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1 December 2001 Flight Characteristics and Dispersal Patterns of Fall Webworm (Lepidoptera: Arctiidae) Males
Takehiko Yamanaka, Sadahiro Tatsuki, Masakazu Shimada
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Flight characteristics and dispersal patterns of male fall webworms, Hyphantria cunea (Drury), were investigated in three experiments: a flight-mill experiment to estimate potential flight metrics, a wind-tunnel experiment for daily patterns of male activity, and field trials of mark-recapture for estimating dispersal patterns of males in the field. In the flight-mill experiment, males had the potential to fly over 7 km after 12 h on average and, at maximum, longer than 23 km. However, the wind-tunnel experiment revealed that a sharp peak of male response was limited to 1 h around the light-on time both in response to a synthetic sex pheromone lure and to virgin females. Thus, the actual flight period of males is limited in the field. In the mark-recapture experiment, the mean distance between recapture points and the release point on the first day was <200 m in both summer and autumn. The largest number of males was captured in the first concentric on the first and the second day despite a few males that were captured outside the first concentric. Male density seemed to be diluted uniformly and distributed outside the first concentric after the fourth day. Thus, H. cunea males did not disperse over long distances, rather the dispersal range is likely to be limited to only several hundred meters (<300 m) a day because of a limited period (30 min–1 h/day) of male mating activity in nature.

Takehiko Yamanaka, Sadahiro Tatsuki, and Masakazu Shimada "Flight Characteristics and Dispersal Patterns of Fall Webworm (Lepidoptera: Arctiidae) Males," Environmental Entomology 30(6), 1150-1157, (1 December 2001).
Received: 16 October 2000; Accepted: 1 July 2001; Published: 1 December 2001

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field dispersal
flight characteristics
Hyphantria cunea
mating activity of males
sex pheromone
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