Well-known hardwoods -> maple, birch, beech, oak, ash, linden
Well-known softwoods -> spruce, fir, larch, pine
The development time of the pests listed here can multiply in unfavorable conditions. Wood pests can certainly tolerate higher temperatures; they simply retreat to the deeper, cooler heartwood. It is therefore very important to warm the heartwood. This deprives the pest of the opportunity to retreat. Only by adhering to the treatment times can it be ensured that the pests have died.