Belmain, Steven R. ORCID: 0000-0002-5590-7545 , Amoah, Barbara A., Nyirenda, Stephen P., Kamanula, John F. and Stevenson, Philip C. ORCID: 0000-0002-0736-3619 (2012) Highly variable insect control efficacy of Tephrosia vogelii chemotypes. Journal of Agricultural and Food Chemistry, 60 (40). pp. 10055-10063. ISSN 0021-8561 (Print), 1520-5118 (Online) (doi:https://doi.org/10.1021/jf3032217)

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Abstract

Tephrosia vogelii has been used for generations as a pest control material in Africa. Recently, two chemotypes have
been reported based on the occurrence (chemotype 1) or absence (chemotype 2) of rotenoids. This could have an impact on the efficacy and reliability of this material for pest control. We report that chemotype 2 has no pesticidal activity against Callosobruchus maculatus Fabricius (family Chrysomelidae) and that this is associated with the absence of rotenoids. We present a first report of the comparative biological activity of deguelin, tephrosin, α-toxicarol, and sarcolobine and show that not all rotenoids are equally effective. Tephrosin was less toxic than deguelin which was less active than rotenone, while obovatin 5-methyl ether, the major flavonoid in chemotype 2 was inactive. We also report that in chemotype 1 the occurrence of rotenoids shows substantial seasonal variation.

Item Type:	Article
Additional Information:	[1] Publication Date (Web): September 13, 2012. [2] Published in print: October 10, 2012. [3] Published as: Journal of Agricultural and Food Chemistry, (2012), Vol. 60 (40), pp. 10055–10063.
Uncontrolled Keywords:	Tephrosia candida, Callosobruchus maculatus, flavanones, rotenoids, deguelin, pesticidal plants, bruchids, cowpea weevil
Subjects:	S Agriculture > S Agriculture (General) S Agriculture > SF Animal culture
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science > Natural Resources Institute Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department Faculty of Engineering & Science > Natural Resources Institute > Chemical Ecology Research Group Faculty of Engineering & Science > Natural Resources Institute > Pest Behaviour Research Group
Related URLs:	Publisher Organisation Organisation
Last Modified:	11 Sep 2014 11:12
URI:	http://gala.gre.ac.uk/id/eprint/8941

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