A nursery location with standing water, an ideal location to sample for Phytophthora. Credit: Robert Blanchette.
Background
Invasive plant pathogens pose a growing threat to Minnesota’s forests, wetlands, and urban landscapes. Among these, Phytophthora species are especially concerning because they can infect a wide range of trees and plants, causing disease outbreaks that damage ecosystems, harm wildlife habitats, and result in significant economic losses.
Recent surveys have found 17 previously undetected Phytophthora species in Minnesota. These species have arrived through pathways including nursery plants. Imported seeds, wood products, and online plant sales are other possible pathways of introduction that have yet to be fully studied. These invasive pathogens can remain hidden for years before causing noticeable damage, which makes early detection and monitoring critically essential to protect Minnesota’s environment and industries.
Research questions
- What plant pathogen species coming into Minnesota are the most dangerous, and where are they coming from?
- What pathways—nurseries, forests, waterways, imported materials—are high-risk?
- What host species are susceptible to Phytophthora and what is the severity of the disease?
- Can the newly detected pathogens infect native and economically important trees and shrubs?
Practical implications
The goal of this research is to provide early warning and inform management actions so that invasive pathogens can be controlled before they become widespread. The results will benefit not only land managers and nursery operators but also communities, homeowners, and industries that depend on healthy forests and urban landscapes.
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.
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