Chemical Control of Ufra Disease of Rice

Abstract

Abstract Ufra disease, caused by the rice stem nematode, Ditylenchus angustus, is the most important disease of deep-water rice. Rice plants showing symptoms of ufra disease 15 days after artificial inoculation with the nematode, were treated three times with 0.2% diazinon (60 e.c.), 0.1% benomyl (50 w.p.) and carbofuran granules (3%) at the rate of 22.4 kg product/ha at 15 day intervals. Forty-five days after the first application, 82% of each of benomyl treated and carbofuran treated plants, 17% of the diazinon treated plants and 18% of the untreated control plants recovered and flowered normally. Preliminary attempts to evaluate these findings in deep-water rice under field conditions, showed that 58% of benomyl treated, 61% of carbofuran treated and 10% each of diazinon treated and untreated control plants recovered and flowered normally. The results indicate that there is a possibility of using benomyl, a systemic fungicide and carbofuran, a systemic insecticide, for the control of ufra disease.