Chemical control of leaf scald disease of rice.

摘要

Field experiments were conducted at the experimental farm of the Agricultural Research Station, Lonavla, Maharashtra, India, during 3 consecutive kharif seasons, to determine the efficacy of 9 fungicides (carbendazim 0.1%, Difolatan [captafol] 0.2%,dithianon 0.1%, mancozeb 0.25%, Foltaf [captafol] 0.25%, triforine 0.2%, ediphenphos [edifenphos] 0.1%, captan 0.25% and copper oxychloride 0.25%) against leaf scald of rice (cv. Ratnagiri-24), caused by Monographella albescens. Each fungicide was sprayed twice at an interval of 15 days, starting from the day on which the first visual symptoms of leaf scald were observed. Data on disease incidence and grain yield revealed that all the fungicides tested significantly reduced disease incidence in comparison with the untreated control. Carbendazim and captafol (Difolatan) were the most effective, reducing disease incidence by 81.68 and 76.54%, respectively, and producing the highest yields of 2362.38 and 2243.43 kg/ha, respectively.