Bio-efficacy of Cuprous Oxide 86.2% Wg against Bacterial Blight, False Smut and Blast Diseases of Paddy

Abstract

To know the effect of Cuprous oxide 86.2% WG on bacterial blight, false smut and blast diseases of rice crop the experiment was laid out with 8 treatments and replicated three times in RBD design at ARS, Gangavati during Kharif 2021-22 and Kharif 2022-23 cropping season. The variety BPT-5204 was sown with the spacing of 20 cm x 10 cm in plot size of 5 X 5 m2 with all regular agronomic practices followed as per the standard package of practice of University of Agricultural Sciences, Raichur. During kharif 2021-22 and kharif 2022- 23, among all the treatments, Cuprous oxide 86.2% WG @ 1000 g/ha, reduced the blast disease to the minimum PDI of 14.37 and 13.15 per cent at 10th day observation after 3rd spray when compared with highest PDI of 35.62 and 32.56 per cent at 10th days after 3rd spray in control, respectively. Similar results were obtained during kharif 2021-22 and kharif 2022-23, Cuprous oxide 86.2% WG @ 1000 g/ha, reduced the bacterial blight disease to the minimum PDI of 7.92 and 8.90 per cent at 10th day observation after 3rd spray when compared to highest PDI of 33.56 and 38.30 per cent in control, respectively at 10th days after 3rd spray. Similarly, the incidence of false smut disease was 1.9 and 0.67 per cent when compared to control treatment with the severity of 40.47 and 31.41 per cent at 15 days before harvest with Cuprous oxide 86.2% WG @ 1000 g/ha during kharif 2021-22 kharif 2022-23, respectively. The higher grain yield of 58.00 and 58.80 q/ha was recorded with Cuprous oxide 86.2% WG @ 1000 g/ha during kharif 2021-22 and kharif 2022-23, respectively. Lowest yield of 35.10 q/ha and 35.40 q/ha was recorded in untreated control during both the season.