Screening of scented rice genotypes and fungicides against blast and compatibility of pesticides used for the control of neck blast and plant hoppers

摘要

Out of 143 scented rice genotypes, thirty two genotypes namely HKR 06-42, HKR 07-2, HKR 07-9, HKR 07-14, HKR 07-23, HKR 07-24, HKR 07-41, HKR 08-15, HKR 08-17, HKR 08-23, HKR 08-25, HKR 08-26, HKR 08-35, HKR 08-40, HKR 08-51, HKR 09-3, HKR 09-7, HKR 09-8, HKR 09-10, HUBR 10-9, HUR 98, HUR-PB-7M, MAUB 192, MEPH 108, NDR 6110, Pusa 1509-3-3-9-5, RP 3392-132-8-3-3, RP 3392-179-45-18-8, SJR 80, SJR 81, UPR 3506-7-1 -1 and UPR 3506-15-1-1 were found consistently resistant to leaf blast during Kharif 2010and 2011. Among the fungicides evaluated during Kharif2007,to 2009, fenoxanil 5% + isoprothiolane 30% at 2.0 ml/1 was found to be the most promising in reducing the incidence of neck blast and enhancing grain yield of Basmati rice variety CSR 30 followedby its lower dosage, and metominostrobin at 2 ml/1. The combination treatments of both the fungicides (tricyclazole and carbendazim) and insecticides (buprofezin and imidacloprid) were biologically as effective as their individual treatments against neck blast and plant hoppers of rice, respectively during Kharif 20] 1 and 2012 along with corresponding increase in grain yield. Tricyclazole alone and in combination with insecticides proved better than carbendazim alone and its insecticidal combinations.The combination treatments of tricyclazole and carbendazim with imidacloprid were found to be more economical than their combination with buprofezin.