The volatile oils of golden pillar, Cupressus macrocarpa and galangal, Alpinia officinarum were extracted and their constituents were identified. Alpha pinene and trans-caryophyllene were the major isolated constituents of C.  macrocarpa oil, and 1,8 cineole and 4-terpeniol were the major compounds of A.  officinarum oil. The present study revealed that the botanical volatile oils used, had morphogenic effects against S. nudiseta stages. Theseincludelarval-pupal intermediates, pupal-adult intermediates, deformed adults with crumpled wings and/ or deformed thorax and abdomen. Also some adults couldn't emerge and remained in their puparia. The histological effects induced by oils treatment in the body wall were represented by degeneration and detachment of hypodermis and dissolving of the exocuticle in some regions. The histopathological effects that appeared in the midgut were shrinkage in some epithelial cells and swelling of other cells.