EVALUATION OF SELECTED SOYBEAN VARIETIES AGAINST SOYBEAN MOSAIC DISEASE

Abstract

An experiment was conducted in the Central Farm of Sher-e-Bangla Agricultural University, Dhaka-1207, to screen the resistant varieties of Soybean against Soybean Mosaic Virus (SMV) according to incidence and severity during the period from November 2020 to March 2021. Four soybean varieties viz. BARI Soybean-4, BARI Soybean-5, BARI Soybean-6, and Sohag, were used in this experiment by following RCBD design with three replications, data on following parameter viz. diseases incidence (%), severity (%), growth, yield, and yield contributing traits were recorded. There was significant variation found in all traits measured in field. In case of disease incidence and diseases severity, the lowest disease incidence (22.23%) as well as diseases severity (10.65 %) were found in BARI Soybean-4 whereas the highest disease incidence and diseases severity (%) were also found in Sohag that were 27.17% and 12.79 % respectively. In case of growth characteristics like plant height, the number of branches plant

comprising the number of leaves, BARI Soybean-4 showed best performance over others where the highest number of leaves plant ii -1 was recorded from BARI soybean-4 (26.07). In the case of yield and yield attributing traits, the average range of pod number plant -1 varied from 25.40-43.20. Maximum pod number was recorded in BARI Soybean-4 (43.20) and maximum pod length (cm) was recorded in BARI Soybean-6 (3.38 cm). The highest number of seed pod -1 was recorded in BARI Soybean-5 (2.55) followed by the variety BARI Soybean-6 (12.56). The Maximum 100 seed weight was recorded in Sohag (12.24 g). The yield (t/ha) among the varieties ranges from 0.85 (t/ha) to 1.80 (t/ha). The maximum yield (t/ha) was recorded in BARI Soybean-6 (1.61 t/ha) and the minimum yield was also found in Sohag (1.23 t/ha). The highest yield reduction was found in Sohag (28.48%), on the other hand BARI Soybean-5 (12.88%) had the lowest yield reduction. There was a negative incidence and yield and positive relation between incidence and yield reduction. The performance of the variety BARI soybean-4 was much better than the other varieties against Soybean Mosaic Virus (SMV) in field whereas sohag showed worse performance against SMV.