Carbon dioxide (CO₂) levels have increased 20 percent in the last century. By 2050, the atmosphere may contain 50 percent more CO₂ than in 1900. Elevated CO₂ in the atmosphere has environmental impacts including global warming and increased photosynthetic efficiency. Pollutant ozone (O₃) levels also are increasing rapidly in agricultural areas of industrialized regions. Ozone pollution currently has a negative impact on crop production and costs will continue to rise as O₃ increases in the atmosphere. To better understand the impact of increased levels of CO₂ and O₃ on crop production in the Midwest, an 80 acre experimental plot utilizes Free Air Gas Concentration Enrichment (FACE) to simulate the atmospheric composition in 2050. In addition to evaluating the impact of increased levels of CO₂ and O₃ on plant development, the experiment will study the impact on ovipositional behavior and adult densities of the variant western corn rootworm, Diabrotica virgifera virgifera LeConte in soybean. In 2003 and 2004, the study was conducted using four treatments (ambient control, elevated O₃, elevated CO₂, and elevated CO₂ and O₃). Adult densities were monitored throughout the growing season in each of the four treatments using three vial traps per treatment. Soil samples were collected at the end of each season from each treatment to determine if elevated atmospheric conditions have an impact on ovipositional behavior based on egg counts. Our preliminary results indicate that elevated levels of CO₂, O₃, and CO₂ and O₃ have an impact on adult densities and ovipositional behavior.