A forest with more mixed tree types can reduce the problem of spruce bark beetle, according to a new thesis. Matilda Lindmark, PhD in biology at Mid Sweden University, says that increased diversity of tree types is necessary to protect forests from damage.
Lindmark's research has been part of the forest damage network set up by the Swedish Forest Agency when the spruce bark beetle problem came to light around 2012. She has shown that it is in the spruce forest that most spruce bark beetles are caught, and that the more pine, the more natural enemies and fewer spruce bark beetles.
In her thesis, Lindmark has studied forest damage in managed forests in Jämtland and Västernorrland. She has also studied how traps can reduce the risk of spruce bark beetle infestation, and has found new substances that can deter the bark beetles.
Mushrooms have been used as bait in the traps, and Lindmark believes that mushroom scents could be an even more effective way of discouraging bark beetles from flying to the traps. She has also studied alternative wildlife repellents and has developed one that is cheaper and works even in cold weather.
