Njoroge, A W and Affognon, H D and Mutungi, C and Richter, U and Hensel, O and Rohde, B and Mankin, R W (2017) Bioacoustics of Acanthoscelides obtectus (Coleoptera: Chrysomelidae: Bruchinae) on Phaseolus vulgaris (Fabaceae). Florida Entomologist, 100 (1). pp. 109-115. ISSN 0015-4040
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Abstract
Acanthoscelides obtectus (Say) (Coleoptera: Chrysomelidae) is an economically important pest of common bean, Phaseolus vulgaris L. (Fabaceae), in the tropics and subtropics. The larvae are cryptic and spend most of their development time inside the bean seeds. Their presence is almost imperceptible except for circular emergence holes created by the last instar larvae in preparation for their exit as adults. We considered a hypothesis that readily available acoustic detection devices can be used to detect larvae and adults in stored beans. Laboratory experiments were conducted in an anechoic chamber to characterize the sounds of movement and feeding and estimate whether they could be distinguished from background noise in storage environments. The larvae produced low-amplitude insect sound impulses frequently occurring in trains (bursts) of 2 or more impulses (mean = 3.6). The adults produced lower-amplitude impulses, although at a higher rate than the larvae, and there were significantly fewer impulses per burst. These features of the acoustic signals were useful for real-time detection of A. obtectus infestation and discrimination from background noise in stored common beans in sub-Saharan Africa. The use of such technology in the future, especially if its costs can be reduced further, may contribute to efforts to alleviate hunger and poverty in the region.
| Item Type: | Article |
|---|---|
| Divisions: | Research Program : West & Central Africa |
| CRP: | CGIAR Research Program on Grain Legumes |
| Uncontrolled Keywords: | Acoustic detection; Grain storage; Sub-Saharan Africa; Common bean |
| Subjects: | Others > Food Security Others > African Agriculture Others > Africa Others > Legume Crops Others > Sub-Saharan Africa |
| Depositing User: | Mr Ramesh K |
| Date Deposited: | 18 Apr 2017 08:10 |
| Last Modified: | 06 Sep 2017 08:40 |
| URI: | http://oar.icrisat.org/id/eprint/9965 |
| Official URL: | http://dx.doi.org/10.1653/024.100.0116 |
| Projects: | UNSPECIFIED |
| Funders: | UNSPECIFIED |
| Acknowledgement: | We gratefully acknowledge the financial support for this research by the Deutsche Gesellschaft für Internationale Zusammenarbeit, GmbH (GIZ) under the Reduction of Postharvest Losses and Value Addition in East African Food Value Chains (RELOAD) project (project number 12.1433.7-001.00 contract number 81161243). A. W. N. was supported by a RELOAD project scholarship awarded by the International Centre for Insect Physiology and Ecology (icipe). B. B. R. was supported supported by a National Science Foundation Graduate Research Fellowship, DGE-1315138, and by a teaching assistantship from the University of Florida. Mention of a trademark or proprietary product is solely for the purpose of providing specific information and does not constitute a guarantee or warranty of the product by the United States Department of Agriculture and does not imply its approval to the exclusion of other products that may also be suitable. The United States Department of Agriculture is an equal opportunity employer. |
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