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1 April 2005 Effect of Aging on Pheromone Emission from a Commercial Beet Armyworm (Lepidoptera: Noctuidae) Lure and Trap Efficiency
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The effect of aging on a commercial pheromone-based lure for attractiveness to male adult beet armyworms, Spodoptera exigua (Hübner), was assessed in terms of trapping efficiency and volatile emissions of two key components: (Z,E)-9,12-tetradecadienyl acetate and (Z)-9-tetradecen-1-ol. In field assays conducted in the Lower Rio Grande Valley, Texas, for 9 wk (June–August 2000) and for 8 wk (March–May) in Tamaulipas, Mexico, 0–1-wk-old lures collected greater than four-fold more male beet armyworm adults than lures that had been aged for 3–4 wk. Using solid phase microextraction and gas chromatographic analysis of the volatiles, mean (Z,E)-9,12-tetradecadienyl acetate emission declined by 32% after 5 wk of aging in a ventilated environmental chamber at 29.4°C, 35% RH, to simulate subtropical summers. Mean (Z)-9-tetradecen-1-ol emission was reduced by 62% after 4 wk of aging. Under the tropical and subtropical conditions of this study, the capacity of the lure to attract moths into the trap declined after aging for 3 wk. The blend ratio (Z,E)-9,12-tetradecadienyl acetate:(Z)-9-tetradecen-1-ol declined 29% when the lure was aged for 5 wk. This study will assist in the development of a standard trapping system for assessing adult beet armyworm populations in the tropical and subtropical conditions to which the species is endemic.

A. T. Showler, E. Salgado, I. Fraser, and D. C. Robacker "Effect of Aging on Pheromone Emission from a Commercial Beet Armyworm (Lepidoptera: Noctuidae) Lure and Trap Efficiency," Journal of Economic Entomology 98(2), 373-377, (1 April 2005).
Received: 21 July 2004; Accepted: 1 December 2004; Published: 1 April 2005

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