Abstract
Sex pheromone traps and visual observation stake counts were used to investigate daily and generational flight activity, and relative efficiency of pheromone traps for the day-flying moth, Harrisina brillians Barnes & McDunnough. A total of 19 intraday studies were conducted during the second and third annual moth flights of 1986 and 1987 in a central California grape vineyard. Visual counts and pheromone trap data indicated that daily peak flight occurred near 0800 hours. H. brillians adult males were most active in the early morning, with substantially fewer moths detected after midmorning. From 0600 to 1000 hours, >90% of the moths observed in the stake count zones were males. For the remainder of the day, a greater portion of flying H. brillians moths were represented by females. Pheromone trap count curves were frequently bimodal. This pattern of bimodality may result from competition between synthetic lures and female moths emitting pheromones.
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