Histological sections of the salivary gland (row A), midgut (row B), and hindgut (row C) of Drosophila suzukii. I) Normal control groups post-treatments acetone only (20×). A II–IV: salivary gland treated with α-pinene, details on the vacuolization of secretory ducts, lumen deformation, and nucleus condensation with polytene chromosomes. B II–IV: Midgut showed marked intestinal tract necrosis with condensation of chromatin, pyknotic nuclei, and loss of brush border architecture after exposure to camphor. C II–IV: Detail of the pyknotic nuclei in the hindgut of D. suzukii treated with 1,8-cineole. Note: SG – salivary gland, v – vacuolization, l – lumen, pn – pyknotic nuclei, MG – midgut, bb – brush border, HG – hindgut. Stain: Harris hematoxylin and eosin.