Field studies on aphid species on cabbage were conducted from 1982 to 1984. Brevicoryne brassicae L. commonly occurred on cabbage in Jos Plateau. No aphids were observed on plants transplanted in November 1982 within the first 2 weeks while those transplanted in January 1984 and February 1983 and 1984 usually had a weekly mean of more than five aphids/plant which necessitated application of aphid control treatment. High uncontrolled infestations of B. brassicae on plants aged 2–3 weeks after transplanting usually resulted in stunted growth, plant death and low yields. Decis at 7.5, 12.5 and 17.5 g a.i./ha, dichlorvos at 500, 750 and 1000 g a.i./ha, carbofuran 3 G at 1000 g a.i./ha, carbaryl 85 at 1000 g a.i./ha, and hand-washing of plants with water were used in the study. Decis, dichlorvos and carbofuran applied at 12.5, 750 and 1000 g a.i./ha respectively, were more effective in B. brassicae control. The overall cumulative mean number of B. brassicae/plant on untreated plants were 1300, 1087, 1672 and 565 for crops one to four respectively. For each crop the mean aphid number on untreated plants was significantly higher (P < 0.05) than those on treated plants. For each of the 1984 crops the yields (kg/head) from treated and untreated plants, did not differ significantly (P > 0.05), but for each of the 1982 and 1983 crops, the yields from treated and untreated plants differed significantly (P < 0.05). Plants receiving the washing technique of aphid control out-yielded untreated plants while carbofuran treated plants generally out-yielded plants receiving all other treatments.