Journal
ANNALS OF APPLIED BIOLOGY
Volume 147, Issue 1, Pages 43-48Publisher
WILEY
DOI: 10.1111/j.1744-7348.2005.00006.x
Keywords
Acanthoscelides obtectus; biopesticide; Callosobruchus chinensis; Callosobruchus maculatus; extract; F-1 progeny production; mortality; oviposition; rotenoids; seed damage; Tephrosia vogelii
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Aliquots of powdered dried leaves of Tephrosia vogelii (Leguminosae - Papilionoideae) were extracted with hexane, acetone and ethanol. The extracts were tested for their potential to protect stored legume seeds from damage by the bruchids Acanthoscelides obtectus, Callosobruchus maculatus and Callosobruchus chinensis (Coleoptera - Bruchidae). While the acetone and ethanol extracts were ineffective except for a significant but low effect on A. obtectus, the hexane extract had a relatively high efficacy, providing similar control of all three bruchid species. This effect was manifested in slowly-reduced adult survival within 7 days and in reduced numbers of eggs laid and of F, progeny produced, resulting in seed damage averaging 7.1% compared to 99.8% in the untreated controls after one generation. These findings are discussed in the context of previously identified constituents of T. vogelii, the rotenoids rotenone, tephrosin and deguelin.
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