Student Profile: Eliott Smith
For decades, the western corn rootworm has been one of agriculture’s most notorious pests; so destructive it’s often called the “billion-dollar bug.” While Bt corn once offered farmers an effective defense against rootworms, these populations are now evolving resistance. At Iowa State University, Ph.D. candidate Eliott Smith is on the front lines of this battle. By combining detailed studies of the insect’s life cycle with cutting-edge genomic analysis, Smith is uncovering the biological and genetic secrets behind resistance, knowledge that could shape the future of sustainable pest management.
Bt corn has been an important tool for reducing farmers’ reliance on conventional synthetic insecticides, but over time, rootworm populations have adapted. Smith’s research focuses on phenotypic life-history traits, such as inheritance patterns and fitness costs, that influence the rate of resistance evolution. He pairs this biological data with cutting-edge genomic tools, using genome sequencing and quantitative trait loci (QTL) analysis to identify genetic regions associated with resistance.
“We are investigating phenotypic life history characteristics and the genetics of resistance, so that we can provide data that can be used to estimate the rate of Bt resistance evolution,” Smith said. “We hope the data from this project can be used to inform strategies used to delay the evolution of resistance to Bt corn.
Refuges, fields of non-Bt corn planted near Bt fields, are one of the main strategies used to maintain a susceptible insect population. By studying how resistance is inherited and the biological costs that resistant insects may face compared to susceptible insects when Bt is not present, Smith’s work helps strengthen this critical management tool. Smith was drawn to this project for more than just its agricultural importance.
“I was also excited about the opportunity to fill a knowledge gap and identify genetic regions associated with Bt resistance in western corn rootworm,“ he says. This work, although still in its early stages, could pave the way for the development of genetic markers that enable earlier detection of resistance in the field.
“It has been very rewarding to see how our research fits into the current landscape of published work and how our work supports and advances our understand of Bt resistance in the western corn rootworm,” said Smith.
Smith’s research is designed to have a ripple effect beyond the laboratory. His findings will directly benefit policy makers, seed companies, and fellow researchers by providing the biological parameters and genetic leads needed to improve predictive models and refine monitoring programs. In the long term, this could lead to better early-warning systems for farmers and more sustainable pest control strategies.
With the future of sustainable agriculture relying on data-driven decisions, Smith’s work may contribute to the biological and genetic building blocks needed for others to create those tools.
Smith envisions his research career continuing along this trajectory, focusing on the evolutionary dynamics of pest resistance and the genetic basis of adaptation
“My overall goal is to continue working on agricultural challenges and help farmers address real-world problems so we can sustainably feed a growing population,” he said. “I’m open to opportunities in any sector, whether that be academia, industry, or government, as long as I’m making a meaningful contribution to agriculture and society.”
If given the chance to extend his work into the next decade, Smith hopes to see his foundational data evolve into practical applications, including validated genetic markers for resistance monitoring, life-history parameters integrated into national resistance-management models, and early-warning systems that farmers can use to adapt before resistance becomes widespread.
Smith credits his success in part to the PPEM department, which merged entomology, plant pathology, and microbiology during his time at Iowa State.
“It's been exciting to see cross-disciplinary collaboration grow, especially with the integration of plant pathology, entomology and microbiology,” Smith commented. “Crops don’t face pests or diseases in isolation, so this merged department is well-positioned to tackle the complex challenges facing Iowa farmers.”
Mentorship, collaboration with peers, and conference experiences have also shaped his approach to science, reinforcing the importance of interdisciplinary work.