Potential of Levofloxacin and Ciprofloxacin against citrus canker caused by Xanthomonas axonopodis pv. citri

Citrus canker caused by Xanthomonas axonopodis pv. citri (Xac) is the most devastating threat to the world citrus industry. A greenhouse and field trail were conducted at Department of Plant Pathology, University of Agriculture Faisalabad. Levofloxacin, Ciprofloxacin were tested against Xac by injection technique under Randomized Complete Block Design (RCBD). Three concentrations (1, 1.5 and 2 %) after 10, 20, and 30 days were tested. Out of these treatments, combination of Levofloxacin and Ciprofloxacin (14.51 %) followed by Levofloxacin 17.48 %, Ciprofloxacin (21.66 %), in greenhouse respectively. In interaction between treatments and concentrations, combination of Levofloxacin and Ciprofloxacin expressed minimum disease incidence (10.44 %) at 2 % and 9.278 % after 30 days of inoculation in the interaction between treatments and days. In field study, combination of Levofloxacin and Ciprofloxacin (17.51 %) followed by Levofloxacin 20.48 %, Ciprofloxacin (24.09 %), and control (64.00 %) respectively. Interaction between treatments and concentrations, combination of Levofloxacin and Ciprofloxacin expressed minimum disease incidence (13.44 %) at 2 % while in interaction between treatments and days, this combination showed (12.27 %) disease incidence followed by Levofloxacin 15.27 % and Ciprofloxacin 17.22 % and control 69.11 % after 30 days of inoculation. In conclusion, combination of Ciprofloxacin and Levofloxacin expressed best results at concentration of 2 % after 30 days of inoculation.