis was found to be the most susceptible against the disease. Present study will be useful for developing best possible solution for the management of citrus canker in Peshawar division.


Xanthomonas axonopodis pv. citri; sweet orange; lemon; host resistance

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Pakistan Journal of Phytopathology
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