Paper Title
Interactions Between Orius Albidipennis Reuter And Aphidius Colemani Viereck For The Control Of Aphis Gossypii Glover On Greenhouse Cucumber

Abstract
Aphis gossypii is an important cucumber pest in green house and field conditions. The efficacy of simultaneous release of generalist predator, Orius albidipennis, and a specialist parasitic wasp, Aphidius colemani, was evaluated in laboratory conditions against the pest. For this purpose, investigations were carried out on preference of the predator between parasitized and unparasitized aphids. In addition, production of volatile infochemicals between the natural enemies (NEs) were studied by olfactometry trials. In another part of this research, systemic production of volatile synomone by the infested cucumber plants for attraction of each NEs was examined by the olfactometry tests. Results revealed that between the parasitized and unparasitized aphids, the O. albidipennis had no obvious preference, while both NEs are significantly attracted to volatiles which are emitted from infested host plants. Our findings revealed that each of the NEs avoided odors which indicated the presence of another intraguild competitor. The documented facts from the entire study reveals that the NEs are good bio control agents against A. gossypii on cucumber, but avoidance of the natural enemies from each other causes simultaneous release of the predator, and parasitic wasps are not suitable options for biological control of aphids. Key words - Predatory bug, parasitic wasp, simultaneous release, infochemicals, aphid biocontrol