Environmental Entomology (1992) 21, 112-116

Wesley C. Carr Jr., William J. Roltsch and Mark A. Mayse (1992)
Diurnal and generational flight activity of the western grapeleaf skeletonizer (Lepidoptera: Zygaenidae): Comparison of monitoring methods
Environmental Entomology 21 (1), 112-116
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 and 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): William J. Roltsch

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution
pheromones/attractants/traps

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Harrisina metallica	Grapevine (Vitis)	U.S.A. (SW)