Field trials conducted at CCSHAD Rice Research Station, Kaul during Khari 2003 to 2009 revealed that out of 4052 rice genotypes and 22 near isogenic lines (NILs) evaluated under artificial epiphytotics, 45 genotypes viz. BC1F1-1094-128-549-0-1-0, BC4F1, 111-120-2735-12, CR 837, CRK22, CRMAS 2231–36, CRMAS 2231–37, CRMAS 2231–48, CRMAS 2232–23, CRMAS 2621-7-1, CRMAS 2621-7-2, CRMAS 2622-2-2, CRMAS 2622-3-4, CRMAS 2622-7-6, CRMAS 2622-43-5, HKR 95–75, HKR 95–128, HKR 95–131, HKR 95–138, HKR 99–57, HKR 99–58, HKR 99–60 (HKR 48), HKR 2000–57, HKR 2001-115, HKR 2001-116, PAD 1973-121-1-2-1-1, PAD 2020-10-3-1, PAD 2520-3-2-3-2-1-2-2-2, PAD 2769-20-2-3-3-2-1-2, PAD 2991-48-2, PAD 2991-102-1, PAD 3040-3-4-4, PAD 3042-33-4, PAD 3075-20-3, PAD 3110-37-1-1-1, PAD 3111-45-1, PAD 3116-7-8-1, PAD 3127-143-2-1, PR 106-P2 PR 106-P9 PR 116, PR 118, RP Bio 170, RP Bio 226, SS 1113, Tainjung 72 and three NILs namely, IRBB 58 (Xa4 + xa13 + Xa21), IRBB 59 (xa5 + xa13 + Xa21) and IRBB 60 (Xa4 + xa5 + xa13 + Xa21) were found consistently resistant to bacterial blight caused by Xanthomonas oryzae pv. oryzae (Xoo). Among various botanicals and non-conventional chemicals evaluated, foliar application of dimethyl sulphoxide, crude extract of Pilkhan (Ficus infectoria) fruits, Aonla (Emblica officinalis) leaves and soil application of probenazole reduced the disease severity by 30–35 per cent. However, maximum disease control (54.4%) along with a significant increase in grain yield were provided by a combination treatment of single spray of 2,4-D ethyl ester (1.0 mg/l) and two sprays of Streptocycline (200 mg/l) + copper oxychloride (2.5 g/l) followed by a combination of nickel nitrate and maleic acid.
