Excessive use of transgenic corn induces resistance in "Diabrotica" spp

Analysis of 12 years of data from 10 states in the US Corn Belt indicates that farmers are facing economic losses due to the overuse of genetically modified corn to combat species of the genus Diabrotica.

The research, led by entomologist Christian Krupke of Purdue University, indicates that the pest has intensified in the western states of the region, where continuous planting of the grain is more common.

The research analyzed the evolution of the pest scenario since 2004, the year of the large-scale introduction of transgenic corn resistant to Diabrotica spp. The study shows that, initially, the use of technology reduced the pest infestation.

However, continued and indiscriminate use has led to the development of resistance to Bt corn, reducing its effectiveness. Since 2009, several field studies have reported cases of resistance in Diabrotica spp. to Bt toxins.

According to Krupke, the problem lies in the uniform adoption of Bt corn, even where the pest does not pose a significant threat.

The research also highlights that producers choose seeds with high yield potential, which often come with multiple built-in traits, including pest resistance, even when they are not needed.

The researchers emphasize that increasing pest resistance poses a collective risk.

More information can be found at doi.org/10.1126/science.adm7634