HISTOLOGICAL EFFECTS OF SELECTED PLANT EXTRACTS ON OVARY DEVELOPMENT OF THE MOSQUITO, CULEX QUINQUEFASCIATUS SAY (DIPTERA : CULICIDAE)

Petroleum ether extract of leaf and seed of Annona squamosa (40 ppm) and leaf and seed extract of Thevetia neriifolia (200 ppm) treated larvae were reared to adult stage and used in the histological studies as the petroleum ether extracts of these plants were found to be effective compared to chloroform and ethanol extracts. In petroleum ether extract of A. squamosa and Tneriifolia leaf treatment, the follicular epithelium showed distur" ind pycnosis of the nucleus and yolk granules receded away from the follicular epithelius' 'evacuolation in the ooplasm and loss of compactness and disintegration of yolk granui :served.