Evaluation of Fungicides against White Rust of Mustard under Field Conditions

Abstract

Indian mustard (Brassica juncea L.) is an important oilseed crop, but its productivity is significantly affected by diseases such as white rust caused by Albugo candida. Effective disease management through suitable fungicides is essential to minimize yield losses and improve crop productivity.  The study aims to evaluate the efficacy of different fungicides against white rust of mustard caused by Albugo candida under field conditions. The experiment was conducted in Randomized Complete Block Design during Rabi season, at Agronomy Instructional farm, Sardarkrushinagar Dantiwada Agricultural University, Sardarkrushinagar during 2023-24. The mustard variety Gujarat Dantiwada Mustard 4 was sown at 19th October. Among the fungicides evaluated, metalaxyl 8% + mancozeb 64% WP found significantly superior over rest of the fungicides with the minimum disease intensity of 17.55 per cent which was at par with metalaxyl-M 3.75% + chlorothalonil 50% SC at 0.1 per cent (19.90%). The next better fungicides were tebuconazole 50% + trifloxystrobin 25% WG at 0.1 per cent (25.29%), cymoxanil 8% + mancozeb 64% WP at 0.1 per cent (26.37%) and azoxystrobin 23 SC at 0.1 per cent (28.21%) in reducing white rust intensity. The maximum seed yield of 1680 kg/ha was obtained with the spraying of metalaxyl 8% + mancozeb 64% WP at 0.18 per cent which was at par with metalaxyl-M 3.75% + chlorothalonil 50% SC at 0.1 per cent (1615 kg/ha) and tebuconazole 50% + trifloxystrobin 25% WG at 0.1 per cent (1495 kg/ha).