Effect of Triazole and Strobilurin Fungicide Against Alternaria Leaf and Pod Blight (Alternaria raphani) in Radish (Raphanus sativus var. Mino Early)

Abstract

A field experiment was conducted to evaluate the effect of Triazole and Strobilurin fungicides on Alternaria leaf and pod blight (Alternaria raphani) of radish (Raphanus sativus var. Mino Early). The experiment lasted from November 2021 to March 2022 following a completely randomized block design (RCBD) with three replications. Seven treatments were evaluated, including T1 (Propiconazole 25% EC), T2 (Tebuconazole 25% WDG), T3 (Azoxystrobin 23% SC), T4 (Propiconazole 13.9% + Difenoconazole 13.9% EC), T5 (Azoxystrobin 11% + Tebuconazole 18.3% SC), T6 (Tebuconazole 50% + Trifloxystrobin 25% WP), and T7 (control). Analysis of the data showed that T4 had the lowest disease severity in radish leaves with a mean value of 22.67±1.76. T1 followed closely with a mean disease severity of 27.11±1.16, while T3 had a mean severity of 29.67±1.73. Regarding pod infection, T4 also showed the most effective control with a mean infection level of 17.56±1.76. This was followed by T1 with a mean infection level of 19.78±1.16 and T3 with a mean infection level of 21.33±1.73. Overall, the results indicate that the application of T4 (Propiconazole 13.9% + Difenoconazole 13.9% EC) significantly reduced disease severity in both radish leaves and pods, demonstrating its efficacy in managing Alternaria leaf and pod blight. These results suggest that T4 may be a suitable fungicide treatment option for the control of Alternaria blight in radish crops. Further research and field trials are required to validate these results and to investigate the long-term effects of treatments on radish growth, yield, and quality.