Cry1F Resistance in Fall Armyworm (Spodoptera frugiperda)
By Ana María Vélez, Ph.D.
Professor of Entomology
University of Nebraska-Lincoln
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The fall armyworm, Spodoptera frugiperda, is an important pest of corn in southern U.S. and South America. The first corn hybrid that demonstrated satisfactory S. frugiperda control expressed the Cry1F protein. However, in 2006 field resistance to Cry1F corn hybrids was reported in Puerto Rico and lead to the first case of withdrawal of a Bt the product from the market in Puerto Rico. In addition to Puerto Rico, Cry1F resistance has been reported in Brazil and in some field in Florida and North Carolina. This presentation provides an overview of the current knowledge on fall armyworm Cry1F resistance and how this information will aid to refine resistance management strategies.