Regional Pest Alert Map
Where the major pests and diseases pressuring trees are established across the lower 48, how severe each one is, and when it peaks. Live alerts drop on when new detections and quarantines hit the news. Every marker links straight to diagnosis and treatment.
66 hotspots across 22 pests & diseases · 35 live alerts
Hotspots are the established range centroids from the Pest & Disease library. Hover or tap a marker for detail, click through for treatment. Live alerts current as of Aug 23, 2026.
35 recent developments
Clemson University announced quarantine boundary revisions in Charleston and Dorchester counties effective August 23, 2026, expanding the Hollywood quarantine area and reducing the Mount Pleasant area based on survey results.
New York DEC confirmed oak wilt in a red oak in the town of Greece, Monroe County, in mid-June 2026. Officials removed the infected tree and are monitoring nearby oaks near English Road and Vintage Lane.
Michigan MDARD confirmed the state's first detection of elm zigzag sawfly in St. Clair County on July 21, 2026, identified from samples submitted by an arborist via the Midwest Invasive Species Information Network.
Minnesota Department of Agriculture announced aerial treatments for spongy moth infestations in Aitkin, Carlton, Pine, and St. Louis counties starting July 14, 2026, targeting confirmed outbreak sites in northern Minnesota forests.
Southern pine beetle outbreaks ongoing since 2023 are continuing in 2026 on Cape Cod, Martha's Vineyard, and Nantucket, targeting pitch pine. Officials urge reporting of suspected infestations amid continued bark beetle pressure.
On July 10, 2026, Michigan conservation leaders confirmed spotted lanternfly in Jackson County as well as Lenawee, Macomb, Monroe, Oakland, and Wayne counties, reflecting continued range expansion in southeastern Michigan.
On July 6, 2026, WCYB reported the first mass sighting of spotted lanternfly in Bristol, Sullivan County, Tennessee. Tennessee Department of Agriculture has officially detected SLF in six Tennessee counties so far in 2026.
On July 2, 2026, North Dakota Forest Service confirmed a second EAB detection in Cass County, north of Mapleton and more than 12 miles from the first find in Fargo, indicating local range expansion.
As of mid-2026, spotted lanternfly has been documented in 56 of Pennsylvania's 67 counties, showing continued spread across the state since the pest's first detection in Berks County in 2014.
On July 1, 2026, the first spotted lanternfly sighting in Marion County, Ohio was reported. Ohio is under a statewide SLF quarantine, and the insect continues to appear in new locations statewide.
Fairfax County reports that spotted lanternfly, first detected in western Fairfax County in 2022, is now found throughout the county. Officials state that sighting reports are no longer needed due to the established population.
Oregon officials confirmed EAB in three new locations within the existing multi-county quarantine zone: Newberg (Yamhill County), Tualatin (Washington County), and Silverton (Marion County). Two heavily infested ash trees and six with early signs were found in a Newberg parking lot.
MDARD confirmed spotted lanternfly populations across southeastern Michigan, including parts of Jackson County, expanding beyond earlier localized detections. More than 100 locations have been monitored since the first Michigan detection in 2022.
Fairfax County reports spotted lanternflies have proliferated across the D.C. region since arriving in Annandale in 2021. County experts describe the species as still in an exponential growth phase and urge residents to report and kill insects.
Ongoing southern pine beetle outbreaks that began in 2023 are continuing in eastern Massachusetts, with pitch pine as the primary host on Cape Cod, Martha's Vineyard, and Nantucket. Activity increases as temperatures warm and reporting of suspected infestations is urged.
Texas A&M Forest Service detected emerald ash borer adults in monitoring traps in three new Texas counties, announced June 5, 2026. The finds expand EAB's known range in the state.
Minnesota Department of Agriculture confirmed EAB in Willmar, outside the prior quarantine area, and enacted an emergency countywide quarantine on June 2, 2026. Movement of firewood and ash material out of Kandiyohi County is now restricted.
New Jersey confirmed box tree moth at residences in Rio Grande, Middle Township, Cape May County, in June 2026, placing the county under a boxwood quarantine restricting movement of plant material.
Napa County officials warned on May 26, 2026 that grapevines sold at a Napa Costco between April 21 and May 26 may carry glassy-winged sharpshooter. Of 220 vines from a Fresno County nursery, 157 were unaccounted for and potentially planted across Napa County.
The Maryland Secretary of Agriculture issued a quarantine order covering all 23 Maryland counties and Baltimore City. A March 2026 infestation ranking shows heavily infested areas in Baltimore City and central Maryland counties including Baltimore, Howard, and Prince George's.
In February 2026, the Ohio Department of Agriculture implemented a statewide quarantine for spotted lanternfly following its spread across multiple counties. Trap installation at parks in Beavercreek, Greene County was planned for July 2026.
NYS DEC maintains an oak wilt quarantine district in parts of Ontario County towns Bristol, South Bristol, and Naples, and Yates County towns Middlesex and Italy, based on confirmed infection centers identified in 2025, restricting oak material movement.
Texas A&M Forest Service confirmed emerald ash borer in Young, Montague, and Clay counties after adult beetles were captured in monitoring traps. These are new county records expanding EAB's known presence in north-central Texas.
Washington State Department of Agriculture proposed spongy moth eradication treatments west of Lake Youngs in King County and in the Lakewood area of Pierce County based on 2025 trapping data showing reproducing populations.
A June 26, 2026, UMass Extension update confirmed box tree moth in several Barnstable County communities and in Brookline, Norfolk County, prompting guidance for residents to report suspected finds.
A June 26, 2026 notice states spotted lanternfly nymphs are active throughout much of Maryland under an existing statewide quarantine. Residents are urged to destroy nymphs and report sightings to the Maryland Department of Agriculture.
Massachusetts MDAR recorded SLF egg hatch in Worcester County as of May 8, 2026 and nymphs active on cultivated grapes in Belchertown, Hampshire County as of June 3, 2026. Nymph abundance increased on tree-of-heaven at UMass Amherst through June 17, 2026.
Minnesota Department of Agriculture designated three treatment blocks totaling over 36,000 acres in Rochester, Olmsted County, with aerial spraying scheduled for June 24-26, 2026. The treatments aim to slow spread of spongy moth populations in the city.
A Cumberland County notice reports spotted lanternfly has spread to 56 Pennsylvania counties. The pest feeds on sap from over 70 plant species and continues to expand since its initial Berks County detection in 2014.
Jefferson County officials observed late-stage mountain pine beetle larvae and pupae in ponderosa and lodgepole pine, with adult flight estimated around mid-June 2026, two to four weeks ahead of schedule. Landowners are advised to deploy verbenone repellent and inspect trees.
An Oregon Department of Forestry specialist found a mature EAB adult in King City in early May 2026, the first detection in that community. King City is within the existing Washington County EAB quarantine zone established after Oregon's first find in 2022.
Massachusetts Department of Agricultural Resources reported spotted lanternfly egg hatch began in Worcester County as of May 8, 2026. SLF now has established populations in multiple Massachusetts communities.
A May 4, 2026 city alert for Coon Rapids, Minnesota, referenced an emergency quarantine in effect associated with invasive spongy moth, indicating a recent detection or elevated risk in Anoka County.
USDA APHIS and Wisconsin added Green County and Sawyer County to the spongy moth quarantine area effective May 1, 2026, expanding the regulatory footprint in the state.
On April 15, 2026, Wisconsin DATCP added Green County and Sawyer County to the state's spongy moth quarantine based on 2025 trapping data, restricting movement of firewood and nursery stock.
14 high-priority threats tracked
Every marker traces back to a full diagnostic entry.
Symptoms, range, peak season, severity and treatment options — cross-linked to the tree species each pest attacks. The library is the source this map reads from.