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Title: Effect of Bt-cotton on chrysopids, ladybird beetles and their prey: Aphids and whiteflies
Authors: Mellet, M A
Schoeman, A S
Keywords: Bacillus thuringiensis
Biological control
Predator-prey interactions
Transgenic cotton
Issue Date: Jun-2007
Publisher: CSIR
Abstract: The effect of Bt-cotton, i.e. genetically modified cotton that contain genes expressing -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.
Page(s): 554-562
ISSN: 0975-1009 (Online); 0019-5189 (Print)
Source:IJEB Vol.45(06) [June 2007]

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