An important vegetable in Ethiopia is cabbage (Brassica oleracea L. var. capitata), but the cabbage aphid severely limits its production, resulting in yield losses of up to 80%. Reliance on synthetic insecticides has created environmental and health risks, suggesting that there must be underscoring sustainable pest control alternatives. This study assessed the efficacy of botanicals (Endod, Tobacco, Tinju, and Kitkita) against cabbage aphids in the Koga Irrigation Scheme during the 2023 irrigation season. The experiment used a randomized full block design with three replications and fourteen treatments, including three concentration levels for each botanical, a chemical check (Dimethoate 40% EC), and a control. SAS 9.4 software examined data on aphid infestation, efficacy, plant growth, yield, and economic return. All botanical treatments significantly suppressed aphid populations compared with the control. The highest efficacy was recorded in Endod 7.5% (87.17%) and Tobacco 7.5% (82.12%), comparable to Dimethoate 40% EC (92.76%). Moreover, Endod 7.5% yielded the largest net benefit (762,138 ETB ha⁻¹) with a benefit–cost ratio of 6.69, the lowest yield loss (3.49%), and the highest marketable yield (49.78 t ha⁻¹). Increasing concentration and repeated applications enhanced performance. Therefore, Endod extract at 5–7.5% concentration is recommended as an effective, economical, and eco-friendly botanical option for sustainable cabbage aphid management in Ethiopia.
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