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Behavioural and electrophysiological response of sorghum chafer Pachnoda interrupta (Coleoptera: Scarabaeidae) to plant compounds

Published online by Cambridge University Press:  01 June 2007

Yitbarek Wolde-Hawariat*
Affiliation:
Department of Biology, Addis Ababa University, PO Box 1176, Addis Ababa, Ethiopia Department of Plant Protection Biology, Swedish University of Agricultural Sciences, PO Box 44, 230 53 Alnarp, Sweden
Emiru Seyoum
Affiliation:
Department of Biology, Addis Ababa University, PO Box 1176, Addis Ababa, Ethiopia
Bekele Jembere
Affiliation:
Department of Biology, Addis Ababa University, PO Box 1176, Addis Ababa, Ethiopia
Merid Negash
Affiliation:
Department of Biology, Addis Ababa University, PO Box 1176, Addis Ababa, Ethiopia
Bill S. Hansson
Affiliation:
Department of Plant Protection Biology, Swedish University of Agricultural Sciences, PO Box 44, 230 53 Alnarp, Sweden Department of Evolutionary Neuroethology, Max Planck Institute for Chemical Ecology, Hans-Knoell-Strasse 8, 0774 Jena, Germany
Ylva Hillbur
Affiliation:
Department of Plant Protection Biology, Swedish University of Agricultural Sciences, PO Box 44, 230 53 Alnarp, Sweden
*
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Abstract

Behavioural and antennal responses of the sorghum chafer Pachnoda interrupta (Olivier) were tested to the synthetic compounds, such as eugenol, methyl salicylate, methyl anthranilate, isoamyl acetate and butyl butyrate. In the field, all odour-baited traps, except isoamyl acetate applied on cotton dispensers, were significantly more attractive than blank (unbaited) traps and all compounds, except isoamyl acetate, elicited dose-dependent responses in both male and female antennae. Dispenser type (cotton wick or rubber septum), trap location (inside or outside sorghum fields) and season (mating/July or feeding/September) affected the performance of the different compounds as lures. In July, methyl salicylate applied on cotton was the most attractive lure, whereas the most attractive treatments in September were eugenol and isoamyl acetate on rubber septa. Possibly due to odour and visual competition from the sorghum plants, traps placed outside the sorghum fields caught significantly more beetles than traps placed inside the fields. The trapping efficiency of a locally produced trap was found not to be competitive with that of the commercially available Japanese beetle trap. Overall, the results suggest that trapping with semiochemicals has a potential in sorghum chafer management, either for mass trapping and/or as part of an integrated pest management programme.

Type
Research Paper
Copyright
Copyright © ICIPE 2007

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