Field-Resistance Of The African Maize

In 1997 South Africa became the first country in Africa to commercially produce genetically modified (GM) crops. Farmers started adopting Bt yellow maize (mainly used as animal feed) during the 1998/99 season. Bt white maize (mainly used for human consumption) was introduced during the 2001/02 season and the 2002/03 season saw the first large-scale Bt white maize production. Up to 2006, when event Bt11 was commercially released in South Africa all Bt maize hybrids contained event MON810. These hybrids therefore all have the same gene that encodes for the Cry1Ab protein that is selectively toxic to larvae of the Lepidoptera. Bt maize, expressing Cry1Ab protein, was initially developed for the control of two stem borer species in North America i.e., Ostrinia nubilalis (Lepidoptera: Crambidae) and Diatraea grandiosella (Lepidoptera: Crambidae). These products also effectively control moth larvae of other economically important pests in Africa, which include Chilo partellus and Sesamia calamistis (Van Rensburg, 1999; Van den Berg & Van Wyk, 2007). Until 2006, effective control of the main target pest of Bt maize, Busseola fusca, was also reported in South Africa. Since the first deployment of GM crops with insecticidal properties, there has been concern with regard to resistance development of target pests and possible non-target effects.


Title: Field-Resistance Of The African Maize
Authors: Johnnie van den Berg
Tags: insecticides
genetically modified
Date: 21-Jul-2013
Publisher: Third World Network
Category Type: Reports
Appears in Sub-Collections:Biodiversity


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