We tested the response of individual adult lubber grasshoppers in a wind tunnel to the odors of 3 plant species and to water vapor. Grasshoppers moved upwind to the odors of fresh-mashed narcissus and mashed Romaine lettuce, but not to water vapor, or in the absence of food odor. Males and females showed similar responses. Upwind movement tended to increase with the length of starvation (24, 48, or 72 h). The lack of upwind movement to water vapor implies that orientation toward the mashed plants was not simply an orientation to water vapor. These results support a growing data base that suggests that grasshoppers can use olfaction when foraging in the wild.