A study was carried out to evaluate the combined effect of planting date, organic fertilization and cabbage varieties on cabbage and turnip aphids. The randomized complete blocks design with three replications and two varieties were used. Three organic fertilizers; compost (10 t.ha-1); the mixture: poultry manure 25% and compost 75% (10 t.ha-1); poultry manure (10 t.ha-1); the positive control, the mineral fertilizer NPK 20-10-10 (300 kg. ha-1) and the negative control. Aphid and syrphids counting was weekly done from the second week after transplantation to two weeks before harvest. The results obtained showed that Brevicoryne brassicae, Lipaphis pseudobrassicae, are present in all plots. Infestation peaks ranged from 21 to 28 DAT for B. brassicae and between 21 and 35 DAT for L. pseudobrassicae. The abundance of aphids of both species was significantly lower (P=0.0001) in plots with poultry manure compared to plots without fertilization. The dry season was more favourable than the rainy season for both species. B. brassicae was more important in compost plots and mixing on the other hand L. pseudobrassicae was more common in mixing plots. Green Coronet hosted more aphids in both growing seasons than Green Boy, 10.80±2.13 to 23.97±3.13 and 11.13±1.66 to 39.04±2.83 respectively for B. brassicae and L. pseudobrassicae in the dry season and 0.00±0.00 to 2.28±0.97 and 0.06±0.04 to 4.19±0.90 respectively in the rainy season. For average cabbage yields, Green Coronet recorded 15.38 t.ha-1 and Green Boy 16.16 t.ha-1 in the dry and in the rainy seasons, Green Coronet recorded 12.00 t.ha-1 and Green Boy 12.35 t.ha-1. In summary, poultry manure and mixture are recommended because they give the highest yields for both cabbage varieties.