Ornamental Plant Disease Management Assistant

Disease diagnosis and control have been among the most challenging tasks that growers, landscapers, and homeowners have to face on a daily basis. This difficulty results from the great diversity of plants grown, the complexity of disease problems associated with individual plants, and a lack of access to research data. This publication is designed to assist you in the process of disease diagnosis and management recommendations. A list of diseases was compiled for individual plants based on the records at Virginia Tech's Plant Disease Clinic and at the Hampton Roads Agricultural Research and Extension Center over the past 6 years. Use of this list can help you determine what to look for in a given plant species. Diagnostic characters provided for some common and distinguishable diseases can help narrow down the scope of possible causes. Informative disease fact sheets also are supplied through web links. In many cases, these fact sheets provide the additional assistance you may need to reach a diagnosis and recommend what actions to take for disease management. We hope you will find this publication is not only a practical tool for solving disease problems in the real world, but also a window for learning about plant pathology.

A-Z Links to Scientific Names
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

A Genus Common Name Diagnosis Pathogen Diagnostic Characteristics Factsheet Abies fir   Botrytis blight Botrytis cinerea gray fuzzy mold http://plantclinic.cornell.edu/FactSheets/botrytis/botrytis_blight.htm   Cytospora canker Cytospora abietis   http://www.ext.colostate.edu/pubs/Garden/02937.html   oedema     http://plantclinic.cornell.edu/FactSheets/oedema/oedema.htm   Phytophthora root rot Phytophthora cinnamomi   http://www.ext.vt.edu/pubs/plantdiseasefs/450-615/450-615.html Acer maple   anthracnose Discula sp.   http://www.ext.vt.edu/pubs/plantdiseasefs/450-604/450-604.html   bacterial scorch Xylella fastidiosa   http://www.aces.edu/department/extcomm/publications/anr/anr-1050/anr-1050.htm   bacterial wetwood     http://www.ext.colostate.edu/pubs/garden/02910.html   Botryosphaeria dieback Botryosphaeria sp.   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/bot_cank.html   Cytospora canker Cytospora sp.   http://www.ext.colostate.edu/pubs/Garden/02937.html   Ganoderma root & butt rot Ganoderma sp.   http://www.forestpests.org/southern/Diseases/lucds.htm   leafspot Phyllosticta minima, Septoria sp.   http://www.extension.umn.edu/projects/yardandgarden/ygbriefs/p414anthracnosemaple.html   Nectria canker Nectria galligena   http://www.forestpests.org/southern/Diseases/nectria.htm   Phoma on bark Phoma sp.       Phomopsis dieback Phomopsis sp.       Phomopsis dieback Phomopsis sp.   http://www.ipm.uiuc.edu/publications/rpds/rpd636/rpd636.html   purple-eye leafspot Phyllosticta minima   http://www.extension.umn.edu/projects/yardandgarden/ygbriefs/p414anthracnosemaple.html   tar spot Rhytisma acerinum   http://www.extension.umn.edu/projects/yardandgarden/ygbriefs/p414anthracnosemaple.html   Valsa canker         verticillium wilt Verticillium albo-atrum   http://www.ext.vt.edu/pubs/plantdiseasefs/450-619/450-619.html   wood decay     http://www.forestpathology.org/decay.html   zonate leafspot Cristulariella pyramidalis   http://www.aces.edu/department/extcomm/publications/anr/anr-606/anr-606.html Acer negundo boxelder   wood decay     http://www.forestpathology.org/decay.html Aconitum bear's breeches, monkshood   Southern blight Sclerotium rolfsii   http://www.aces.edu/department/extcomm/publications/anr/anr-1157/anr-1157.html Aegopodium goutweed   leafspot Septoria sp.   http://www.hort.uconn.edu/ipm/homegrnd/htms/27leafsp.htm Aesculus buckeye   Guignardia blotch Guignardia aesculi   http://ohioline.osu.edu/hyg-fact/3000/3044.html Agave century plant   crown rot       Ageratum floss flower   Southern blight Sclerotium rolfsii   http://www.aces.edu/department/extcomm/publications/anr/anr-1157/anr-1157.html Agrostis bentgrass   anthracnose Colletotrichum graminicola       brown patch Rhizoctonia solani   http://hgic.clemson.edu/factsheets/HGIC2150.htm   deadspot Ophiosphaerella agrostis   http://plantclinic.cornell.edu/FactSheets/bentgrassdeadspot/Bentgrass%20Deadspot.htm   dollar spot Sclerotinia homeocarpa   http://plantclinic.cornell.edu/FactSheets/dollar_spot/dollar_spot.htm   Fusarium blight Fusarium sp.   http://aggie-horticulture.tamu.edu/plantanswers/turf/publications/fusarium.html   melting out Bipolaris sorokiniana   http://www.ianr.unl.edu/pubs/plantdisease/g925.htm   nematodes     http://www.utextension.utk.edu/pbfiles/pb842.pdf   pink patch Limonomyces roseipellis   http://www.utextension.utk.edu/pbfiles/pb842.pdf   Pythium blight Pythium sp.   http://www.agcom.purdue.edu/AgCom/Pubs/BP/BP-109-W.pdf   Pythium crown rot Pythium sp.   http://www.agcom.purdue.edu/AgCom/Pubs/BP/BP-109-W.pdf   rust Puccinia sp.   http://www.utextension.utk.edu/pbfiles/pb842.pdf   take-all Gaeumannomyces graminis   http://www.utextension.utk.edu/pbfiles/pb842.pdf   yellow patch Rhizoctonia cerealis   http://www.oznet.ksu.edu/path-ext/factSheets/Turf/Rhizoctonia%20Yellow%20Patch%20of%20Creeping%20Bentgrass.asp Ailanthus tree-of-heaven   Fusarium Fusarium sp.   http://hortipm.tamu.edu/pestprofiles/disease/fusrot/fusrot.html Ajuga bugleweed   Phomopsis stem dieback Phomopsis sp.   http://aesop.rutgers.edu/~floriculture/publications/SDOLF.htm   Phytophthora root rot Phytophthora sp.   http://cufan.clemson.edu/pestmgmtguide/documents/ANNUALS%20AND%20PERPYTHIUM,%20PHYTOPHTHORA.htm   Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm   Rhizoctonia root & crown rot Rhizoctonia solani   http://www.ipm.iastate.edu/ipm/hortnews/1999/7-30-1999/rhizcutrot.html   root knot nematode Meloidogyne sp.   http://ohioline.osu.edu/hyg-fact/3000/3115.html   Southern blight Sclerotium delphinii   http://www.aces.edu/department/extcomm/publications/anr/anr-1157/anr-1157.html   virus         web blight Rhizoctonia solani   http://www.nysipm.cornell.edu/publications/bpguide98/cont.dis.html Albizia julibrissin mimosa   mimosa wilt Fusarium oxysporum   http://www.fl-dof.com/Pubs/Insects_and_Diseases/td_hrd_mimosa_wilt.htm Alcea hollyhock   rootknot nematodes Meloidogyne sp.   http://ohioline.osu.edu/hyg-fact/3000/3115.html   rust Puccinia malvacearum   http://www.ext.vt.edu/pubs/plantdiseasefs/450-613/450-613.html Amelanchier serviceberry   cedar-quince rust Gymnosporangium clavipes   http://ohioline.osu.edu/hyg-fact/3000/3055.html   Entomosporium leafspot Entomosporium mespili   http://www.ext.vt.edu/pubs/plantdiseasefs/450-609/450-609.html Anemone     foliar nematode Aphelenchoides sp.   http://www.agnr.umd.edu/users/hgic/diagn/flow/foliar_nematodes.html   Phytophthora root rot Phytophthora sp.   http://cufan.clemson.edu/pestmgmtguide/documents/ANNUALS%20AND%20PERPYTHIUM,%20PHYTOPHTHORA.htm Antirrhinum snapdragon   crown rot Phytophthora parasitica       downy mildew Peronospora antirrhini   http://floriculture.osu.edu/archive/feb99/downym.html   Phytophthora root rot Phytophthora sp.       Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm   Rhizoctonia stem rot Rhizoctonia solani   http://www.ag.uiuc.edu/cespubs/hyg/html/200214c.html   rust Puccinia antirrhini   http://www.caes.state.ct.us/PlantPestHandbookFiles/pphS/pphsnap.htm   Verticillium wilt Verticillium albo-atrum       virus INSV necrotic spots, mosaic   Aquilegia columbine   Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm Arctostaphylos uva-ursi bearberry, jnnickinick   Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm   Phytophthora root rot Phytophthora cinnamomi   http://cufan.clemson.edu/pestmgmtguide/documents/ANNUALS%20AND%20PERPYTHIUM,%20PHYTOPHTHORA.htm Arisaema jack-in-the-pulpit   rust Uromyces sp.     Armeria sea thrift   web blight Rhizoctonia solani   http://www.nysipm.cornell.edu/publications/bpguide98/cont.dis.html Aronia chokeberry   Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm Artemisia dusty miller   Rhizoctonia root & stem rot Rhizoctonia solani   http://www.ipm.iastate.edu/ipm/hortnews/1999/7-30-1999/rhizcutrot.html Asclepias milkweed   anthracnose Colletotrichum sp.     Asclepias tuberosa butterfly weed   Rhizoctonia stem rot Rhizoctonia solani   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/begonia.html Aster     powdery mildew Erysiphe cichoracearum powdery white growth of fungus on plant surface http://www.ext.vt.edu/pubs/plantdiseasefs/450-603/450-603.html   rust Puccinia sp.   http://www.yoder.com/grower/asters/insect/content.asp Astilbe     Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm Aucuba     anthracnose Colletotrichum gloeosporioides   http://www.ces.ncsu.edu/depts/pp/notes/Ornamental/od21aucuba/od21aucuba.htm   Botryosphaeria dieback Botryosphaeria sp.   http://www.ces.ncsu.edu/depts/pp/notes/Ornamental/od21aucuba/od21aucuba.htm   leafspot Pestalotia sp., Phyllosticta aucubae   http://www.ces.ncsu.edu/depts/pp/notes/Ornamental/od21aucuba/od21aucuba.htm   Phomopsis dieback Phomopsis sp.   http://www.ces.ncsu.edu/depts/pp/notes/Ornamental/od21aucuba/od21aucuba.htm   ring nematodes Criconemella sp.   http://www.ces.ncsu.edu/depts/pp/notes/Ornamental/od21aucuba/od21aucuba.htm B Genus Common Name Diagnosis Pathogen Diagnostic Characteristics Factsheet bamboo     Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm   rust Puccinia sp.     bedding plants     damping-off Rhizoctonia solani   http://floriculture.osu.edu/archive/feb00/dmpoff.html Begonia     anthracnose Gloeosporium sp.   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/begonia.html   Botrytis blight Botrytis cinerea gray fuzzy mold http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/begonia.html   nematodes, root knot Meloidogyne sp.   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/begonia.html   powdery mildew Oidium begoniae powdery white growth of fungus on plant surface http://www.ext.vt.edu/pubs/plantdiseasefs/450-603/450-603.html   root & stem rot Rhizoctonia sp.   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/begonia.html   stem rot Fusarium sp.   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/begonia.html Berberis barberry   Phytophthora root rot Phytophthora sp.   http://www.ext.vt.edu/pubs/plantdiseasefs/450-615/450-615.html Bergenia     Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm Betula birch   anthracnose Discula betulina, Gloeosporium sp.   http://www.ext.vt.edu/pubs/plantdiseasefs/450-604/450-604.html   Botryosphaeria dieback Botryosphaeria sp.   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/bot_cank.html   Botrytis blight Botrytis cinerea gray fuzzy mold http://www.agnr.umd.edu/users/hgic/pubs/online/hg58.pdf   red heart Torula ligniperda   http://www.agnr.umd.edu/users/hgic/pubs/online/hg58.pdf   Septoria leafspot Septoria betulicola   http://www.agnr.umd.edu/users/hgic/pubs/online/hg58.pdf Buddleia butterflybush   canker & dieback         Phytophthora root rot Phytophthora cinnamomi   http://www.ext.vt.edu/pubs/plantdiseasefs/450-615/450-615.html   Rhizoctonia root rot Rhizoctonia solani     Buxus boxwood   Botryosphaeria dieback Botryosphaeris sp.   http://www.ext.vt.edu/pubs/plantdiseasefs/450-614/450-614.html   boxwood decline     http://www.ext.vt.edu/pubs/plantdiseasefs/450-614/450-614.html   Macrophoma leafspot Macrophoma candollei   http://www.ext.vt.edu/pubs/plantdiseasefs/450-614/450-614.html   nematodes: dagger, lesion, ring, spiral     http://www.ext.vt.edu/pubs/plantdiseasefs/450-614/450-614.html   Phytophthora root rot Phytophthora parasitica   http://www.ext.vt.edu/pubs/plantdiseasefs/450-614/450-614.html   Volutella blight Volutella buxi   http://www.ext.vt.edu/pubs/plantdiseasefs/450-614/450-614.html C Genus Common Name Diagnosis Pathogen Diagnostic Characteristics Factsheet   cactus   Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm Caladium     Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm Calibrachoa million bells   Phytophthora crown rot Phytophthora parasitica   http://cufan.clemson.edu/pestmgmtguide/documents/ANNUALS%20AND%20PERPYTHIUM,%20PHYTOPHTHORA.htm   Rhizoctonia root rot Rhizoctonia solani   http://www.ag.uiuc.edu/cespubs/hyg/html/200214c.html   root rot         Southern blight Sclerotium rolfsii   http://www.aces.edu/department/extcomm/publications/anr/anr-1157/anr-1157.html Calocedrus incensecedar   Seiridium canker Seiridium sp.   http://www.plant.uga.edu/Extension/fungi/Seiridium.html Camellia     anthracnose Colletotrichum gloeosporoides       Botryosphaeria dieback Botryosphaeria sp.       canker Colletotrichum sp.   http://hgic.clemson.edu/factsheets/HGIC2053.htm   gray blight Pestalotiopsis maculans       leaf & flower gall Exobasidium camelliae   http://hgic.clemson.edu/factsheets/HGIC2053.htm   leafspot Alternaria sp., Colletotrichum sp., Phyllosticta camelliae       oedema     http://plantclinic.cornell.edu/FactSheets/oedema/oedema.htm   Phytophthora root rot Phytophthora cinnamomi   http://www.ext.vt.edu/pubs/plantdiseasefs/450-615/450-615.html   Pythium root rot Pythium sp.   http://www.ag.uiuc.edu/cespubs/hyg/html/199815e.html   virus     http://www.ces.uga.edu/Agriculture/plantpath/plantdis/Wornamental/Camellia/Camvirus.htm Campanula bellflower   Fusarium crown rot Fusarium solani   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/begonia.html Campsis radicans trumpet vine   spot anthracnose Elsinoe sp.     Canna canna lily   lesion nematodes Pratylenchus sp.       Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm Carpinus hornbeam   Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm Carya hickory   downy leafspot Microstoma juglandis   http://plantclinic.cornell.edu/FactSheets/hickorydownyleafspot/hickorydownyleafspot.htm   Gnomonia leafspot Gnomonia caryae   http://hgic.clemson.edu/factsheets/HGIC2211.htm   Phomopsis gall Phomopsis sp.   http://www.dnr.state.mn.us/fid/august97/08259711.html   powdery mildew Microsphaera penicillata powdery white growth of fungus on plant surface http://www.ext.vt.edu/pubs/plantdiseasefs/450-603/450-603.html   zonate leafspot Cristulariella moricola   http://www.aces.edu/department/extcomm/publications/anr/anr-606/anr-606.html Caryopteris bluebeard   Phytophthora stem & root rot Phytophthora cinnamomi   http://www.ext.vt.edu/pubs/plantdiseasefs/450-615/450-615.html   Pythium root rot Pythium sp.   https://courseware.vt.edu/users/abaudoin/at0434/Phytophthora.pdf Catalpa     bacterial wetwood     http://www.ext.colostate.edu/pubs/garden/02910.html Catharanthus Madagascar periwinkle, annual vinca   black root rot Thielaviopsis basicola   http://www.aces.edu/department/extcomm/publications/anr/anr-1023/anr-1023.html   Botrytis blight Botrytis cinerea gray fuzzy mold http://www.aces.edu/department/extcomm/publications/anr/anr-1023/anr-1023.html   Botrytis stem canker Botrytis cinerea gray fuzzy mold http://www.aces.edu/department/extcomm/publications/anr/anr-1023/anr-1023.html   Phytophthora blight Phytophthora parasitica   http://www.aces.edu/department/extcomm/publications/anr/anr-1023/anr-1023.html   Phytophthora stem rot Phytophthora parasitica   http://www.aces.edu/department/extcomm/publications/anr/anr-1023/anr-1023.html   Pythium root rot Pythium sp.   http://www.aces.edu/department/extcomm/publications/anr/anr-1023/anr-1023.html   Rhizoctonia stem & root rot Rhizoctonia solani   http://www.ipm.iastate.edu/ipm/hortnews/1999/7-30-1999/rhizcutrot.html Cattleya orchid   bacterial brownspot Pseudomonas cattleyae   http://www.caes.state.ct.us/PlantPestHandbookFiles/pphO/pphorch.htm Cedrus cedar   Armillaria root rot Armillaria mellea White, fan-shaped fungal mats of growth under the bark http://www.ipm.uiuc.edu/publications/rpds/rpd602/rpd602.html Celosia     Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm   Rhizoctonia root rot Rhizoctonia solani   http://www.ag.uiuc.edu/cespubs/hyg/html/200214c.html Cercis redbud   Botryosphaeria dieback Botryosphaeria dothidea   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/bot_cank.html   Botrytis blight Botrytis cinerea gray fuzzy mold http://plantclinic.cornell.edu/FactSheets/botrytis/botrytis_blight.htm   Fusarium canker Fusarium lateritum   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/canktree.html   leafspot Pestalotia sp., Pseudocercospora vitis   http://www.hort.uconn.edu/ipm/homegrnd/htms/27leafsp.htm   Verticillium wilt Verticillium dahliae       wood decay     http://www.forestpathology.org/decay.html Chamaecyparis falsecypress   Phytophthora root rot Phytophthora cinnamomi   http://www.ext.vt.edu/pubs/plantdiseasefs/450-615/450-615.html   Seiridium canker Seiridium unicorne       web blight Rhizoctonia solani   http://www.westernfarmservice.com/newsletters/turf/rhizoctonia.pdf Chionanthus fringetree   algal leafspot Cephaleuros sp.   http://www.aces.edu/department/extcomm/publications/anr/anr-943/anr-943.html   leafspot Phomopsis sp., Phyllosticta chionanthe   http://www.hort.uconn.edu/ipm/homegrnd/htms/27leafsp.htm Chrysanthemum daisy   Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm   web blight Rhizoctonia solani   http://www.nysipm.cornell.edu/publications/bpguide98/cont.dis.html Chrysogonum goldenstar, green and gold   Southern blight Sclerotium rolfsii   http://www.aces.edu/department/extcomm/publications/anr/anr-1157/anr-1157.html Cladastris yellowwood   anthracnose Gloeosporium sp.     Clematis     Phoma leafspot & stem canker Phoma sp.     Clivia Kaffir lily   leafspot Coniothyrium sp.       Southern blight Sclerotium rolfsii   http://www.aces.edu/department/extcomm/publications/anr/anr-1157/anr-1157.html Coleus     Botrytis blight Botrytis cinerea gray fuzzy mold http://plantclinic.cornell.edu/FactSheets/botrytis/botrytis_blight.htm Consolida larkspur   Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm   Rhizoctonia crown & root rot Rhizoctonia solani   http://www.ipm.iastate.edu/ipm/hortnews/1999/7-30-1999/rhizcutrot.html Coreopsis tickseed   Botrytis blight Botrytis cinerea gray fuzzy mold http://plantclinic.cornell.edu/FactSheets/botrytis/botrytis_blight.htm   root & stem rot Rhizoctonia solani   http://www.msue.msu.edu/imp/modc1/90597006.html   rust Coleosporium inconspicuum   http://www.fl-dof.com/Pubs/Insects_and_Diseases/td_cfd_needle_rust.htm   virus tomato ringspot virus ringspot   Cornus dogwood   anthracnose Colletotrichum gloeosporioides   http://www.ext.vt.edu/pubs/plantdiseasefs/450-611/450-611.html   Botryosphaeria canker Botryosphaeria sp.   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/bot_cank.html   Botryosphaeria dieback Botryosphaeria sp.   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/bot_cank.html   Botrytis blight Botrytis cinerea gray fuzzy mold http://plantclinic.cornell.edu/FactSheets/botrytis/botrytis_blight.htm   Discula anthracnose Discula destructiva   http://www.ext.vt.edu/pubs/plantdiseasefs/450-611/450-611.html   Fusarium canker Fusarium sp.   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/canktree.html   leafspot Cercospora sp., Discosia sp., Phyllosticta sp., Septoria cornicola   http://www.ext.vt.edu/pubs/plantdiseasefs/450-611/450-611.html   Phomopsis dieback Phomopsis sp.       powdery mildew Oidium sp. powdery white growth of fungus on plant surface http://www.ext.vt.edu/pubs/plantdiseasefs/450-603/450-603.html   Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm   spot anthracnose Elsinoe corni   http://www.ext.vt.edu/pubs/plantdiseasefs/450-611/450-611.html   virus       Corylus filbert   eastern filbert blight Anisogramma anomala   http://plantclinic.cornell.edu/FactSheets/easternfilbertblight/easternfilbertblight.htm Cosmos Mexican aster   Botrytis blight Botrytis cinerea gray fuzzy mold http://www.caes.state.ct.us/PlantPestHandbookFiles/pphC/pphcosm.htm   Phomopsis stem canker Phomopsis sp.   http://www.caes.state.ct.us/PlantPestHandbookFiles/pphC/pphcosm.htm   powdery mildew Erysiphe cichoracearum powdery white growth of fungus on plant surface http://www.ext.vt.edu/pubs/plantdiseasefs/450-603/450-603.html   white smut Entyloma calendulae   http://www.caes.state.ct.us/PlantPestHandbookFiles/pphC/pphcosm.htm Cotinus smoketree   anthracnose     http://www.ext.vt.edu/pubs/plantdiseasefs/450-604/450-604.html   Verticillium wilt Verticillium dahliae   http://www.ext.vt.edu/pubs/plantdiseasefs/450-619/450-619.html Cotoneaster     Phyllosticta leafspot Phyllosticta cotoneastri       Phytophthora root rot Phytophthora parasitica   http://www.ext.vt.edu/pubs/plantdiseasefs/450-615/450-615.html   web blight Rhizoctonia solani   http://www.westernfarmservice.com/newsletters/turf/rhizoctonia.pdf Crassula jade plant   oedema     http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/crassula.html   Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm Crataegus hawthorn   cedar-quince rust Gymnosporangium clavipes   http://ohioline.osu.edu/hyg-fact/3000/3055.html   Cercospora leafspot Cercospora sp.   http://www.agweb.okstate.edu/pearl/plantdiseases/f-7634.html   Entomosporium leafspot Entomosporium mespili   http://www.ext.vt.edu/pubs/plantdiseasefs/450-609/450-609.html   wood decay     http://www.forestpathology.org/decay.html Cryptomeria Japanese cedar   needle blight Phomopsis sp., Phyllosticta sp.   http://www.ext.vt.edu/pubs/plantdiseasefs/450-601/450-601.html   Phytophthora root rot Phytophthora sp.   http://www.ext.vt.edu/pubs/plantdiseasefs/450-615/450-615.html Cucurbita gourd   damping-off Pythium sp.   http://floriculture.osu.edu/archive/feb00/dmpoff.html   Fusarium fruit rot Fusarium sp.   http://www.apsnet.org/online/feature/pumpkin/fusrot.html Cupressus cypress   Botryosphaeria dieback Botryosphaeria sp.   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/bot_cank.html   Kabatina dieback Kabatina juniperi   http://www.ext.vt.edu/pubs/plantdiseasefs/450-601/450-601.html   Pestalotiopsis canker, tipblight Pestalotiopsis sp.   http://www.ipm.uiuc.edu/publications/rpds/rpd636/rpd636.html   Phyllosticta tip blight Phyllosticta sp.       Phytophthora root rot Phytophthora cinnamomi   http://www.ext.vt.edu/pubs/plantdiseasefs/450-615/450-615.html   Seiridium canker Seiridium cardinale   http://www.plant.uga.edu/Extension/fungi/Seiridium.html Cyclamen     Fusarium wilt Fusarium oxysporum   http://www.agnr.umd.edu/users/hgic/diagn/flow/wilt_disease.html Cymbidium orchid   virus       Cynodon bermudagrass   bermudagrass decline Gaeumannomyces graminis       Bipolaris leafspot & crown rot Bipolaris cynodontis   http://www.ianr.unl.edu/pubs/plantdisease/g925.htm   Helminthosporim crown rot Exserohilum rostratum   http://www.ianr.unl.edu/pubs/plantdisease/g925.htm   leaf blotch Bipolaris cynodontis   http://www.ianr.unl.edu/pubs/plantdisease/g925.htm   nematodes     http://creatures.ifas.ufl.edu/nematode/lance_nematode.htm   smut Ustilago cynodonis   http://www.ext.vt.edu/pubs/pmg/hga5.pdf   spring dead spot Gaeumannomyces graminis     D Genus Common Name Diagnosis Pathogen Diagnostic Characteristics Factsheet dahlia     crown gall Agrobacterium tumefaciens rough galls on roots or near soil line http://www.aces.edu/department/extcomm/publications/anr/anr-944/anr-944.html Daphne     anthracnose     http://www.ext.vt.edu/pubs/plantdiseasefs/450-604/450-604.html   Phytophthora root & stem rot Phytophthora parasitica   http://www.ext.vt.edu/pubs/plantdiseasefs/450-615/450-615.html Davidia involucrata dove tree   Phomopsis dieback Phomopsis sp.   http://www.ipm.uiuc.edu/publications/rpds/rpd636/rpd636.html Delosperma ice plant   Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm Dendranthema chrysanthemum   bacterial leafspot Pseudomonas cichorii   http://www.umass.edu/umext/programs/agro/floriculture/floral_facts/mumbac.html   Botrytis gray mold Botrytis cinerea gray fuzzy mold http://plantclinic.cornell.edu/FactSheets/botrytis/botrytis_blight.htm   Phytophthora root rot Phytophthora sp.   http://www.yoder.com/grower/pot/insect/disease_control.asp   Pythium root rot Pythium sp.   http://www.yoder.com/grower/pot/insect/disease_control.asp   Rhizoctonia root rot Rhizoctonia solani   http://www.yoder.com/grower/pot/insect/disease_control.asp   Verticillium wilt Verticillium dahliae   http://www.ext.vt.edu/pubs/plantdiseasefs/450-619/450-619.html   Pythium stem and root rot Pythium sp.   http://www.yoder.com/grower/pot/insect/disease_control.asp Dianthus carnation, pinks   Fusarium stem rot Fusarium sp.   http://hortipm.tamu.edu/pestprofiles/disease/fusrot/fusrot.html   Alternaria leafspot Alternaria sp.   http://www.westernfarmservice.com/newsletters/turf/alternaria.pdf   Fusarium stem rot Fusarium sp.   http://www.ipm.ucdavis.edu/PMG/r280110611.html   Rhizoctonia stem rot Rhizoctonia solani   http://www.ipm.ucdavis.edu/PMG/r280110611.html   rust Puccinia arenariae   http://www.ipm.ucdavis.edu/PMG/r280110611.html   Alternaria leafspot Alternaria sp.   http://www.westernfarmservice.com/newsletters/turf/alternaria.pdf   Fusarium stem rot Fusarium sp.   http://hortipm.tamu.edu/pestprofiles/disease/fusrot/fusrot.html   rust Puccinia arenariae   http://www.ipm.ucdavis.edu/PMG/r280110611.html Digitalis foxglove   black root rot Thielaviopsis basicola   http://www.agnr.umd.edu/users/hgic/diagn/flow/root_bulb_rot.html   Fusarium root rot Fusarium sp.   http://cufan.clemson.edu/pestmgmtguide/documents/ANNUALS%20AND%20PERBOTRYTIS,%20FUSARIUM,%20SCLEROTINIA.htm   Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm Dracaena     Pythium root rot Pythim sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm E Genus Common Name Diagnosis Pathogen Diagnostic Characteristics Factsheet Echinacea coneflower   aster yellows     http://www.agric.gov.ab.ca/agdex/600/30000001.html   foliar nematodes Aphelenchoides ritzemabosi   http://www.agnr.umd.edu/users/hgic/diagn/flow/foliar_nematodes.html   Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm   virus       Elaeagnus autumn olive, Russian olive   Phytophthora root rot Phytophthora sp.   http://www.ext.vt.edu/pubs/plantdiseasefs/450-615/450-615.html Epiphyllum cereus   oedema     http://plantclinic.cornell.edu/FactSheets/oedema/oedema.htm Epipremnum pthos   Phytophthora stem rot Phytophthora sp.     Erica heather   Phytophthora root rot Phytophthora sp.   http://www.ext.vt.edu/pubs/plantdiseasefs/450-615/450-615.html Eucalyptus     oedema     http://plantclinic.cornell.edu/FactSheets/oedema/oedema.htm   Pythium root rot Pythium sp.   http://aesop.rutgers.edu/~floriculture/publications/AGPYTHOR.htm   anthracnose Colletotrichum gloeosporioides   http://www.westernfarmservice.com/newsletters/turf/leafspots.pdf   Botryosphaeria dieback Botryosphaeria sp.   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/bot_cank.html   crown gall Agrobacterium tumefaciens rough galls on roots or near soil line http://www.ext.vt.edu/pubs/plantdiseasefs/450-608/450-608.html   Fusarium canker Fusarium lateritum   http://www.cas.psu.edu/docs/CASDEPT/PLANT/ext/canktree.html   oedema     http://plantclinic.cornell.edu/FactSheets/oedema/oedema.htm   Phomopsis dieback Phomopsis sp.       Phytophthora root rot Phytophthora sp.   http://www.ext.vt.edu/pubs/plantdiseasefs/450-615/450-615.html   powdery mildew Microsphaera euonymi-japonici powdery white growth of fungus on plant surface http://www.ext.vt.edu/pubs/plantdiseasefs/450-603/450-603.html Euphorbia     anthracnose Colletotrichum sp.       Botryosphaeria canker Botryosphaeria sp.   https://www.rce.rutgers.edu/pubs/pdfs/fs401.pdf Euphorbia pulcherima poinsettia   bacterial blight Curtobacterium flaccumfaciens       bacterial leafspot     http://www.agnr.umd.edu/users/hgic/diagn/flow/bacterial_spots.html   Botrytis blight Botrytis cinerea gray fuzzy mold http://plantclinic.cornell.edu/FactSheets/botrytis/botrytis_blight.htm   Pythium root & stem rot Pythium sp.