OCR Text |
Show 191 parasitize the adults and immature stages include many different species of micro- organisms, anthropods, amphibians, reptiles, fish, birds and mammals. Some of these natural enemies of mosquitoes may be present in sufficient numbers in the more permanent and stabilized bodies of water to control them in their immature stages but are rarely present in temporary or semi- permanent water to be effective in mosquito control on the marshes near the Great Salt Lake. The control of adults by natural enemies has apparently never been adequate to reduce the adult population, throughout the season, to numbers acceptable to man. Depending on the location, from 60 to 90 percent of mosquito breeding areas around the Lake have been made by man in his attempt to divert and utilize the reusable water. Applied mosquito control has proven effective on these marshes in the areas where organized Mosquito Abatement Districts have been operating. This control has been accomplished without greatly interfering with the major objectives of the water users. The effective control measures used are: 1) improved water management practices; 2) stocking of certain areas with Gambusia fish that feed on mosquito larvae and pupae; 3) regular inspection of potential mosquito breeding areas; and 4) treatment with chemicals of those areas where larvae and pupae are abundant and occasionally where adults are present in sufficient numbers to justify the use of chemical adulticide. Tabanids-- Deer and Horse Flies Due to their abundance and feeding habits, deer flies and horse > flies on the Great Salt Lake and vicinity are extremely annoying to man and animals. The females are persistent in their attacks and their bite, |