| OCR Text |
Show 188 acceptable to man. A parasitic wasp, Urolepis rufipes ( Ashmead) found in Ephydra cinerea collected at Antelope Island, is considered a potential means of biological control that should be further explored. ( Nabrotzky, Rosay and Sadler, 1973) Recent efforts at chemical control in restricted areas and rather limited amounts have been successful in reducing adult fly densities for several hours to several days. However, the flies in the treated areas are replaced by an influx of young flies brought onto the beaches, often aided by on- shore winds. The chemicals used are malathion and AOWCO 214, selected for their low toxicity to man and other organisms and effectiveness in destroying the adult brine flies. Malathion has been applied effectively with thermal foggers mounted on ground equipment and boats and in ultra low volume ( ULV) by aircraft. AOWCO 214 has been applied in ULV by aircraft. During 1974, the construction of off- shore barriers and the use of hand portable chemical applicators have shown considerable promise as control methods. Mosquitoes Mosquitoes are extremely numerous at times on or near the Great Salt Lake. Their persistent attempts to take a blood meal makes them annoying and the effects of their bite may be irritating for hours after inflicted. In addition, certain species present are capable of transmitting the viruses of encephalitides to man and animals. Mosquitoes are one of the major deterrents curtailing the current use of and future development of the resources of the Great Salt Lake. The extent of their damage is determined by the species present, abundance, distribution, feeding habits, the response of the victim to their attacks and extent |
