A study was carried out for the management of stemphylium blight
of onion (Stemphylium vesicarium) through some selected treatments
during the period of December, 2006 to April, 2007 at the farm of Sher-e-
Bangla Agricultural University, Dhaka-1207. The experiment was laid
out in the Randomized Complete Block Design (RCBD) with three
replications. A local onion variety Taherpuri was used in the experiment.
Treatment of onion bulb followed by foliar spraying with eight fungicides
viz., Score, Tilt-250 EC (Propiconazole), Dithane M-45 (Mancozeb),
Champion, Cupravit, Ridomil MZ-72 (Metalaxyl + Mancozeb), Rovral
50 WP (Iprodione), Bavistin (Carbendazim) and one botanical treatment
viz. Neem leaf extract (1:5) with control were applied in the experiment.
Treatment followed by six (6) foliar spraying at 10 days interval starting
from 20 days after planting with Rovral (0.2%) or Dithane M-45 (0.45%)
minimized disease incidence & severity and increased seed yield. The
least leaf infection by Stemphylium vesicarium and the highest bulb yield
was recorded in the sample from Rovral and Dithane M-45 treated plot.