In greenhouse and field studies, liquid and granular combinations of disulfoton and cycloate at 1 and 4 lb AI/acre, respectively, were incorporated in soil before planting sugarbeets. In the greenhouse, the stand of sugarbeets and dry weights of seedlings were reduced most by the liquid-herbicide granular-insecticide treatment. In the field study, the disulfoton-cycloate mixtures produced necrotic cotyledons and leaves, as well as extensive stunting. The liquid-herbicide liquid-insecticide mixture was the most damaging combination, followed by the granular-herbicide liquid-insecticide, liquid-herbicide granular-insecticide, and the granular-herbicide granular-insecticide treatments. Mixing the herbicide with the insecticide did not reduce the ability of the herbicide to control weeds effectively: injured sugarbeet seedlings recovered fully after 3 months of growth and there was no significant difference between root weights, percent sucrose, or sucrose production for the various treatments at harvest.