Editing Sumac (section)

==Toxicity and control==
Some species formerly recognized in ''Rhus'', such as [[poison ivy]] (''Toxicodendron radicans'', [[syn.]] ''Rhus toxicodendron''), [[Rhus diversiloba|poison oak]] (''Toxicodendron diversilobum'', syn. ''Rhus diversiloba''), and [[poison sumac]] (''Toxicodendron vernix'', syn. ''Rhus vernix''), produce the allergen [[urushiol]] and can cause severe delayed hypersensitivity reactions. Poison sumac may be identified by its white drupes, which are quite different from the red drupes of true ''Rhus'' species.<ref>{{cite web|url= https://www.britannica.com/plant/poison-sumac|title=Poison sumac|publisher=Encyclopedia Brittanica}}</ref>

Mowing of sumac is not a good control measure, since the wood is springy, resulting in jagged, sharp-pointed stumps when mown. The plant will quickly recover with new growth after mowing.<ref>{{cite web |url=http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=2298&context=extensionhist |first1=John |last1=Ortmann |last2=Miles |first2=Katherine L. |last3=Stubbendieck |first3=James H. |last4=Schacht |first4=Walter |title=Management of Smooth Sumac on Grasslands |series=Historical Materials from University of Nebraska-Lincoln Extension |publisher=University of Nebraska-Lincoln |year=1997 |access-date=July 27, 2024}}</ref> [[Goats]] have long been considered an efficient and quick removal method, as they eat the bark, which helps prevent new shoots. Sumac propagates by [[rhizome]]. Small shoots will be found growing near a more mature sumac tree via a shallow running root quite some distance from the primary tree. Thus, root pruning is a means of control without eliminating the plants altogether.{{citation needed|date=June 2023}}