Efficacy of Greenzeb 80% WP Fungicide on Potato Late Blight (Phytophthora infestans) in Bonke, Chencha and Kamba, Southern Nation Nationality People Regional States, Ethiopia

The verification research was carried out at Bonke, Chencha, and Kamba in SNNPRs in 2021 to assess the performance of the fungicide Greenzeb 80% WP in comparison to another promising standard fungicide, Sabozeb 80% WP, for the treatment of potato late blight for registration reasons. The trials consisted of three treatments and were organized in a randomized full block design with three replications. Analysis of variance showed substantial (P < 0.001) differences in late blight severity, area under disease progress curve (AUDPC), and tuber yield between treatments and sites. The results revealed that plots sprayed with Greenzeb 80% WP at the three sites had the lowest mean severity (34.98%) and AUDPC (576.46%-days), as well as the highest marketable tuber output (16,622 kg ha-1). Plots sprayed with Sabozeb 80% WP at all three locations, however, revealed statistical similarities. In summary, evidence from the current verification studies revealed that Greenzeb 80% WP considerably decreased late blight epidemics, resulting in higher potato tuber yields across all sites when compared to unsprayed controls. Greenzeb 80% WP is therefore recommended for registration in order to manage potato late blight, as it has been shown to be quite effective.