Abstract:
A research work was conducted on the standing citrus plant raised at
citrus orchard in Sher-e-Bangla Agricultural University, Dhaka, during
the period from March to September 2007 to investigate the effect of
some selected treatments in controlling the scab and die back of citrus.
Allarnanda leaf (Allamanda catherticay leaf extract and seven fungicides
viz. Dinthane M-45 (0.3%). Rovral 50WP (0.1 %), Bavistin 50 WP
(O. l %), Champion 77 WP (0.2%). Cupravit 50WP (0.2%), Tilt 250EC
(0.25o/o) and Proud 250EC (0.25%) were tried against Elsinoe fa ... vcettii in
controlling scab and dieback of citrus. A marked reduction of disease
incidence and severity of scab and die back of citrus was observed after
commencement of spraying and reduction of disease, reached to the
highest after three month of spraying. The highest reduction of POI (leaf)
and POI (fruit) of scab of citrus was recorded in champion 77Vt'P
(85.43o/o and 80.12% respectively) at three months after sixth sprays and
the highest reduction of PDI (twig) of die back of citrus was recorded in
case of Dithane M-45 (58.0 I%). Allamanda leaf extract also showed
better performance in reducing the severity of scab and die back of citrus.
