The bacterium Bacillus thuringiensis has great prominence in agriculture, since this behaves as an efficient agent to control insect pests. Due to the different expression proteins with insecticidal activity as Cry proteins, Cyt, chitinase and and more recently proteins second generation know as Vip. The combination of cry and vip genes being expressed simultaneously by means of genetic engineering can enhance the insecticidal activity, delay or prevent the emergence of target pest populations resistant to the action of proteins when used alone. Thus, this work aims to study the toxicity and mode of action of Cry1A proteins, and Cry2Aa Cry2Ab strain T01326 and Vip3Aa50 isolate I131 against neonate larvae of S. frugiperda and A. gemmatalis. It is expected, from the results obtained from the various analyzes of the mode of action of these proteins, which indicate the best combinations that could be used in pyramiding of transgenic plants for the control of these insect pests as well as the handling of the possible emergence of resistance these insects.
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