Integration of Chemicals and Botanicals for the Management of Pomegranate Bacterial Blight Caused by Xanthomonas axonopodis py.punicae

摘要

Bacterial blight caused by Xanthomonas axonopodis pv. punicae is a serious menace in the cultivation of pomegranate in India. Economical and eco-friendly management of this disease is a major concern. The present investigation was aimed to study in vitro and in planta efficacy of different chemicals and botanicals either individually or in combination. In vitro screening with bacterial antibiotics revealed that, streptocycline @ 250 ppm had the maximum inhibition zone pf 27.19 mm. It was followed bytetracycline @ 250 ppm (22.07 mm) and neomycin @ 250 ppm (20.74 mm). Screening with fungicides indicated that copper oxychloride @ 1000 ppm had the maximum inhibition zone of 21.63 mm followed by copper hydroxide @ 1000 ppm (18.93 mm). Screening with botanicals confirmed that garlic extract @ 20 per cent was most effective (15.74 mm) followed by tulsi extracts @ 20 per cent (13.59 mm) and neem oil @ 0.20 per cent (9.59 mm). In planta bio-efficacy in pot and field indicated that combined application of tetracycline @ 250 ppm + copper hydroxide @ 1000 ppm + garlic extract @ 20 per cent was most effective in the suppression of bacterial blight followed by the foliar application of streptocycline @ 250 ppm + copper oxychloride @ 1000 ppm and tetracycline @250 ppm + copper hydroxide @ 1000 ppm during Kharif 2013 and 2014. It signifies the synergistic action of chemicals and botanicals in combined application against phytopathogens.