VARIETAL PERFORMANCE OF WIDELY CULTIVATED SOYBEAN VARIETIES IN BANGLADESH AGAINST MAJOR DISEASES UNDER FIELD CONDITION

Abstract

The present investigation was initiated to evaluate the varietal performance of soybean varieties against major diseases of soybean in field condition and to determine the disease incidence (%) and percent disease index (PDI) of major diseases of soybean. Four popular varieties namely BARI Soybean-5, Shohag, BINA Soybean-1, BINA Soybean-3 with one Local (OP) varieties were selected. Rust of soybean (Phakopsora pachyrhizi), Powdery mildew (Microsphaera diffusa), Anthracnose (Colletotrichum truncatum) and Soybean mosaic virus were considered as the major diseases. The research work was placed in central research field under Plant Pathology department, Sher-e-Bangla Agricultural University, Dhaka during November, 2018 to April, 2019 and the experiment was carried out with Randomized Complete Block Design (RCBD) plot design with three replications. The four major diseases were prevalent on all the soybean varieties though the disease incidence and PDI level varied with the varieties. Among five soybean varieties one (BINA soybean-1) against rust, one (BARI soybean -5) against powdery mildew were found Highly Susceptible, four (BARI Soybean-5, BINA Soybean-3, Shohag, Local) against rust, four (BINA Soybean3,

Shohag, BINA Soybean-1, Local) against powdery mildew, four (BINA Soybean-3, Shohag, BINA Soybean-1, Local) against anthracnose were found Susceptible, four (BARI soybean -5, Shohag, BINA Soybean-1, Local) against soybean mosaic disease, one (BARI soybean -5) against anthracnose were found Moderately Susceptible, One (BINA Soybean-3) was Moderately Resistant against soybean mosaic disease. There were significant reduction of different growth and yield contributing characters due to disease infection among the soybean varieties. The yield of soybean varieties was found negatively correlated with the disease incidence and PDI of major diseases. Considering the disease incidence (%), PDI, growth and yield contributing characters among the soybean varieties it was evident that no resistant variety was found from this investigation, whereas BINA Soybean-1 and BINA Soybean-3 showed appreciable varietal performance against the major diseases.