This study was done as part of my work for master degree. I Studied the responses of flies to visual decoys together with novel olfactory attractants for possible development of a sustainable bait technology.I found that the traps baited with octenol and phenols blend caught significantly more tabanids than did other traps baited with the rest of odours. I recommended that such baited Nzi traps can be used for control of biting flies associated with dairy farms in the Sudan