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.
