Abstract: To screen effective pheromone formulas suitable for trapping Maladera spp. adults in tobacco field, agar-gel encapsulation slow-release technology was employed, and phenylacetaldehyde, geraniol, ethyl 2-methylbutyrate, isobutyl acetate and benzyl acetate was used as active components to prepare 4 binary and 3 ternary constituent pheromone attractants. The trapping efficacy of different formulas was compared by conducting systematic field trapping experiments in tobacco fields in Bijie, Guizhou. The results showed that there were significant differences in trapping efficacy among the test formulas, and the ternary formulas were overall superior to the binary ones. Among them, formula BXY (phenylacetaldehyde: geraniol : isobutyl acetate = 3∶1∶1, mass ratio) exhibited the best trapping efficacy for Maladera spp., and the average number of adults trapped per trap was 5.9. Formula BYE (phenylacetaldehyde ∶ isobutyl acetate ∶ ethyl 2-methylbutyrate = 3∶1∶1) exhibited the highest specificity for Maladera verticalis, with an average of 4.1 adults trapped per trap. The ternary pheromone formulas with phenylacetaldehyde as the core component showed good trapping potential for Maladera spp. adults. Among them, formula BXY can be used as an attractant for the control of Maladera spp. adults.