J. M. Domek, D. T. Johnson; Demonstration of Semiochemically Induced Aggregation in the Green June Beetle, Cotinis nitida (L.) (Coleoptera: Scarabaeidae). Environ Entomol 1988; 17 (2): 147-149. doi: 10.1093/ee/17.2.147
A trapping study was conducted in an apple variety block to determine if feeding green June beetles (GJB), Cotinis nitida (L.) (Coleoptera: Scarabaeidae), produce semiochemicals that induce their aggregation. Yellow baffle and funnel traps were baited with fruit only (ripe peach slices), three males and three females (no fruit), six males (fruit access blocked), six males (free access to fruit), six females (fruit access blocked), and six females (free access to fruit). Traps were arranged in a Latin cube design (six row × six column) and randomized daily for 6 d. Analysis of data showed that column, day, treatment, and day by treatment interaction were significant sources of variation (P < 0.01). Males or females feeding on ripe peach attracted significantly higher numbers of male and female beetles than all other treatments (Waller-Duncan k-ratio t test, k = 100, P < 0.05).