Effect of Bt-cotton on chrysopids, ladybird beetles and their prey: aphids and whiteflies.
Indian J Exp Biol
;
2007 Jun; 45(6): 554-62
Article
Dans Anglais
| IMSEAR
| ID: sea-57923
ABSTRACT
The effect of Bt-cotton, i.e. genetically modified cotton that contain genes expressing delta-endotoxin, on aphid, whitefly, chrysopid and coccinellid populations was determined with a two-year field study at a cotton farm near Marble Hall, South Africa. Although Bt-cotton is lepidopteran specific, non-lepidopteran arthropod populations may be indirectly influenced by the endotoxin. Abundance of aphid, whitefly, chrysopid and coccinellid populations and predator-prey interactions were used as measures to determine possible effects on the populations under investigation. The cultivation of Bt-cotton had no effect on aphid, whitefly, chrysopid or coccinellid abundance. Positive density dependent interactions occurred between aphids and coccinellids which were not influenced by Bt-cotton. A significant relationship between whitefly and coccinellid abundance, i.e. predator-prey reaction, occurred in the control and sprayed non-Bt cotton fields but was absent from the Bt-cotton fields.
Texte intégral:
Disponible
Indice:
IMSEAR (Asie du Sud-Est)
Sujet Principal:
Aphides
/
Coléoptères
/
Densité de population
/
Végétaux génétiquement modifiés
/
Écosystème
/
Gossypium
/
Chaine alimentaire
/
Diptera
/
Endosulfan
/
Hemiptera
langue:
Anglais
Texte intégral:
Indian J Exp Biol
Année:
2007
Type:
Article
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