Predominant accumulation of a 3-hydroxy-γ-decalactone in the male rectal gland complex of the Japanese orange fly, .

The Japanese orange fly, , infests various citrus crops. While male pheromone components accumulated in the rectal glands are well characterized for , but information regarding the chemical factors involved in the life cycles of remains scarce. Herein, several volatile chemicals including a γ-decalactone, (3,4)-3-hydroxy-4-decanolide [(3,4)-HD], were identified as major components, along with acetamide and spiroketals as minor components in the rectal gland complexes of male flies.