maize synthesises its own pesticide: a toxic protein produced in its leaves and stems, which kills pests in a matter of days. Except when insect populations develop resistance to the toxin!
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However, sooner or later, insect species may be able to develop a mechanism of resistance against any pesticides.
maize is not fundamentally different in this regard and in order to delay the evolution of resistance in pest populations, the concept of maintaining refuges for Bt susceptible moths was developed.
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This result recently published in the journal maize produce this toxin which destroys the gut of any moth larvae eating the plant.
The technique is effective and unlike wide spectrum pesticides, it only targets larvae of moths.
Unlike everything known so far, this resistance evolved in the field was inherited as a dominant trait.
This result shows for the first time that resistance to maize can be inherited in a dominant rather than recessive way.
Notwithstanding the success of these strategies, IRD scientists and their South African partners have now revealed that a major pest of maize, the moth toxin in South Africa.