https://www.woodweb.com/knowledge_base/FieldTreating_Doug_Fir_Timbers.html
Field-Treating Doug Fir Timbers for Insects
Impermeable woods such as Douglas fir are very difficult to successfully treat with insecticide. March 3, 2009
field treatingdoug firtimbersinsects
https://pure.northampton.ac.uk/en/publications/molecular-analysis-of-paired-tumours-time-to-start-treating-the-f/
Molecular analysis of paired tumours: time to start treating the field. - University of...
time to startmolecular analysis