In vitro evaluation of antibiotics against Enterobacter cloacae causing leaf rot of onion

Abstract

A present investigation for the management of leaf rot of onion (Allium cepa) was carried out at Department of Plant Pathology, University of Horticultural Sciences Bagalkot. The antibiotics / chemicals were screened against the growth of Enterobacter cloacae, by agar well diffusion method. Among the different antibiotics, streptocycline (31.33, 33.50 and 35.33 mm) and plantamycin (26.00, 26.83 and 28.33 mm) were shown highest inhibition at 300, 400 and 500 ppm concentrations, respectively. It was followed by 2-bromo-2 nitropropane-1, 3-diol (23.17, 25.83 and 31.67 mm) at different concentrations, respectively. Among the fungicides copper hydroxide (16.17, 18.83 and 22.17 mm) and copper oxy chloride (15.83, 17.50 and 20.83 mm) recorded highest inhibition at 1500, 2000 and 2500ppm, respectively. Whereas kasugamycin (Omycin) was not shown any inhibition zone at all the concentrations tested. Wheras in water control no inhibition was observed.