Automatic pyrethrum aerosol dispensers are used for the control of flies and other flying insects in residential and commercial situations. These automatic dispensers periodically give a burst of pyrethurm based insecticide. The time interval between bursts can be set to 5, 10 or 15 minutes for the indoor model and 30, 60 or 120 seconds for the outdoor model. Being pyrethrum based these dispensers are suitable for use around food products and food processing areas. They are suitable for domestic use as well as in commercial situations such as cafes, restaurants, pubs & clubs, hotels, fruit shops, food manufacturing, commercial kitchens, supermarkets, etc.