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Indian J Exp Biol ; 2007 Jun; 45(6): 554-62
Article in English | 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.


Subject(s)
Animals , Aphids/drug effects , Coleoptera/drug effects , Diptera/drug effects , Ecosystem , Endosulfan/pharmacology , Food Chain , Gossypium/genetics , Hemiptera/drug effects , Insecticides/pharmacology , Plants, Genetically Modified/physiology , Population Density
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