The researchers were surprised: The scourge of pine trees is spreading in Finland
Nature|Hot and dry summers weaken the vitality of northern trees, which makes them easier to attack.
When The pine canopy tan and the tree may be poorly visible, with a beetle under its shell. This small insect has recently become more common in Finland and even surprised experts.
The ocher beetle is part of the traditional species of Finland, but in the past it has been low in quantity and has also been minor damage to the trees.
« Summer 2018 was record -breaking, then there were big forest fires in Sweden. Tiina Yrityja From the Natural Resources Center, Luke.
Since then, more pine crowns destroyed by Okakaarn beetles have been seen. The most dramatic examples are on the southwest coast and archipelago. Smaller deposits have been observed in Satakunta and Central Finland, says Ylioja.
« The beetle beetle was a surprise, it couldn’t be expected. It is exciting that it goes into pine trees of all ages. »
« The individual dead trees don’t have to worry about the forest owner. But it’s amazing that the pine trees now die for hundreds of years in the archipelago and have endured all kinds of weather. »
Pine crowns destroyed by ocaronic beetles.
Beetles Life includes eggs under the shell of the wood of the wood, where the tree both carries and stores nutrients. The larvae eat their corridors in the nilate layer.
The beetle beetle brings a blue sponge with it, which is cut by the mycelium in the mantle, that is, the surface tree from the roots of water to the top of the water. The tree dies thirsty.
Many other beetlers start at the base, but the ocal beetle is powered by the tree top.
The mushroom called the coniferous parikka has also been found in the trees of the ocal beetle. According to the Ylleja, it is not yet known how much the occurrence of a coniferous pair in the tree affects the fact that the oca -beetle can be attacked by the wood.
Okakaarn beetle is especially a scourge of pine and a printer spruce. There are several other insect species to eat on the nilate layer of the conifers, such as spruce strokes and aomonic writer, as well as a small book printer and gloss book printer.
“These on that side also become more abundant. They each have their own eco -compartment,” says Ylioja.
Bark beetles typically do not fly long distances. Thus, the new occasional beetle deposit is usually located as much as 100 meters from the previous one.
Climate change With the help of the ocal beetle, the printer and other species of bark beetles, there have been more comfortable ones in Finland. Hot and dry summers weaken the vitality of northern trees, which makes them easier to attack. In addition, in the warm, insects develop faster.
« Trees suffering from drought are susceptible to bark beetles. There have been many warmer summers in Finland. The metabolism of trees has changed and resistance has decreased, » Ylioja explains.
« When there is a suitably weak wood, the bark beetles start to grow more. When they are very much, they are able to go to healthy trees by force. »
Eating pattern in the wooden frame in the tree trunk.
The winter storms of the lacking and low snowy winters also play a role. If there are a lot of fir trees in the storm and some of their roots are still on the ground, fallen trees are a great breeding ground, especially for the printer. If the next summer is hot and dry, the bark beetles will continue to increase.
Needles Cancer coniferous is rare in Finland, but as the climate warms, it has spread to the north. In Poland, Germany and Austria, coniferous mass deposits have caused extensive forest damage.
« As climate change progresses, new harmful species to Finland will be able to hinder forestry, » says Päivi Lyytikäinen-SaaremaaForestry expert company Tapio’s senior advisor.
2023 was the warmest in the world’s so -called weather observation, but 2024 turned even warmer.
