Effect of Aging on Pheromone Emission from a Commercial Beet Armyworm (Lepidoptera: Noctuidae) Lure and Trap Efficiency

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 assa...

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Bibliographic Details
Published in:Journal of economic entomology 2005-04, Vol.98 (2), p.373-377
Main Authors: Showler, A. T., Salgado, E., Fraser, I., Robacker, D. C.
Format: Article
Language:English
Subjects:
aging
Animals
beet armyworm
Biological and medical sciences
Control
FIELD AND FORAGE CROPS
Fundamental and applied biological sciences. Psychology
Generalities
Insect Control - methods
lure age
lure aging
lure longevity
Male
pest monitoring
pheromone
pheromone blends
pheromone traps
Pheromones - chemistry
Phytopathology. Animal pests. Plant and forest protection
Population Density
Protozoa. Invertebrates
sex attractants
Spodoptera - physiology
Spodoptera exigua
temporal variation
Time Factors
trapping
volatile compounds
volatile emissions
Volatilization
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Summary: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.
ISSN:0022-0493
1938-291X
DOI:10.1603/0022-0493-98.2.373