Recent scientific evaluations of the performance of electronic and ultrasonic mosquito repeller devices have indicated that they have no significant effect on mosquito behavior.
Electric and black light "bug zappers" are not effective in reducing the biting mosquito population.
The scented geranium plant , Pellargonium sp., more commonly known as the Citrosa "Mosquito Fighter" plant, has little proven merit and further research is needed to demonstrate any mosquito repelling qualities that it may possess.