FIELD EVALUATIONS IN MALAISE AND CANOPY TRAPS OF SELECTED TARGETS AS ATTRACTANTS FOR TABANID SPECIES (DIPTERA, TABANIDAE)

Various configurations of an inflated vinyl beach ball covered with bl ack fabric were evaluated in Malaise and canopy (modified Manitoba) tr aps for possible use as an insecticide-impregnated visual target (T) f or Tabanidae. In Malaise traps, T attracted 2X more flies than no T. W hen inflated with carbon dioxide, T was not significantly different fr om T filled with air, no matter which type of trap it was in. In canop y traps, 2 or 4 white spots applied to T did not increase its attracti veness to tabanids. When treated with octenol, T was 2-5X more attract ive than an untreated T in canopy traps. However, when an octenol trea tment was aged for 48 h, it was less effective than a fresh treatment. Overall, the 3 most frequently collected species, in order of abundan ce, were: Tabanus lineola hinellus, Hybomitra vicina and Chrysops atla nticus. Significantly more T. l. hinellus and H. vicina were collected at T with octenol than at T without octenol. Attempts to detect an in secticidal effect on flies captured in both types of trap that had bee n baited with Ts treated with permethrin were unsuccessful.