TY - JOUR
T1 - Efficacy of plant extracts against the cowpea beetle, Callosobruchus maculatus
AU - Boeke, S.J.
AU - Barnaud, B.
AU - van Loon, J.J.A.
AU - Kossou, D.K.
AU - van Huis, A.
AU - Dicke, M.
N1 - 2570
PY - 2004
Y1 - 2004
N2 - Traditionally used African plant powders, with a known effect against the cowpea beetle Callosobruchus maculatus in stored cowpea, were extracted with water. The extracts, 13 volatile oils, 2 non-volatile oils and 8 slurries, were evaluated for their toxic and repellent effects against the beetle. Application of volatile oils led in most cases to a reduced number of eggs on treated beans. The volatile oils of Cymbopogon nardus and C. schoenanthus caused the majority of the eggs not to develop into adult beetles. Repellent effects were found for Clausena anisata, Cymbopogon citratus, Cymbopogon nardus, a mixture of Cymbopogon citratus and Cymbopogon flexuosus, Hyptis spicigera, Tagetes minuta and for two samples of Ocimum basilicum. Non-volatile oils were not repellent and had no effect on the number of eggs laid, but the development of these eggs was hampered, most so by Azadirachta indica oil. None of the slurries had a toxic effect on the beetles, but the slurries obtained from Carica papaya, Dracaena arborea and Tephrosia vogelii were repellent, whereas the slurry from Azadirachta indica leaves was attractive. Oils, both volatile and non-volatile, were easily extracted from plant material and showed promising results as a protective agent for stored cowpea.
AB - Traditionally used African plant powders, with a known effect against the cowpea beetle Callosobruchus maculatus in stored cowpea, were extracted with water. The extracts, 13 volatile oils, 2 non-volatile oils and 8 slurries, were evaluated for their toxic and repellent effects against the beetle. Application of volatile oils led in most cases to a reduced number of eggs on treated beans. The volatile oils of Cymbopogon nardus and C. schoenanthus caused the majority of the eggs not to develop into adult beetles. Repellent effects were found for Clausena anisata, Cymbopogon citratus, Cymbopogon nardus, a mixture of Cymbopogon citratus and Cymbopogon flexuosus, Hyptis spicigera, Tagetes minuta and for two samples of Ocimum basilicum. Non-volatile oils were not repellent and had no effect on the number of eggs laid, but the development of these eggs was hampered, most so by Azadirachta indica oil. None of the slurries had a toxic effect on the beetles, but the slurries obtained from Carica papaya, Dracaena arborea and Tephrosia vogelii were repellent, whereas the slurry from Azadirachta indica leaves was attractive. Oils, both volatile and non-volatile, were easily extracted from plant material and showed promising results as a protective agent for stored cowpea.
KW - piper-guineense
KW - stored cowpea
KW - protectants
KW - products
KW - oils
U2 - 10.1080/09670870410001702206
DO - 10.1080/09670870410001702206
M3 - Article
SN - 0967-0874
VL - 50
SP - 251
EP - 258
JO - International Journal of Pest Management
JF - International Journal of Pest Management
IS - 4
ER -