Identification and field testing of additional components of female sex pheromone of African armyworm,Spodoptera exempta (Lepidoptera: Noctuidae) |
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Authors: | A Cork J Murlis T Megenasa |
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Affiliation: | (1) Overseas Development Natural Resources Institute, Central Avenue, Chatham Maritime, ME4 4TB Chatham, Kent, UK;(2) Department of the Environment, Romney House, 43 Marsham Street, SW1P 3PY London, UK;(3) Desert Locust Control Organisation for East Africa, P.O. Box 30023, Nairobi, Kenya |
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Abstract: | Ovipositor washings from virgin femaleSpodoptera exempta (Walker) (Lepidoptera: Noctuidae) were analyzed by high-resolution gas chromatography (GC) linked to a male electroantennogram (EAG). GC retention times of the two major EAG responses observed were consistent with their assignment as (Z)-9-tetradecenyl acetate and (Z,E)-9,12-tetradecadienyl acetate, as previously identified. However, three other EAG responses were also noted that had GC retention times consistent with (Z)-9-tetradecenal, (Z)-9-tetradecen-1-o 1, and (Z)-11-hexadecenyl acetate. The components were present in the ratio of 10051.53.54, respectively. Further analysis of the ovipositor washings by GC linked to a mass spectrometer (GC-MS) confirmed these findings and indicated the presence of a sixth component consistent with (Z)-11-tetradecenyl acetate present at 2 % of the major component. In field tests carried out in Kenya, (Z)-11-hexadecenyl acetate was the only newly identified component to enhance the catch of the original two-component mixture when presented in their natural ratio. The addition of (Z)-9-tetradecen-1-ol reduced catch, while (Z)-9-tetradecenal and (Z)-11-tetradecenyl acetate had no apparent effect. |
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Keywords: | Spodoptera exempta Lepidoptera Noctuidae sex pheromone (Z)-9-tetradecenal (Z)-9-tetradecenyl acetate (Z)-11-tetradecenyl acetate (Z E)-9 12-tetradecadienyl acetate (Z)-9-tetradecen-1-ol (Z)-11-hexadecenyl acetate |
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