Iman Sharifian Ali Darvishzadeh Young Researchers and Elite Club, Izeh Branch, Islamic Azad University, Izeh, Iran Young Researchers and Elite Club, Karaj Branch, Islamic Azad University, Karaj, Iran Arthropods ISSN 2224-4255 http://www.iaees.org/publications/journals/arthropods/online-version.asp 2015 4 2 38 45 International Academy of Ecology and Environmental Sciences Hong Kong 30 October 2014 5 December 2014 1 June 2015 Echinophora platyloba chemical composition insecticidal efficacy contact toxicity fumigant toxicity stored products beetles Essential oil of Echinophora platyloba was screened for its chemical composition and possible fumigant and contact toxicity effects against Tribolium castaneum (Herbst), Callosobruchus maculatus (F.) and Rhyzopertha dominica (F.). Aerial parts were subjected to hydrodistillation and obtained oil chemical composition was analyzed by GC-MS. (Z)-beta-ocimene (33.06 percent), p-cymene (10.98 percent) and Limonene (5.77 percent) were major constituents. Fumigation tests were performed for 24, 48 and 72 h, while contact toxicity of essential oil was evaluated in 24h. Experimental units were located in 25+-2 Celsius degree and darkness condition. In contact toxicity evaluation tests T. castaneum (LC50= 14.712 ul/39cm2) was more tolerant and R. dominica (LC50= 9.712 ul/39cm2) was more susceptible species. After 24 h, T. castaneum (LC50= 39.658 ul/250 ml air) and C. maculatus (LC50= 3.835 ul/250 ml air) were more tolerant and susceptible species in fumigation bioassays, respectively. In general, mortality increased as the doses of essential oil and exposure time increased. DOI 10.0000/issn-2224-4255-arthropods-2015-v4-0005 http://www.iaees.org/publications/journals/arthropods/articles/2015-4(2)/essential-oil-of-Echinophora-platiloba.pdf