Researchers identify key factors in the spread of insect pests and find public surveillance is critical to early detection

The findings, which were published in the August, 2024, issue of Journal of Environmental Management, can be used to improve strategies for early detection and response to new insect pests.

The introduction of non-native species poses substantial ecological and economic threats globally and is a critical driver of environmental change. Early detection is widely seen as crucial to managing and reducing the impacts of emerging pests. However, the role of community members and homeowners in detecting new invasions has not been fully explored until this work.

"Our results highlight areas at highest risk for new pest introductions and where members of the public -- people like you and me -- have served particularly important roles in detecting new pests," said Rebecca Epanchin-Niell, an associate professor in the Department of Agricultural and Resource Economics at UMD and lead author of the study. "These findings can support the design of more cost-effective pest survey programs. For example, a better defensive strategy can be planned if you know where the risks are highest and which areas may already have some detection coverage."

Epanchin-Niell and her colleagues analyzed more than 100 recent pest introductions and data for 3,000 counties across the United States. They looked at the impacts of various factors such as human population density, proximity to ports, climate conditions, and agricultural activity, on the likelihood of pests becoming established and being detected.

Their results showed that the likelihood of pest establishment is greater in more populated areas and close to ports, reflecting entry points and pathways for pest introduction. Establishment also was associated with climate factors that affect survivability. The team then mapped the likelihood of introduction across the continental United States, visually representing areas at higher risk.

The research also revealed that pests are more likely to be detected by the public in high human population areas, as a higher number of individuals increases the chances of encountering and reporting pests. Public involvement in pest detection also was higher in regions where agriculture constitutes a smaller value in the local economy, where detection by farm operators, agricultural extension, and agency pest surveys may be less focused. In these areas, public involvement in pest detection becomes increasingly critical.