This work aims to study the effect of the nutrient contents in the leaves of co on the incidence of Spodopterafrugiperda (Smith) (Lepidoptera: Noctuidae) and Dalbulus maidis (Delong & Wolcott) (Homoptera: Cicadellidae). The treatments were represented by unfertilized co plants and co plants fertilized with 250 kg of the formulation 4-14-8 (N-P-K) +100 kg of ammonium sulfate (AS)/ha and 500 kg of the formulation 4-14-8 (N-P-K) +200 kg of AS/ha, arranged in randomized blocks with four replicates. Attacks by S.frugiperda and D. maidis were higher as the nitrogen, sulfur, calcium and copper content in the leaves of co increased. The effects of calcium and copper found in this study were not consistent with that of lower susceptibility associated with higher levels of these nutrients mentioned in the literature. We believe that there was a cumulative effect of the nutrients altogether, building up a nutritiously better vegetable which in tu had less reserve for defense, or that the content of both nutrients in the leaves were not high enough to induce such effects.