International Forestry

Trees Keep Cities Cool

Road surfaces, pavements and buildings all contribute to keeping urbanized environments hotter than surrounding non-urbanized areas. The urban heat island effect occurs around the clock as dense dark surfaces such as asphalt on roads and building materials accumulate and store heat during the day and then release it at night. One of the simplest solutions to reducing the urban heat island effect is to provide more shade with trees.

Toronto: An urban forest in crisis

Toronto’s urban forest is in trouble. Climate change is set to have a major impact and planners must scramble to temper the fast growth of invasive species.

As the city tries to expand its canopy, mistakes from the past are showing why tree choice and smart planning matter for the coming years.

Cities are already a hostile place for trees to grow. The “heat island” effect creates a climate too warm for comfort, salt from the winter is damaging, the soil is suffering from nutrient degradation and root systems often go into shock.

WI State Forester and NASF President to Participate in FAO's Committee on Forestry Sessions

The biennial sessions of the Committee on Forestry (COFO) will take place in Rome, Italy from July 18-22. Follow along on social media using the hashtag #COFO23.

COFO is the highest forestry-related statutory body of the Food and Agriculture Organization (FAO) of the United Nations. Wisconsin State Forester and NASF President Paul DeLong will represent state forestry issues on behalf of NASF.

Toronto's Urban Forest Increasingly Stressed

A report published by the Green Infrastructure Ontario Coalition entitled “The State of the Urban Forest in the Greater Toronto Area” concludes that the area’s urban forests are increasingly stressed and that governments must invest in “living, green infrastructure” in order to protect this vital asset. The report cites the benefits delivered by urban forests, such as increased air quality and reduced temperatures.

Climate Change Could Put Eucalypts at Fatal Risk

Climate change is set to bring rising temperatures, more frequent heatwaves and more droughts. Since trees cannot migrate to get away from heat and lack of water, they rely on such strategies as dropping leaves and reducing evaporation of water from leaves to cope.

"This places eucalypts — and possibly other tree species — at risk from anticipated rapid changes in climate," said the researchers, led by Dr Sebastian Pfautsch from Western Sydney University's Hawkesbury Institute for the Environment

Tests find trees tolerant to olive tree killer pathogen

Tests suggests some varieties of olive trees appear to be resistant to an invasive pathogen posing a serious risk to Europe's olive industry.

The findings came to light during a study into the host range of the bacteria, which reached Europe in 2013. The findings offer hope of limiting the impact of Xylella fastidiosa that experts described as one of the "most dangerous plant pathogens worldwide". If it is not controlled, it could decimate the EU olive oil industry.