~ 696 ~ Journal of Entomology and Zoology Studies 2016; 4(6): 696-699 E-ISSN: 2320-7078 P-ISSN: 2349-6800 JEZS 2016; 4(6): 696-699 © 2016 JEZS Received: 02-09-2016 Accepted: 03-10-2016 Kanwer Shahzad Ahmed Department of Entomology, University College of Agriculture, University of Sargodha, Punjab, Pakistan Naveed Haider Department of Entomology, University of Agriculture, Faisalabad, Punjab, Pakistan Muhammad Asghar Ali Department of Agronomy, University College of Agriculture, University of Sargodha, Punjab, Pakistan Waqas Raza Department of Plant Pathology, University College of Agriculture, University of Sargodha, Punjab, Pakistan Muhammad Hamid Rasheed Department of Entomology, University College of Agriculture, University of Sargodha, Punjab, Pakistan Muhammad Sharif Institute of Horticultural Sciences, University of Agriculture, Faisalabad, Punjab, Pakistan Muhammad Ather Rafi National Insect Museum, National Agricultural Research Centre, Islamabad, Pakistan Correspondence Kanwer Shahzad Ahmed Department of Entomology, University College of Agriculture, University of Sargodha, Punjab, Pakistan In vitro evaluation of different synthetic insecticides against oriental fruit fly, Bactrocera dorsalis Hendel Kanwer Shahzad Ahmed, Naveed Haider, Muhammad Asghar Ali, Waqas Raza, Muhammad Hamid Rasheed, Muhammad Sharif and Muhammad Ather Rafi Abstract The oriental fruit fly, Bactrocera dorsalis (Hendel), is a devastating insect pest that causes large losses and acts as an export barrier for many fruits and vegetables globally. This study evaluated the toxicity of Imidacloprid 25% Wp (Advance Agro ® ), Trichlorfon 80% SP (Avari ® ) and Emamectin benzoate 1.9% EC (Welcon ® ) applied as bait against adults of B. dorsalis under laboratory conditions (26.0 ± 2.0 °C and 70.0 ± 5.0% R.H.). Experiment was conducted under Completely Randomized Design (CRD) with factorial arrangements through which mass reared adults of B. dorsalis were treated with three concentrations (2, 4 and 8 ppm) of each insecticide along with a control treatment having no insecticide. Mortality percentage of these flies was recorded after 24 and 48 h post treatment. Results revealed that Trichlorfon showed highest mortality (100%) followed by Emamectin benzoate (70%) and Imidacloprid (69.44%) respectively. Keywords: Bactrocera dorsalis, emamectin benzoate, imidacloprid, percent mortality, trichlorfon 1. Introduction Oriental fruit fly, Bactrocera dorsalis Hendel belongs to largest genus Bactrocera of family Tephritidae. Among all families of Diptera, Tephritidae has about 4000 described species worldwide [1] . It infests vigorously about 100 host plants including many types of commercial fruits and vegetables, such as citrus, mango, guava, melon, cherry, pear, peach and tomato, cucumber and bitter gourd [2] . It was first reported from Taiwan in 1912 and now it is established in the Asia Pacific region [3] . Adults of B. dorsalis are strong flyer and can travel 30 miles in search of food and sites to lay eggs. Their females lay eggs into host fruits in groups of 3 to 30; the female can lay more than 1,000 eggs in her whole life. Maggots come out from these eggs and feeding on the pulp of host fruits and pass over three instars and pupate under the soil. Adults live 90 days on the average and feed on honeydew, decaying fruit, plant nectar and bird dung [4, 5] . Infestation of B. dorsalis on fruits not only deteriorates its appearance but also make consumer unable to eat these infested fruits. These fruit flies are not only the production restrainer of many potential fruits and vegetables, but certainly act as export barrier for a potential multimillion dollar worldwide trade. Philippines and Malaysia faced a strict quarantine regulations while exporting fruits and vegetables to worldwide market due to the fruit flies [6, 7] . In USA, about 80% of guava fruits in markets were infested by B. dorsalis [8] . The damage caused by fruit flies varied according to insect pest species and the host plant species on which these attacked. B. dorsalis Hendel, B. correcta Bezzii and B. zonata Saunders caused 80, 60-70 and 3-100% loss in guava fruit respectively [9, 10] . Fruit fly management is mostly rely upon the use of insecticides either synthetic or botanical such as dipterex, imidacloprid, triazophos, diazinon, deltamethrine, cypermethrin and neem products [11-13] and these insecticides are used as mixed in protein baits because female fruit flies do not develop eggs unless protein is not given to them as feed so this is why protein baits mixed with insecticide are an effective control method [14, 15] . Keeping in view the overall importance of this pest the current study was conducted to evaluate some synthetic insecticides against oriental fruit fly to find the most effective one.