ABSTRACT
The effect of LC50 of the isolated dill apiol compound and pyriproxyfen caused significant prolongation in the first gonotrophic cycle and great reduction in the percentage of female [Xenopsylla cheopis] reproductive potential as well as egg hatchability. The results indicated that, the larval treatments inhibited the ovarian development and evolved drastic changes in the ovarian histology and histochemistry. The two tested compounds reduced the vitellogenesis and synthesis of carbohydrates, protein, DNA and RNA materials and lipids in oocytes. The two compounds are similar in their mode and site of action
Subject(s)
Anethum graveolens , Ovary , Histology , Siphonaptera , Carbohydrates/chemical synthesis , Proteins/chemical synthesis , DNA , Oocytes , ReproductionABSTRACT
The fixed oil extracts from Thevetia peruvine, Datura stramonium and Acacia sp were tested on Culex pipiens larvae. The estimated sublethal concentrations [LC50] were used in the present study. The reproductive potential of females and the histochemistry of their ovaries were determined. The results indicated that oil treatments of larvae caused drastic changes in reproduction potential of female mosquito including the ovarian development in the first gonotrophic cycle, fecundity and fertility of treated females. Histological and histochemical studies revealed clear changes in the oocytes of females derived from treated larvae. Treatment with the oils reduced the vitellogenesis, synthesis of proteins, carbohydrates, lipid contents, DNA and RNA materials. The reproduction was always significant and may reflect the shortage in reproductive potential, the state of being disturbed. Generally, these fixed oils merit further investigations as a potential suppressant of Culex pipiens because their abilities to kill the early stages inhibit growth and development of ovaries and reduce the reproductive potential of adult females. The three oils have variable activities but they are similar in their mode and site of actions