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 · 60 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 Sep 10, 2026.
60 recent developments
USDA APHIS expanded the ALB quarantine in Charleston County, adding 16.5 sq miles in Mount Pleasant and 25.2 sq miles in Hollywood, effective September 4, 2026, following confirmed infested trees found in both areas.
Clemson University updated Asian longhorned beetle quarantine boundaries effective August 23, 2026, expanding the Hollywood area quarantine and reducing the Mount Pleasant area following six years of eradication work. Survey crews have inspected over 596,000 trees and found 13,140 infested trees.
MDARD confirmed a spotted lanternfly population in Berrien County, a major grape-producing region, and a newly confirmed population in Washtenaw County as of September 10, 2026. Confirmed counties now include Berrien, Jackson, Lenawee, Macomb, Monroe, Oakland, Washtenaw and Wayne.
Emerald ash borer was found in an ash tree near Minnesota Avenue and 4th Street in Hayward, making it the seventh municipality in Sawyer County with a confirmed infestation.
EAB was found in Bismarck in late August 2026 during ash tree removals, the first detection in central North Dakota. Burleigh County is now under quarantine restricting movement of hardwood firewood and ash material.
Box tree moth was first confirmed in New Jersey on June 10, 2026 in Cape May County and later in Cumberland County. By Aug 27, 2026 a quarantine covering Cape May, Cumberland, and Atlantic counties was in place, with all life stages active in southern New Jersey.
About 8,000 parasitoid wasps were released at Ki-Chi-Saga Park in Chisago County on August 26, 2026 as biological control against EAB. Emerald ash borer is now confirmed in 60 Minnesota counties.
Maryland expanded its box tree moth quarantine effective Aug 24, 2026 to Caroline, Cecil, Kent, and Queen Anne's counties, bringing the total to eight Maryland counties under quarantine after confirmed infestations.
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.
Oklahoma Forestry Services reported emerald ash borer in Atoka County, adding to infestations in seven other Oklahoma counties. Officials issued warnings and published an updated EAB map on August 23, 2026.
Rhode Island DEM reported on August 20, 2026 that spotted lanternfly is established statewide, with over 1,000 reports in July and over 1,500 in August, indicating rapidly increasing populations across the state.
Texas A&M Forest Service confirmed emerald ash borer in Delta, Erath, Hardin, Walker, and Wood counties on August 20, 2026, bringing new-county detections in Texas to eight for 2026.
Washington state confirmed emerald ash borer in Vancouver after a specimen was identified in early August 2026. A statewide firewood quarantine was initiated the week of August 19 to contain the outbreak.
New Jersey Department of Agriculture reported renewed summer spotted lanternfly infestations across parts of New Jersey as of August 12, 2026. Adults are feeding on sap from over 70 plant species and laying egg masses that fuel recurring outbreaks.
Nebraska's July 2026 forest health report, released August 12, confirmed emerald ash borer in 20 counties, with new counties being added each year as the pest spreads through urban and rural tree populations.
Maine DACF reported in an August 11, 2026 bulletin that EAB was found in Bristol, Lincoln County marking the first detection there, and in Jackman, Somerset County, well outside the existing quarantine area. The state indicated the quarantine will be expanded.
By late July 2026, spotted lanternfly infestations in Hampshire County, Massachusetts grew from 3 communities in August 2025 to 10 cities and towns, with confirmed spread into Sunderland in Franklin County.
Larvae found in a dying ash tree in northeast Colorado Springs were confirmed as EAB on Aug 6, 2026, marking the first detection south of Parker and Highlands Ranch in Colorado.
Oregon Department of Forestry confirmed emerald ash borer in Salem, Beaverton, Bethany Lake Park in Rockcreek, and the Oregon Garden in Silverton in July 2026, announced August 6, 2026. The beetle is now known from five Willamette Valley counties.
NY DEC and NY Agriculture and Markets established a laurel wilt quarantine district in Suffolk County covering Huntington, Babylon, Smithtown, Islip, and Brookhaven, announced August 4, 2026. The invasive fungal disease had been confirmed in all five towns.
Allegheny County recorded 104 citizen spotted lanternfly reports from January through June 2026, the highest of any Pennsylvania county. The pest is now confirmed in 56 of Pennsylvania's 67 counties.
USDA APHIS confirmed box tree moth at private residences in Cape May County, New Jersey, prompting a local quarantine order with movement restrictions on boxwood plants.
Since early 2026, emerald ash borer has been confirmed in 16 new Maine municipalities including Bangor (Penobscot County) and Wilton (Franklin County). These represent significant municipal-level range expansions across the state.
As of July 28, 2026, confirmed spotted lanternfly infestations were reported across Columbia, Dutchess, Greene, Orange, Putnam, Rockland, Sullivan, Ulster, and Westchester Counties in New York's Hudson Valley.
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.
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.
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 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.
New York DEC and Agriculture and Markets announced a laurel wilt quarantine district covering Huntington, Babylon, Smithtown, Islip, and Brookhaven in Suffolk County following disease confirmation in August 2025. The quarantine restricts movement of sassafras, spicebush, and untreated firewood.
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.
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.
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.
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.
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.
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.
An ongoing southern pine beetle outbreak that began in 2023 continues in eastern Massachusetts, affecting pitch pine on Cape Cod, Martha's Vineyard, and Nantucket. The outbreak remains active as of mid-2026.
Cape May County was placed under a boxwood quarantine after box tree moths were confirmed at private residences in Rio Grande. Officials said the county would remain under quarantine for at least several years.
Luzerne, Lackawanna, Wyoming, Bradford, Sullivan, and Venango counties remain under spotted lanternfly quarantine. As of September 4, 2026, Pennsylvania had not added any new counties to the quarantine list in 2026.
UMass Extension documented Verticillium wilt on American elm in Massachusetts, confirmed by lab culture of symptomatic branches as of September 3, 2026. The report warns Verticillium can kill American elms, especially when combined with drought stress.
UMass Extension reported a significant outbreak of giant tar spot caused by Rhytisma acerinum on Norway maple in Massachusetts, with the disease causing premature leaf shedding especially in shaded trees. The report was published September 3, 2026.
Ohio Department of Agriculture and USDA released roughly 4,000 acres in Tate Township, Clermont County from the ALB quarantine on August 23, 2026. About 37.8 square miles in the county remain under quarantine.
Ohio extended a statewide spotted lanternfly quarantine in February 2026, restricting movement of trees and nursery stock. Franklin County has been under quarantine since 2023 and continues to report active infestations.
Minnesota DNR reported on August 10, 2026 that forest tent caterpillars damaged about 60,000 acres of trees in Aitkin County and surrounding counties, up from 41,200 acres in 2025. A larger outbreak in 2027 is being monitored.
Michigan Invasive Species Program and USDA APHIS issued a statewide alert on August 10, 2026 urging residents to check trees for Asian longhorned beetle signs including round exit holes and bark scars. August is designated Tree Check Month for heightened surveillance.
Spruce budworm caused severe defoliation in northeastern Oneida County and southeastern Vilas County as of Aug 5, 2026, with budworms expanding onto hemlock and tamarack near Sugar Camp, Oneida County.
Effective August 4, 2026, USDA APHIS added Ashtabula, Clark, Cuyahoga, Lake, Lorain, Lucas, and Preble Counties, Ohio to the federal box tree moth quarantined area following confirmed detections in 2025.
USDA APHIS removed 7.4 square miles from the Asian longhorned beetle quarantine in Nassau and Suffolk Counties, New York on July 30, 2026, following completed host-tree surveys and eradication activities. Portions of the quarantine in both counties remain in effect and eradication continues.
Environmental experts reported on July 24, 2026 that spotted lanternfly populations are increasing across Connecticut, with Fairfield County first affected in 2020 and the insect now spreading more widely.
The City of Arlington announced a confirmed oak wilt case in Arlington, Tarrant County in July 2026. Officials are advising residents on management practices and restrictions on pruning and wood movement to prevent spread.
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.
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.
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.
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.
Wisconsin forestry officials reported in early August 2026 that aspen leaf beetles were causing light to moderate defoliation of young quaking aspens in Vilas and Oneida counties, with scattered young white pines also experiencing significant defoliation.
UMass Extension reported a minor fire blight outbreak in a Massachusetts orchard in its June 26, 2026 landscape message, with apple and peach trees affected. No specific city or county was named.
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.