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��scription: <br />Black locust is a fast growing trec, hcight 40-10U' <br />(12-30m); niature trees have furrowed dark <br />brown bark wi[h flat-topped ridges, seedlin�s and <br />snrouts have lon� tl�orns and grow rapidly. <br />Leaves alternate, pinnately compound, 7-21 <br />elliptic or rounded leaflets, dark green above, <br />pale beneath. Fragrant white flowers appearing <br />in May or June have a yellow blo�ch on the <br />uppermost petaI, and appear in drooping <br />racemes. Fruit pods are smoolli, 2-4" (5-�Oaii) <br />long, containing 4-8 seeds. <br />Coneern: <br />Black locusi is native to ihe souU►eastern United <br />States on the lower slopes of lhe Appalachian <br />Mountaii�s, with outliers north along thc slopes <br />and forest edges of soulhern fllinois. lndiana, and <br />Missouri, This trce has been planicd cxtensively <br />for iCs nitrogen fixing abilitics, to provide nectar <br />for honey bees, hardwood lumbcr, erosion control <br />and as fence posts. ll is commonly found in <br />disturbed areas such as old fields, degradcd <br />�4•oods, and roadsidcs. Tl�e trecs prefer si�cs witn <br />full sun and little cornpetition. Blacic locust <br />reproduces vigorously by root suckering ar►d <br />stump s�routing to Form groves oCtrees <br />interconnected by a corn�tton Gbrous root system. <br />Physical damage lo roots and slems increascs 81ack locust, Robinia pseudoacacla, in flower <br />suClteCing ��id sprouting, m�ilcing con�rol difficult. <br />Once estabiisl�ed, black locust cro��•ds out native <br />�egetation in pr�iries. upland forests and o��k savannahs. MN interagency Exotic Species Task Force 1991 current <br />threat ranking of MODERATE, tuture Ehreat rai�lcing of SEVERE. <br />B�aelc Locust <br />Robinia psezcc�oacacra <br />E�one�-ol: <br />1V�id-.lune to August: Hand appkication of G.23% Roundu�� (glyphusatc) solution (1�:1 water:Rowidu}�) to cut <br />siumps has been used by MN DNR Region V State Parks Resource Management. Resprouting and suckering front <br />dense cianes may require foilo«� up lreatmenl after a few years*. Litcr�ture also describes good to excelient si�ecess <br />at Ehis concentration. <br />Xear-round: A 25'/� Garlon � solution in basal oil appGed tivilit bacicpacic spra}�ers itas been used on cut suirops <br />by tlie Scientific and Natural Amas Program in Minnesola. Tl�oroughly wet Elie cut stump a�tcE barlc belaw tl�e cut, <br />down to lhe root coUar, but avoid nuioff. <br />*Apparcntly kilked plan�s ca�z resprou� sevcral ��ears after mos� al� �reatinen�s, rcquinng annual or every other year <br />monitoring. <br />This iaformation is not an �ndorsem�ni oFpartiajiar �roduc�s pr practiccs. Peslicidr usc must follow lahzl Jireciions and npplicable slute nnd fed�ral iaws. <br />c <br />0 <br />m <br />W <br />Y <br />Mi»ncsota llepartmrn� Sources on filt witl� t�[N DNR Rtgion V Stalc Parks Rcsourca �4an:ig�r- �'OS195 <br />oTNatural Resources 7-NC Elemznt StewarJship Absiracl (ur Hobrmo pse+�docrcacrn blocustZ.doc <br />Region V(507)285-7432 illinois Nature Preserves Commission Vegeta�ion tvlanagunent Guide{in� on Lilach l.ocust SPWlKEI3 <br />