Abstract
The main source of the sex pheromone in adult female Estigmene acrea (Drury) is on the dorsal surface of the 9th abdominal segment. The glandular epithelium is situated on the internal surface of the padlike structures (papillae anales or ovipositor pads) on the dorsal and lateral areas of this segment. These structures are spread apart by the eversion of the 8th and 9th segments which exposes the attractant-producing epithelium to the air. The glandular epithelium is composed of a very thin epicuticle covered with hollow outgrowths and a procuticle. No pores are evident in the cuticle through which the pheromone can pass. The histochemical tests revealed that glucoses-6-phosphate dehydrogenase and succinate dehydrogenase activity is high in newly emerged females and decreases with the age of females. The α-glycerophosphate dehydrogenase and lactate dehydrogenase activity is low or absent. The acid and alkaline phosphatase activities are low, and the unspecific esterase and cytochrome oxidase activities are high in newly emerged females and do not change with age.
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