In contemporary ecological technologies, botanical pesticides are an alternative to synthetic chemical pesticides for pest management. These products pose no risk to the environment or to people's health. Plant extracts are preferred in contemporary organic agriculture due to a number of benefits. These items' variety is always growing, therefore it's important to understand how they work. This research was done to determine the toxicological effect of (Costunolide, Ottelione and Menthol) as plant extracts against Aphis gossypii. The result obtained that, the total mortality was 96.66%, 96.67% and 70% at the concentration of 5000, 1000 and 5000 from menthol, costunolide and ottelione, respectively. Generally with increasing the concentrations of plant extracts studied led to more mortality. Costunolide is the most effective compound that has sublethal concentration LC50, 81.9ppm followed by menthol with LC50 455.6 ppm then ottelione with LC50 1615.8 ppm. The most effective plant extract was Costunolide (Ti=100%), while the toxicity index being 17.97 and 4.15 % for Menthol and Ottelione, respectively. Now we have another option for eradicating this pest by the strong efficiency demonstrated by this plant extracts.