V. Gibbs-(j.), . An-dijk-(c.), and . Ebber-(j, Phytophthora Diseaseo fA lderin Europe.-Forestry Commission Bulletin, vol.8, p.2, 2003.

. Grosclaude-(c.), . Livier-(r.), and . Izzuto-(j.-c, R OMITI (C.). -É tude expérimentale dut ransport de l'inoculumd e Ceratocystisfimbriata f. platani parl'eaud'une rivière, European Journal of Forest Pathology, vol.2, issue.1, pp.168-171

, ). -S CAR-based PCR primers tod etectt he hybrid pathogen Phytophthoraa lni and its subspeciescausing alderdiseasei nE urope, European Journal of Plant Pathology, vol.1, pp.3-23, 2005.

. Jules-(e.), . Auffman-(m.), and . Itts-(w, C ARROLL (A.). -S pread of an invasivep athogen overavariable landscape: an onnativerootr oton Port Oxfordc edar, Ecology, vol.83, pp.3-167, 2002.

. Jung-(t, B LASCHKE (M.). -Phytophthora rootand collarr otof alders in Bavaria: distribution, modesof spread and possible managements trategies, vol.5, pp.197-208, 2004.

. ). Perrin-(r, -L eC hancred uHêtre, Revuef orestièref rançaise, vol.XXVI, pp.2-19

, ). -L aG raphiosed el 'Orme :une maladie dévastatrice àc ausesbien identifiées, Revuef orestièref rançaise, vol.5, pp.422-430, 1994.

, European Journal of Forest Pathology, vol.5, pp.97-111

J. Semal, T raitéd ep athologie végétale, vol.1, pp.989-621

, T ABARY (F.). -M ethodsforisolating the alder Phytophthora .-Forest Pathology, vol.32, pp.193-196, 2002.

. Themann-(k.), . Erres-(s.), and . Üttmann-(r, D IENER (H.A.). -O bservationsof Phytophthora spp.in water recirculation systemsin commercial hardyornamental nursery stock, European Journal of PlantPathology, vol.1, issue.08, pp.3-37, 2002.

, ). -I ncidence of Phytophthoraramorum inoculumf ound in soil collected from ah iking trail and hikers'shoesin aC alifornia park.-F irst Sudden Oak DeathS cience Symposium: The Stateo fO ur Knowledge, pp.15-18

. Vigouroux-(a, -L es" dépérissements" desPlatanes. Causes,i mportance, mesuresenvisageables, Revuef orestièref rançaise, vol.1, pp.2-8, 1979.

. Wilkinson-(a, S PIERS (A.). -I ntroduction of the poplarr usts Melampsoral arici-populina and M.medusae toN ewZealand and theirs ubsequentdistribution, NewZealand Journal of Science, vol.19, pp.195-198

. Weste-(g, L AW (C.). -T he invasion of nativef orest by Phytophthorac innamomi.III.Threatt othe National Park, Wilson's Promontory,V ictoria, Australian Journal of Botany, vol.25, pp.3-4, 1973.

, Rev. For. Fr. LVIII -4, 2006.

V. De-la-forêt-Àl-'eau-l'eau and . De-l'aulne,

, Avec l'air,l esol, le matériel végétal, la faune etl'activitéh umaine, l'eauest unvecteur potentiel d'agents pathogènes. Grâce aux zoospores,p ropagulesinfectieusesmotilesdansl'eau,l esparasitesdugenre Phytophthora sontparticulièrementconcernésparce mode de dissémination danslesmilieux anthropisés

, Nous avonsmené une enquêteé pidémiologiquee n2004 quiarévélé que1 7%desaulness ontmaladesle long de la Meuse, la Moselle, la Sarree tleurs affluents. Prèsde 80%dess itesprospectésr épartiss ur 35c ours d'eaus ontinfectés. Lesprincipaux facteurs de risquea ssociésàl am aladie sontla vitessed ucourantetla températured el 'eau. Lesr ivièresàe aux calmes ett empéréesde plateaux calcairesetde plainesprésententdest aux de dépérissementd'aulnesplus importants quel esr ivièresàe aux vivesetfraîchesde moyenne montagne, Le dépérissementdesaulnaiesen ripisylved ûà Phytophthoraa lni est unb on modèle d'étude dur ôle de l'eaude rivièred ansl'épidémiologie de la maladie

, Togetherw iththe air,soil, plantmaterial, the fauna and human activity,watert oo isap otential vectorfor pathogens. Through the zoospores,i nfectious propagulest hataref ree-moving in water,thismode of dissemination in anthropogenic environments (irrigated nurseries) and in natural environments isof particularr elevance withrespectt o Phytophthora genus parasites

, We conducted an epidemiological surveyin 2004thats howed that17%of the elders along the Meuse, the Moselle, and SarreR ivers and theirt ributariesared iseased. Nearly80%of the sitesinspected, distributed over3 5watercourses,a rei nfected.The main riskf actors associated withthe diseasea rethe speed of flowand the temperatureo fthe water. The rateo fe lderdieback ismoreseverewheretemperaterivers withquietw aters runthrough limestone tablelandsand plainst han wherec ool, fast-flowing rivers runthrough middle altitude mountains, Dieback of riverine elderforests dueto Phytophthoraa lni offers ag ood studymodel fort he role played by riverw aterin the epidemiologyof the disease