Ammonia as an attractant for adult Hybomitra lasiophthalma (Diptera: Tabanidae).

Ammonia and carbon dioxide were evaluated as attractants in canopy traps for Hybomitra lasiophthalma (Macquart). Ammonia-baited traps collected 2.5 times as many flies as did unbaited traps (33.27 versus 12.93 per trap per day). Over 45 times as many flies were captured in carbon dioxide-baited traps as in unbaited traps (1,630.64 versus 35.82 per trap per day). Both ammonia and carbon dioxide are effective attractants for H. lasiophthalma.