Simple SummaryWe used the geometric morphometrics method to explore whether the exposure of the parental females to pirimiphos-methyl at short exposure times may impact the wings of the F1generation ofRhyzopertha dominica,Prostephanus truncatus, andTenebrio molitor. For this purpose, adult females of the three coleopterans were exposed to treated concrete at the label dose for 30 min, 3, 5, 8, 16, 24, and 36 h. Their offspring responded differently to pirimiphos-methyl. The most noticeable deformations were observed in the elytra and hindwings ofT. molitor, and males experienced deeper morphological changes than females. The hindwings ofP. truncatusexhibited morphological deformations after 36 h of exposure to pirimiphos-methyl.Rhyzopertha dominicaproved the least susceptible species since pirimiphos-methyl did not have any effect on both elytra and hindwings.AbstractTenebrio molitorL. (Coleoptera: Tenebrionidae),Prostephanus truncatus(Horn), andRhyzopertha dominica(F.) (Coleoptera: Bostrychidae) are noxious insect pests of grains in storages. Pirimiphos-methyl is widely used to protect grains at the post-harvest stage. However, the sub-lethal impact of this active ingredient on the offspring of all three coleopterans remains unknown. Thus, mated females of each species were exposed separately to pirimiphos-methyl at short exposures (30 min, 3, 5, 8, 16, 24, and 36 h), where the elytra and hindwings of the adult progeny were analyzed with the geometric morphometrics method. Males and females of all species were incorporated into the analysis. The results revealed variability among species.Tenebrio molitorwas the most sensitive among three species, displaying significant deformations in the elytra and hindwings. Males had more conspicuous morphological changes than females.Prostephanus truncatushindwings exhibited deformities after 36 h of exposure to pirimiphos-methyl. In contrast,R. dominicaoffspring were not affected by pirimiphos-methyl. In light of our findings, organophosphorus insecticides may cause variable sub-lethal effects to stored-product insects. This issue may lead to different insecticidal treatments according to the targeted stored-product species.