Evaluation of tea tree oil formulations contact and stomach toxicity against the Egyptian cotton leafworm, Spodoptera littoralis (Boisduval, 1883) (Lepidoptera: Noctuidae)

The insecticidal potential of tea tree oil formulations was tested for contact and stomach poison toxicities against various stages the Spodoptera littoralis ((Boisduval, 1883) (Lepidoptera: Noctuidae) larvae under laboratory conditions. study carried out at Yozgat Bozok University Faculty Agriculture between 2020 2021. In toxicity test, were different by topical application. Among formulations, TTO (100%), F14 (91.72%), F15 (89.20%) caused highest mortality in S. 3rd stage after 72 h. Dose-response bioassay with most promising (TTO, F15) revealed that LD50 values 0.016, 0.046, 0.076 μg/larvae TTO, F14, F15, respectively. effects applying a 0.16 μg/cm$^{2}$ dose to lettuce leaf discs. F17 F18 produced rates 75% 65% 10 days incubation, calculated LC$_{50}$ these 0.027 0.042 These results its main components containing have controlling this destructive lepidopteran pest species.