The present invention relates to a method for controlling pests and/or fungi in a wooden construction, comprising the steps of: - arranging a number of supply channels with a diameter of a maximum of 6 mm at a centre-to-centre distance in the range of 30-70 cm in the wooden construction； - connecting the supply channels to a liquid reservoir using a supply system； and - supplying a liquid control agent to the supply channel at a supply pressure of 0-3 bar for a time interval of more than one day and injecting thereof into the wooden construction for the purpose of providing a prolonged saturation.
