Estimation of Avoidable Loss in Elite Genotypes of Soybean due to Soybean Rust caused by Phakopsora pachyrhizi Syd

Abstract

Seven different types of elite varieties were studied for loss estimation during Kharif 2010 and eight varieties during 2011. The pooled analysis over two years indicated maximum per cent loss (61.43) in VLS 63 genotype followed by TK 5 (59.83) and PK 1029 (58.07) during Kharif 2010. During Kharif 2011, maximum yield loss of 56.89 was recorded in TK 13 followed by JS 335 (49.63) and PK 1029 (48.50). The genotypes which are slow rusters such as Dsb 21 and DS 2309 recorded yield loss of 11.81 and 39.95. The most susceptible genotypes recorded yield loss of 55.63 and 53.29 percent respectively. The crop loss estimation due to rust revealed that lower disease index with increased seed yield was recorded in protected plots receiving two sprays of hexaconazole in both susceptible and resistant varieties than unprotected treatment.