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The LEO Network is a worldwide network of observers and experts that share their observations of environmental change.
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Observations

Invasive emerald ash borer forces North Yarmouth to remove ash trees from park
North Yarmouth, Maine removed about 80 ash trees from Baston Park after an emerald ash borer infestation was detected. The wood will be processed by the Cumberland Wood Bank for local heating under state-advised precautions.
North Yarmouth, Cumberland County, Maine, United States
The Portland Press Herald

‘Mellanlummer’ discovered in Västernorrland – rare plant found by botanists
The rare clubmoss known in Swedish as “mellanlummer” has been recorded for the first time in Västernorrland, in forests near Viksjö. Botanists link the find to SCA’s prescribed burns that open and rejuvenate the forest.
Viksjö, Västernorrland, Sweden
SVT Nyheter

Fall’s Running Late This Year in Alaska
Autumn is marked by delayed leaf fall and reduced rainfall, with temperatures higher than historical averages, suggesting potential climate shifts.
Anchorage, Alaska, United States

Environmental disaster threatens the Amga due to loggers’ negligence
Public monitors in Aldansky District, Yakutia, found logging waste, hazardous trash, and unremoved timber left by LLC Vostochnoe near the Amga River, warning of heightened wildfire risk and potential environmental harm. They urge prosecutors and the republic’s ecology ministry to enforce cleanup and fire‑prevention measures before the lease expires in December.
Aldansky District, Sakha Republic, Russia
Yakutia.Info

Lasting impacts of Storm Vaia
Storm Vaia, a rare and catastrophic Mediterranean storm in October 2018, devastated Northern Italy's forests, felling approximately 15 million trees and causing over 1.7 billion euros in damages, with lingering impacts including increased vulnerability to wind events because of the loss of forest.
Moena, Trentino, Italy

Wildfires in E. C. Manning Provincial Park
In September 2025, multiple wildfires were observed near E.C. Manning Provincial Park, BC, highlighting the increasing prevalence and intensity of wildfires in the region.
E.C. Manning Provincial Park, British Columbia

Fast-spreading fungus deadly to endangered butternut trees attacking 3 areas of P.E.I.
Butternut canker, a fast‑spreading fungal disease with no known cure, has been detected in multiple locations on Prince Edward Island; Islanders are urged to take precautions to limit spread.
Charlottetown and Stratford, Prince Edward Island, Canada
CBC News
Delaney Kelly (with files from Jackie Sharkey)

Additional Forces to Fight Forest Fire in Western Chukotka
A 99-hectare wildfire 32 km from the village of Anyuysk in Bilibino District is being fought by 20 airborne firefighters, with nine more specialists en route by Mi-8 helicopter.
Anyuysk, Bilibino District, Chukotka Autonomous Okrug, Russia
prochukotku.ru

Forest fire area in Yakutia increases to 1,500 ha
The total area of active forest fires in the Sakha Republic (Yakutia) grew from 265 ha to 1,462.5 ha on July 22, with 10 fires being fought by 306 personnel and 14 units of equipment.
Republic of Sakha (Yakutia), Russia
Yakutia.Info

Multiple forest fires in the county
Lightning strikes from passing thunderclouds have ignited forest fires in several inland municipalities in Norrbotten County, Sweden, prompting rescue services to work to extinguish them.
Norrbotten County, Sweden
Norrbottens-Kuriren

A Total of 12 Wildfires Extinguished Nationwide
Over the past five days, Mongolia’s National Emergency Management Agency reports that 12 of 22 recorded forest and steppe wildfires across multiple aimags have been fully extinguished, with four fires still active.
Nationwide, Mongolia
MONTSAME News Agency

Shifting Dominance in Ponderosa Pine Forests
An environmental impact assessment near Okanagan Lake reveals an unexpected shift from Ponderosa Pine to Douglas Fir dominance, attributed to fire suppression and climate change, challenging traditional forest dynamics.
Kelowna, British Columbia, Canada

Wildfire in Fish Creek Community Forest
A wildfire erupted in Fish Creek Community Forest within Fort St. John, B.C., on May 1, 2025, fueled by warm, dry, and windy conditions amid severe drought, highlighting the increasing risk of human-caused wildfires in urban-adjacent forests due to climate change and industrial practices.
Fort St. John, British Columbia, Canada

Self-sustaining soil cavity hole
A small soil cavity in the UAF North Campus boreal forest remains open all winter, maintaining a steady temperature and emitting high CO2 levels, which is unusual for its self-sustaining nature and potential implications for permafrost research.
Fairbanks, Alaska, United States
Vladimir Romanovsky, Leanne Bulger, Anna Liljedahl , Alexander Kholodov

Dying Western Red Cedars
Western red cedars in South Langley, BC are dying, with browning starting at the tops during summer and progressing downward until the trees are completely dead.
Langley, British Columbia, British Columbia, Canada

Changing Wildfire Behaviour Results in Devastating Fires in the BC Interior
In 2023, British Columbia experienced its worst wildfire season, with the Bush Creek East fire spreading an unprecedented 20 km in 12 hours, leading to massive evacuations and significant destruction, highlighting the need for improved wildfire management and adaptation strategies.
North Shore of Shuswap Arm, Shuswap Lake, British Columbia, Canada

Douglas Fir and Ponderosa Pine Regeneration in a Changing Climate
Factors like reduced summer precipitation, extreme heat events, and ponderosa pine's superior drought resilience highlight the need to adapt reforestation practices to species more suited to changing environmental conditions.
Castlegar, British Columbia, Canada

Persistent drought
"In our country Afghanistan I have observed that the level of water is decreasing day by day."
Kabul, Kabul, Afghanistan

Blue sap on spruce tree
Blue sap was found on a spruce tree.
Koliganek, Alaska, United States
Lars Flora, Gino Graziano, Elizabeth Graham, Constantine Johnson, Robin Mulvey

Fallen Healthy Trees
There are at least 10 or more what appears to be otherwise healthy trees that have just fallen over.
Elim, Alaska, United States
Leigh Takak, Jessie Moan, Elizabeth Graham, Anahma Shannon

Here winter has become two months shorter
Winter will never be the way it was, according to scientists. Towards the end of the century, the Norwegian Meteorological Institute predicts that the winter weather will gradually disappear from Oslo.
Bodø, Nordland, Norway
NRK

Agriculture Officials Really Want Those Spotted Lanternflies Gone, Gone, Gone
Pennsylvania officials are giving the following advice to those who encounter the pesky invasive insects: "Kill it! Squash it, smash it ... just get rid of it."
Pennsylvania, United States
NPR.org

Caterpillars on Kesugi Ridge
Hikers on Kesugi Ridge observe a large abundance of Rusty Tussock Caterpillars all over cairns marking the trail from Coal Creek to Byre's Lake. They swarmed on the hiker's bodies and packs and from a distance covered structures to the point where they looked black.
Chase, Alaska, United States
Jessie Moan, Carl Roland, Kendra Wissel, Adrienne Fleek, Sarah Stehn

Double-crested Cormorant (Phalacrocorax auritus) Extended Range into the St. Lawrence Region
Double-crested cormorants have been observed in the St Lawrence River region, with record-breaking numbers, in recent years.
Gananoque, Ontario, Canada

Vancouver trees dry out as heat wave continues to take its toll
British Columbia's unprecedented heat wave and drought-like conditions may be what is causing some Vancouver trees to shed their leaves this week, a scientist says.
Vancouver, British Columbia, Canada
CBC

Lymantria dispar dispar outbreak
Lymantria dispar dispar also known as spongy moth was observed in Waterloo Ontario to be in unusually large quantities during the summer of 2021.
Waterloo, Ontario, Canada

Urban tree damage in Montreal
Trees in urban residential areas seem to be more prone to damage because of an increase in windstorms and because of maintenance work, which has weakened trees.
Saint-Léonard, Quebec, Canada

Irregular Ponderosa Pine Growth
Ponderosa pines in Eastern Washington are displaying signs of irregular growth.
Spokane, Washington, United States

Snow conditions causing stress on trees
The snowfall that came in the relatively mild Christmas season, was followed by severe cold and has caused the snow to freeze to bark and needles on conifers. The snow that now comes, settles on the branches in thick layers and is becoming heavier to carry.
Kattåsen, Finnemarka, Modum, Viken
NRK

Late Blooming Willow (genus Salix)
Wasilla, Alaska, United States

Extreme rain brings flurry of landslides
Large amounts of precipitation triggered landslides across Prince of Wales Island, blocking roads and damaging at least one bridge.
Prince of Wales Island, Alaska

Alaska Grown Black Walnuts
The unthinkable (ripe Alaska walnuts) a few decades ago is potentially our new reality as our climate continues to shift (warmer summers and longer falls). As our climatic parameters shift, so does our opportunity to diversify our edible plantings!
Peter's Creek
Facebook - Alaska Home Gardeners Group

Second year of Hemlock Looper Moth (Lambdina fiscellaria) outbreak returns to North Vancouver in larger numbers
The Hemlock Looper Moth outbreak is said to last between 3-4 years and now coincides with an outbreak of Phantom Hemlock Looper which saw its last outbreak more than a decade ago.
North Vancouver, British Columbia, Canada

Why are spruce trees turning orange in the Alaska Range?
The answer to the Tang-colored mystery involves tiny spruce needle rust fungus spores that also rely on Labrador tea plants to survive.
Healy, Alaska, United States
Anchorage Daily News

Large forest fire localized in Bilibin district
On Tuesday, August 4, paratroopers of Chukchi and Federal Aviation Protection stopped the spread of a large fire in the Bilibin district.
Chukotka Autonomous Okrug, Russia
Анадырь - Онлайн

Western Red Cedar die-off in Pacific Spirit Park
In the last few years, I have observed a significant die-off of Western red cedar in several high traffic and peripheral areas of Pacific Spirit Regional Park (PSRP). The majority of the cedar trees I saw were noticeably consumed by browning, small, and young, with most likely more shallow root systems. This is consistent with vegetative stress to which young trees have not developed resilience, but older trees may be less impacted
Vancouver, British Columbia, Canada
David Oswald, Cody Thomas, Lauren Wright

Spruce Trees Producing Huge Amounts of Cones
Unusually large cone crops may be the result of favorable variations in weather across several years.
Koyuk, Alaska, United States

All forest fires extinguished in Chukotka
All forest fires have been extinguished in Chukotka, where thousands of hectares of natural areas have been blazing before, according to the region's Department of Natural Resources and Ecology. RIA Novosti, 20.07.2020
Chukotka Autonomous Okrug, Russia
РИА Новости

Eastern Ontario in grip of worst Gypsy moth outbreak in 30 years
The worst Gypsy moth caterpillar outbreak in Eastern Ontario in 30 years is ripping through city backyard trees and rural forests at an alarming rate.Some pockets of forest north of Belleville, along Highway 7, look like stands of giant toothpicks after being picked clean of their foliage.
Belleville, Ontario, Canada
Belleville Intelligencer

Eastern Ontario in grip of worst Gypsy moth outbreak in 30 years
The worst Gypsy moth caterpillar outbreak in Eastern Ontario in 30 years is ripping through city backyard trees and rural forests at an alarming rate.Some pockets of forest north of Belleville, along Highway 7, look like stands of giant toothpicks after being picked clean of their foliage.
Eastern Canada
Belleville Intelligencer

Increasing catch of spruce bark beetles
"Throughout Viken in the lowlands there is an increasing evidence of spruce bark beetles and that is worrying. What is positive is that in Measure Package No 2 from the Government you receive financial compensation for wind fall logging and forest management" says Lars Kr. Haug, head of forestry at Viken Skog.
Viken county, Norway
Viken Skog

Record-breaking heatwave in Siberia
A prolonged heatwave in Siberia is “undoubtedly alarming”, climate scientists have said. The freak temperatures have been linked to wildfires, a huge oil spill and a plague of tree-eating moths.
Siberia, Russian Federation
the Guardian

New Ground Rising from First Lake
Noatak, Alaska, United States

Patches of Disrupted Trees
I noticed sections of trees that had fallen over and or had their tops broken off. I'm wondering if it was a micro storm or a disease that affected the trees.
Barnard, Vermont, United States

Roundheaded Wood Borer

They just keep coming: Tent caterpillar invasion coats Sask. home in insects — and feces
Hordes of tent caterpillars have covered Tammi Hanowski's home south of Saskatoon and have crawled up the walls and made their way into her pool.
Saskatoon, Saskatchewan, Canada
CBC

Landslide destroys Starrigavan restoration projects
High rainfall this month is being blamed for a major landslide near Sitka. The US Forest Service reports that a 100-acre slide came down in the Starrigavan Valley, about ten miles from town. The slide, and water damage to an ATV trail in the valley and other hiking trails elsewhere in Sitka -- all add up to a tough month for the agency.
Sitka, Alaska, United States
KCAW

Tent Caterpillar Infestation
At one point our entire red brick house was covered in the black caterpillars trying to reach the adjacent forest. The silk web-like nests began to appear on our trees in May and within weeks, the forests foliage was decimated.
Woodford, Ontario

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