Citrus scab caused by Elsinoe fawcettii is a serious disease of sweet orange in Andhra Pradesh. It causes severe premature fruit drop, poorer quality and smaller fruits and damage to fruits, which results in heavy losses to citrus industry. Considering the seriousness of the disease in Andhra Pradesh, the present study was conducted under field conditions. The trial was conducted during three consecutive years i.e. 2011-12, 2012-13 and 2013-14. Six treatments viz., Calixin at (0.1%), Carbendizim (0.1%), Hexaconizole (0.2%), Copper oxychloride (0.3%) and untreated check as control were imposed starting from marble stage of fruits at monthly intervals. To manage the bacterial canker, Streptocycline (100ppm) was sprayed along with each treatment. Each treatment was replicated four times. The trial was laid out in a randomized block design. Observations were recorded on fully matured fruits. Pooled analysis was done and the results revealed that fruits treated with Hexaconazole (0.2% ) recorded 5.49% incidence followed by Calixin at 0.1% (0.95%) , Carbendizim 0.1% (11.21%), Copperoxychloride 0.3% (18.93%) and Mancozeb at 0.3% (22.8%) and control (T6) 28.04% incidence . Results revealed that, Hexaconazole @ 0.2%, which recorded the lowest (3.14%) disease incidence was found effective and significantly superior over all other treatments with highest benefit cost ratio 1:2.55.
