The Effect of Alkaloid and Phenolic Extracts of Some Plants on the Biological of the Periplaneta Americana

The study was conducted to determine the extent of the effect of some plant extracts on the death of some of the biological stages of the Periplaneta americana, it tested two types of terpenoids extracts and the alkaloid extract of Xanthium strumarium and Achillea L. the extract of terpenoids and alkaloid compounds of the Achillea L in killing eggs, and it was also noted that the extract of terpenoids in both the X.strumarium and Achillea L was superior to the rest of the extracts of the same two plants. The two extract recorded an effect on the adults of the P.americana, as it was noted that the terpenoids and alkaloids of the extract were clearly superior to the X.strumarium, it was also noted that the superiority of the alkaloid extract in the X.Strumarium. We also note that there is a direct relationship between the concentrations of the extract and the percentage of death. The extracts work to kill insect eggs in several ways that have a physiological effect, including that they contain a percentage of oils that cover the surface of the eggs with a thin layer that prevents the exchange of gases between the egg embryo and its external environment, it hardens, thus preventing the egg shell from hatching, or the penetration of the extract into the egg, which affects the protoplasm, leading to the killing of embryos, or the inhibitory effect of the terpenoids compounds present in the extract of the two plants, which affects the growth of the embryos of these eggs.