Old World bollworm. Credit: Gyorgy Csoka, Hungary Forest Research Institute, Bugwood.org, CC BY-NC 3.0 US, cropped for use.
Background
The Old World bollworm (OWB, Helicoverpa armigera) is one of the most destructive insect pests in the world, attacking important crops like corn, soybean, and cotton. While OWB has not yet become established on the US mainland, it has been repeatedly found at US ports, including near Chicago’s O’Hare International Airport, showing that the risk of invasion is high.
An even bigger concern is OWB’s ability to interbreed with the closely related native species, the corn earworm (CEW, Helicoverpa zea). The combination introduces advantageous traits such as insecticide resistance and cold tolerance into CEW populations. The widespread planting of corn and soybeans across the US could increase the chances of hybridization between OWB and CEW, promoting genetic introgression and producing adaptable hybrid pests.
In this project, researchers will assess the potential threats posed by the invasion of OWB, with a particular focus on the consequence of its hybridization with CEW.
Research questions
- What is the potential threat posed by the invasion of Old World bollworm?
- What are the consequences of Old World bollworm’s hybridization with corn earworm?
- How well can Old World bollworm and hybrids survive Minnesota’s winters?
- How well do the species develop and reproduce on sweet corn?
- Are hybrid populations more resistant to commonly used pest control tools?
Practical implications
By understanding the risks before OWB becomes established, Minnesota can take early action to reduce its impact. Researchers will share results with growers and stakeholders through active outreach and extension programs. Results will enhance invasive pest preparedness in Minnesota and beyond by providing science-based insights to guide surveillance, monitoring, and integrated management strategies.
Findings
This project began in January 2026 and is in progress for the next several years. Please check back at a later time for updates.
To stay connected, sign up for the MITPPC newsletter.