Abstract
The insecticide Dimilin was fed to larvae of the tobacco hornworm, Manduca sexta, throughout the 4th stadium. The effects were observed on the ultrastructure of the 4th-instar integument. Although post-ecdysial abdominal cuticle was laid down to the same extent in both experimental and control insects, the fine structure of the integument was very different after the two treatments. In particular the post-ecdysial cuticle of Dimilin-treated insects was granular in appearance and devoid of lamellae and the epidermal cells extruded cytoplasm apically. New 5th-instar cuticle was produced on time in experimental insects but the procuticle was again granular and non-lamellate.
Published Version
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