Field evaluation of different chemicals against Bacterial leaf blight disease of rice caused by Xanthomonas oryzae pv. oryzae.

Abstract

Rice (Oryza sativa L.) belongs to family Poaceae (Gramineae) and widely cultivated in the India. Bacterial leaf blight (BLB) of rice caused by Xanthomonas oryzae pv. oryzae is emerging as serious threat to rice production worldwide, including India & its state of Bihar. Keeping in view enormous losses caused by this disease an attempt has been made to control this disease through chemicals. Five fungicides and two antibiotics were tested in field condition, Combination of Copper oxychloride @ 0.3% + Streptocycline @ 0.005% was found maximum mean incubation period i.e. 15.20 days. Significantly minimum per cent disease index were recorded in Copper oxychloride @ 0.3% + Streptocycline @ 0.005% i.e. 34.72% mean disease index as compared to control 63.89%. Maximum biological yield (122.78 q/ha), straw yield (73.67 q/ha), yield (49.11 q/ha) and chlorophyll content SPAD value (34.14) were observed in treatment Copper oxychloride @ 0.3% + Streptocycline @ 0.005% which was followed by Copper hydroxide @ 0.3% + Streptocycline @ 0.005% biological yield (118.33 q/ha), straw yield (71.00 q/ha), yield (47.33 q/ha) respectively against Bacterial leaf blight disease of rice causing Xanthomonas oryzae pv. oryzae.