Evaluation of Fungicides for the Control of Rust of Euphorbia
1994
Ali Adem (Ministry of State Farms, Coffee and Tea Development, Addis Abeba (Ethiopia))
Euphorbia marginata is one of the flower crops, recently introduced in the State Farms for export purpose. This flower crop is severely attacked by rust (Uromyces sp.) at Zwai State Farm where the flower is being produced. In the effort of controlling the disease fungicides were evaluated for four consecutive years (1988-1992) at Zwai State Farm. Twelve fungicides were screened with manufacturers recommended rates on the variety Variegate, planted on 4x4.5 m plot in RCBD. Four to six sprays were applied each season using motorized knapsack sprayer. The efficacy of these fungicides was evaluated by reducing disease intensity (percent of leaf area affected) and yield (number of exportable stems). The best six fungicides were verified on large observational nonreplicated plots (0.25 ha) at fourteen days spray interval using tractor-mounted sprayer. Among the tested fungicides, Cyprocanazole (Alto 100 SL), Triadimefon (Bayleton 25 percent WP), Triadimenol (Bayfidan 250 EC) and Bitertanol (Baycor 300 EC) have shown the best results in significantly reducing the disease and increasing the number of exportable flower stems per hectare. The economic feasibility of spraying these fungicides has to be determined.
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