Toxicity Effect of Ethanolic Leaf Extracts of Mentha arvensis and Nerium oleander on Larva of Ectomyelois ceratoniae Zeller (Lepidoptera: Pyralidae)

Abstract

The ethanolic extract of two plants Mentha arvensis (Lamiaceae) and Neriumoleander (Apocynaceae) were tested for direct toxicity action on last phase larvaeof Ectomeylois ceratoniae (Lepidoptera: Pyralidae),one of the most serious pests onpomegranates and other trees. Three sets of Concentration 2.5%, 5% and 7.5%were tested. Percent mortality was recorded at intervals of time for each plantextract. Data analysis was made by using Complete Randomized Design (CRD).The results showed that mortality effect varies according to extract type,concentration and time period .The time 12 h showed higher insecticidal effect withthe tested plants, Strong toxicity effect was observed at concentration 7.5 %. TheLT50 values were 1.10, 1.05 and 0.30 for Mentha arvensis and 1.75, 1.48 and 0.90for Nerium oleander.