Pine dieback detected in 1,350 locations across Southwestern Finland

Pine dieback has been detected in 1,350 locations across Southwestern Finland, according to the University of Turku. The university’s announcement indicates that observations made by early August are primarily focused on the archipelago but also include the mainland coast.

In April, the university began collecting citizen observations through an online map service. Many of the reports from islands and waterfront areas suggest that summer cottage owners and boaters have shown keen awareness and concern regarding the situation. Some wonder if the phenomenon might continue to escalate and whether its spread can somehow be curtailed. Although removing affected trees could help, it is unlikely that the issue can be completely stopped with a chainsaw, says geography professor Risto Kalliola in the announcement.

Additionally, the university has been mapping pine dieback through satellite and aerial images. The phenomenon is well identified and widespread, and its increase may be linked to climate-related factors, according to the University of Turku. Early summer heat may have exposed pine trees to further damage.

June was also notably hot and dry in southwestern Finland; however, there has since been substantial rainfall. It’s possible that the trees were spared the worst of the dry stress during midsummer. The situation presents an intriguing research opportunity, and it will be interesting to observe the extent to which pines are now browning. Symptoms are already visible, Kalliola states in the announcement.

The University of Turku will continue to gather citizen observations regarding this issue.