In vitro evaluation of antibiotics and antibacterial chemicals against Ralstonia solanacearum infecting bacterial wilt in chilli

Abstract

An experiment was conducted to find out the effective antibacterial chemicals against the growth of Ralstonia solanacearum causing bacterial wilt of chilli under in vitro conditions. Among the five antibiotics (at concentrations each @ 400 and 500 ppm) and two antibacterial fungicides (at concentrations each @ 1500 and 2000 ppm) tested significantly inhibited growth of R. solanacearum, over untreated control. Among the five antibiotic tested average inhibition zone was ranged from 11.20 mm to 21.10 mm. However, it was significantly highest with streptocycline (21.10 mm), followed by gentamycin (18.11 mm), tetracycline (16.75 mm) and cephalexin (14.96 mm); whereas, it was significantly least with neomycine (11.20 mm). Among the two antibacterial fungicides tested average inhibition zone was ranged from 11.84 mm to 12.84 mm. However, it was significantly highest (12.84 mm) with the treatment T6 (copper oxychloride), followed by T7 (Copper hydroxide) with 11.84 mm.