[Objectives]  To determine the electroantennogram (EAG) and behavioral responses of Locusta migratoria to 2 gramineous plant volatiles (decanal and linalool) and thereby contribute to understanding the olfactory mechanisms of the locusts. [Methods]  The EAG responses of 4th-instar nymphs to four different dosages of decanal and linalool were investigated using electroantennography and the behavioral responses of the locusts under normal conditions to four different dosages of decanal and linalool were determined with an olfactometer. The effects of decanal and linalool on the behavioral responses of food deprived and satiated locusts were also investigated. [Results]  EAG response tended to first increase, then decrease, with increasing dosages of decanal and linalool up to a maximum of 500 μg. There were significant differences in the EAG responses of female and male locusts to this dosage. Under normal conditions, 1 000 μg of linalool was significantly attractive to both sexes. Male and female locusts were significantly attracted by 1 500 μg of decanal and linalool and 500 μg of decanal, respectively. Food deprived, females were significantly attracted by 500 and 1 000 μg of decanal whereas food deprived males were significantly attracted by 250 μg of decanal. Five hundred micrograms of linalool significantly attracted both sexes. Satiated female locusts were significantly attracted by 250 and 500 μg of linalool. Linalool was more attractive to males that had been food-deprived than satiated males. Significantly more food-deprived locusts were attracted by 500 μg of linalool than satiated locusts. [Conclusion]  The EAG responses of the locusts to 2 plant volatiles were dose-dependent and differed significantly between the sexes at the optimum dose. Different dosages of decanal and linalool elicited different behavioral responses. Food-deprived locusts were more attracted by linalool than satiated locusts.