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Received: 15th March, 2026; Accepted: 10th May, 2026

Abstract

The field experiments were conducted for four successive seasons of Kharif 2022, Rabi 2022-23, Kharif 2023 and Kharif 2024 to assess the efficacy of commercially available bactericides against bacterial leaf blight disease of rice at MS Swaminathan Rice Research Station, Moncompu, Alappuzha, Kerala. The experiments were carried out in Randomized Block Design (RBD) with three replications in 10 m2 plots using the susceptible variety Uma (MO 16). The bactericides were sprayed as a single application at the time of disease appearance. The evaluated bactericides were Kasugamycin 3 SL @ 2 mlL-1, Copper oxychloride 50 WP @ 3 gL-1, Bleaching powder through irrigation water @ 5 kg ha-1, Bordeaux Mixture @ 10 mlL-1, Copper hydroxide 77 WP @ 2 gL-1, Kasugamycin 3 SL + Copper oxychloride 50 WP @ 2 mlL-1, Streptomycin sulphate 90% + Tetracycline hydrochloride 10 WP @ 0.25 gL-1 + Copper oxychloride 50 WP @ 3 gL-1, Trifloxystrobin 25%+ Tebuconazole 50 WG @ 0.4 gL-1, and Streptomycin sulphate 90% + Tetracycline hydrochloride 10 WP @ 0.25 gL-1 (Standard check). The pooled data of four-season station trials revealed that the combination molecule of Streptomycin sulphate 90% + Tetracycline hydrochloride 10 WP @ 0.25 gL-1 + Copper oxychloride 50 WP @ 3 gL-1, reduced rice bacterial blight disease effectively followed by Copper oxychloride 50 WP @ 3 gL-1 and Kasugamycin 3 SL @ 2 mlL-1. Kasugamycin 3 SL treated plot recorded highest grain yield of 4461 kgha-1and was on par with Streptomycin sulphate 90% + Tetracycline hydrochloride 10 WP + Copper oxychloride 50 WP (4198 kgha-1).