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The plants have well-developed defense mechanisms against pests and are excellent sources of new insecticidal substances. Materials and methods: An experiment was conducted on Hamedan Agricultural Research Center, as factorial based on completely randomized blocks in 3 replications during 2009. Experimental treatments included 10 levels concentration with Cinnamomum zeylanicum (0, 5, 10, 15, 20, 25, 75, 100, 200, 300) μl, 7 levels concentration with Thymus vulgaris (0, 0.25, 0.50, 0.75, 10, 20, 30) μl, 6 levels concentration with Ferula assafoetida L (0, 30, 60, 90, 120, 150) μl as the time at 3 levels (8, 24, 48) hours as the second factor. 1 ml of solutiones were applied on filter papers with Whatman No. 1. Then each dried paper was placed and 10 C. maculatus adults was placed. Each set of treatment was repeated 3 times and number of dead insects in was counted at an interval of 8, 24, 48 hours respectively. Original Research Article Estekhdami et al.; AJAAR, 13(2): 52-62, 2020; Article no.AJAAR.49703 53 Conclusion: Percentage mortality was calculated. It has been results that the C. zeylanicum, T. vulgaris, F. assafoetida L essential oils showed 13%, 56%, 10% mortality adult of C. maculatus at dose of 5 μl of C. zeylanicum, 0.25 μl of T. vulgaris, 30 μl of F. assafoetida L respectively. Further concentration increase to 300 μl of C. zeylanicum oil, 30 μl of T. vulgaris, 150 μl F. assafoetida L yielded mortality of 100% against adult C. maculatus respectively.

Insecticidal Efficacy of Essential Oils from Cinnamomum zeylanicum, Thymus vulgaris, Ferula assafoetida L on Callosobruchus maculatus F