Editing Pest control (section)

===Forestry===
{{Further|Forestry}}

Forest pests present a significant problem because it is not easy to access the canopy and monitor pest populations. In addition, forestry pests such as bark beetles, kept under control by natural enemies in their native range, may be transported large distances in cut timber to places where they have no natural predators, enabling them to cause extensive economic damage.<ref>{{cite book |author1=Lieutier, François |author2=Day, Keith R. |author3=Battisti, Andrea |author4=Grégoire, Jean-Claude |author5=Evans, Hugh F. |title=Bark and Wood Boring Insects in Living Trees in Europe, a Synthesis |url=https://books.google.com/books?id=XpgMBwAAQBAJ&pg=PA39 |year=2007 |publisher=Springer |isbn=978-1-4020-2241-8 |page=39}}</ref> [[Pheromone trap]]s have been used to monitor pest populations in the canopy. These release volatile chemicals that attract males. Pheromone traps can detect the arrival of pests or alert foresters to outbreaks. For example, the [[Choristoneura fumiferana|spruce budworm]], a destructive pest of [[spruce]] and [[balsam fir]], has been monitored using pheromone traps in Canadian forests for several decades.<ref name=Humme>{{cite book |author1=Humme, Hans E. |author2=Miller, Thomas A. |title=Techniques in Pheromone Research |url=https://books.google.com/books?id=C1nSBwAAQBAJ&pg=PA432 |year=2012 |publisher=Springer |isbn=978-1-4612-5220-7 |page=432}}</ref> In some regions, such as New Brunswick, areas of forest are sprayed with pesticide to control the budworm population and prevent the damage caused during outbreaks.<ref name=Macdonald1968>{{cite journal |last1=Macdonald |first1=D. R. |title=Management of Spruce Budworm Populations |journal=The Forestry Chronicle |volume=44 |issue=3 |year=1968 |pages=33–36 |doi=10.5558/tfc44033-3|doi-access=free }}</ref>