International Journal of Tropical Insect Science (2018) 38, 362-372

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Olufunmilayo E. Ajayi, Tolulope O. Morawo and Henry Y. Fadamiro (2018)
Preference of flight morph of Callosobruchus maculatus (Coleoptera: Chrysomelidae) for three plant legumes
International Journal of Tropical Insect Science 38 (4), 362-372
Abstract: We studied host discrimination in flight morph of Callosobruchus maculatus (F.) among the legume plants Ife-brown (IB) and black-eyed (BE) cowpea, Vigna unguiculata (L. Walp), soybean (SB), and Glycine max (L.) and analysed legume volatiles towards developing an attractant for C. maculatus. Olfactometry studies were conducted to investigate attraction of mated 3–4-day-old female C. maculatus to legume plants with the green pod (PGP), green pods (GP), plant with the ripened pod (PRP), ripened pod (RP), and plant without pod (PWP). We also assessed the response of beetles to phenological stages of the most attractive legume. In Y-tube bioassays, C. maculatus showed greater attraction to individual legumes at three phenological stages: PGP (73–93%), PRP (80–100%), and RP (63–93%) compared with PWP (6–36%). In four-choice bioassays, C. maculatus preferred IB at all stages to other legumes. SB had an insignificant attraction on the beetle. The RP of IB was the most attractive part of the plant. Gas chromatography (GC) and GC–mass spectrometry (GC–MS) analyses of volatiles emitted by RP of the legumes revealed a variation in the compositions of odour blends. Benzaldehyde was found in the volatiles of IB and BE with a higher emission in IB. Octanone was detected only in IB. The two compounds were undetected in SB volatiles. These results reveal that in addition to infesting cowpea plants at RP stage as reported in previous studies, C. maculatus could also infest cowpea plants at the GP stage.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Tolulope Morawo, Henry Y. Fadamiro

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Callosobruchus maculatus Cowpea and relatives (Vigna)
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