Highly variable insect control efficacy of Tephrosia vogelii chemotypes.
J Agric Food Chem
; 60(40): 10055-63, 2012 Oct 10.
Article
em En
| MEDLINE
| ID: mdl-22970736
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.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Controle de Insetos
/
Tephrosia
/
Inseticidas
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article