Tree

===Other uses===
[[File:Sri Lanka-Rubber plantation (5).JPG|thumb|upright|[[Latex]] collecting from a [[Hevea brasiliensis|rubber tree (''Hevea brasiliensis'')]]]]
{{further|Resin|Latex|Camphor}}

Latex is a sticky defensive secretion that protects plants against [[herbivore]]s. Many trees produce it when injured but the main source of the latex used to make [[natural rubber]] is the Pará rubber tree (''Hevea brasiliensis''). Originally used to create bouncy balls and for the waterproofing of cloth, natural rubber is now mainly used in tyres for which synthetic materials have proved less durable.<ref>{{cite web |url=http://www.azom.com/article.aspx?ArticleID=2101 |title=Natural rubber: History and Developments in the Natural Rubber Industry |author=Baker, C |year=1997 |work=Materials World |publisher=AZoM.com |access-date=26 July 2012 |archive-date=28 July 2012 |archive-url=https://web.archive.org/web/20120728170522/http://www.azom.com/article.aspx?ArticleID=2101 |url-status=live }}</ref> The latex exuded by the balatá tree (''[[Manilkara bidentata]]'') is used to make [[golf ball]]s and is similar to [[gutta-percha]], made from the latex of the "getah perca" tree ''[[Palaquium]]''. This is also used as an insulator, particularly of undersea cables, and in dentistry, walking sticks and gun butts. It has now largely been replaced by synthetic materials.<ref>{{cite web |url=http://www.atlantic-cable.com/Article/GuttaPercha/ |title=The Gutta Percha Company |author=Burns, Bill |date=15 February 2010 |work=History of the Atlantic Cable and Undersea Communications |access-date=26 July 2012 |archive-date=23 April 2018 |archive-url=https://web.archive.org/web/20180423170435/http://atlantic-cable.com/Article/GuttaPercha/ |url-status=live }}</ref>

Resin is another plant exudate that may have a defensive purpose. It is a viscous liquid composed mainly of volatile [[terpene]]s and is produced mostly by coniferous trees. It is used in varnishes, for making small castings and in [[ten-pin bowling]] balls. When heated, the terpenes are driven off and the remaining product is called "rosin" and is used by stringed instrumentalists on their [[Bow (music)|bows]]. Some resins contain [[essential oil]]s and are used in [[incense]] and [[aromatherapy]]. Fossilised resin is known as amber and was mostly formed in the Cretaceous (145 to 66 million years ago) or more recently. The resin that oozed out of trees sometimes trapped insects or spiders and these are still visible in the interior of the amber.<ref>{{cite web |url=http://gurukul.ucc.american.edu/ted/amber.htm |title=Amber Trade and the Environment in the Kaliningrad Oblast |author=Jacobson, Douglas |year=1997 |work=The Mandala Projects |access-date=26 July 2012 |url-status=dead |archive-url=https://web.archive.org/web/20120706182814/http://gurukul.ucc.american.edu/ted/amber.htm |archive-date=6 July 2012 }}</ref>

The camphor tree (''[[Cinnamomum camphora]]'') produces an essential oil<ref name=spices/> and the eucalyptus tree (''[[Eucalyptus globulus]]'') is the main source of [[eucalyptus oil]] which is used in medicine, as a fragrance and in industry.<ref>{{cite web |url=http://www.fao.org/docrep/v5350e/v5350e07.htm |publisher=Food and Agriculture Organization of the United Nations |title=Chapter 5: Eucalyptus oil |work=Flavours and fragrances of plant origin |access-date=19 March 2015 |archive-date=2 May 2012 |archive-url=https://web.archive.org/web/20120502162220/http://www.fao.org/docrep/V5350E/V5350e07.htm |url-status=live }}</ref>