Abstract:
Survey was conducted on rice blast in 110 rice field of 12 upazillas under 5
districts of Bangladesh namely Mymensingh, Kishoreganj, Barishal, Naogaon
and Cumilla. Among the survey Muktagachha, Mymensingh was found the
highest blast disease infected area and Bakerganj, Barishal was found the
lowest blast disease infected area in Boro season 2017-2018. Pyricularia
oryzae was isolated from infected leaf and panicle and identified based on
cultural characteristics and conidia morphology. Eight fungicides namely
Trooper 75WP, Seltima 100CS, Nativo 75 WP, Amister Top 250 SC, Azonil
56 SC, Autostin 50 WDG, Filia 525 SE, Dithane M-45 were tested for
controlling mycelial growth of Pyricularia oryzae in vitro in the Plant
Pathology laboratory, Department of Plant Pathology, Sher-e-Bangla
Agricultural University, Dhaka-1207. Experiment was conducted in
Completely Randomized Design (CRD) with four replications. Data on radial
mycelial growth was taken at 7, 14 and 21 days after inoculation (DAI). The
highest inhibition of mycelial growth was observed when Potato Sucrose Agar
(PSA) was amended with Trooper 75 WP (Tricyclazole) followed by Filia and
Nativo and lowest inhibition was recorded in Dithane M-45(Mancozeb)
amended with PSA media. From these results Trooper (Tricyclazole) was
found to be the best effective fungicide and is needed to further field evaluation
for confirmation of the result.
