EFFICACY OF SOME SELECTED TREATMENTS FOR THE MANAGEMENT OF SCAB AND DIE-BACK OF CITRUS

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.