Incidence of bacterial leaf blight of rice in Raigarh district of Chhattisgarh and its management

Abstract

Rice ( Oryza sativa L.) is one of the most important cereal crops in the world. In India, rice is the second major cereal crop with a production of 103.00 million metric tons in an area of 42.75 million hectares. The crop is suffering from a number of biotic and abiotic diseases. Among them, bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae (ex. Ishiyama) Swings et al. is one of the most important biotic diseases causing moderate to severe crop loss in Chhattisgarh. It has a serious constraint on rice production, especially for HYV where the yield losses are high more than 50% during severe infection. A field study was carried out during 2021-2022 at 07 villages of Raigarh district in Chhattisgarh. The lowest incidence was recorded in Jorapali (1.17%), while it was highest in Tarapur (28.71%). The relationship between PDI and temperature was negatively correlated, while a significant positive correlation was recorded between PDI with RH and the total rainfall. Five varieties were evaluated against BLB for their resistant reaction. The variety, MTU 1156, MTU 1010, and Sadhana were recorded as resistant; Sampada was moderately resistant while the variety Swarna was found to be moderately susceptible. Among the treatments used against BLB of rice, a minimum BLB incidence of 15.55% was recorded in streptocycline, followed by Kasugamycin (17.03%) and Bacterinashak (18.05%). The maximum disease incidence of 41.26% was recorded in untreated control followed by cow dung (22.20%). This information can be helpful for further study, and to develop suitable management strategy against the disease.