Abstract
Abstract A betelvine leaf spot pathogen was isolated from infected leaves and identified as Xanthomonas campestris pv. betlicola (Patel, Kulkarni & Dhande) Dye. Five antibiotics, two phenols and a naphthoquinone at 50, 100 and 250 ppm were screened for their in vitro toxicity against the pathogen. Streptomycin proved most effective followed by tetracycline and ampicillin giving maximum zonal inhibition diameters (39–40 mm) at 250 ppm. During field evaluation streptomycin was found to be most effective (80–90% disease control) followed by menadione (78–80% and resorcinol (68–72%). No phytotoxic effect was observed. Thus, besides streptomycin, menadione and resorcinol have also emerged as promising agricultural bactericides.
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