Sumarry Two experiments in the chemical control of the cabbage aphid are described: (1) In the first, Metasystox at rates of 4, 6, 8, and 10 oz active ingredient in 30 gal of water per acre applied to leafy swedes gave reduction of the pest significant at the 1% level. (2) In the second trial, 2 oz active ingrectient per acre of Metasystox (i) (Methylisosystox) was the best treatment. At the 1 % level it was significantly better than Rogor at 8 oz or PP 175 at 6 oz. These were better than 12 oz of Lebaycid, which was better than 8 oz of Endothion. This last material was better than no treatment at the 5% level only, all material being applied in 20 gal of water to a seed crop of chou moellier in the early spring.