OCR Text |
Show 193 Although no extensive efforts have been made in Utah to control tabanids, some experimental control measures were applied and reported by Rees and Knudsen ( 1969). They report that, " An appreciable reduction in the numbers of tabanids on these marshes can be attained by proper water management and a limited use of insecticides. Water management consisting of maintaining impoundments at constant levels, accomplished through the use of adequate channels, dikes and spillways will delay emergence of C. discalis and thus shorten the season in which the adults are present. This will also force tabanid larvae to concentrate on margins of impoundments ( to pupate) in district zones where they can be readily treated with insecticides prior to emergence." Based on their study, it can be assumed that " Stickem" traps baited with GO2 have a potential use for the control of tabanids. Larger traps in greater numbers and in selected areas may substantially reduce tabanid populations. The cost of large scale operations of such traps for control purposes may, however, prohibit their use. Gnats " Gnats" is the common name referring to several families, genera and species of insects in the order Diptera. Gnats are commonly classified as biting or nonbiting, both of which are present in abundance on the marshes and create considerable annoyance to man and other animals. The biting gnats are present in greatest numbers and are most annoying around the Great Salt Lake from about the middle of April until the end of June. The nonbiting are present from April to early November. At times, the nonbiting adult gnats are present in such great numbers along the shores |