Host Plants - Westcott's Plant Disease - page 638

widespread; Rhizoctonia solani,cosmopoli-
tan; Aphanomyces euteiches;

New England to Great Lakes; II, III on
Chamaedaphne ; C. ledicola (0, I), northern
U.S. from ME to WA, AK, CO; II, III on
Ledum ; wild rosemary; C. piperiana (0, I),
CA, OR; II, III on Rhododendron californicum ,
C. roanensis (0, I), NC, TN; II, III on Rhodo-
dendron catawbiense , C. weirii,TN,WVto
VT, WI, SD to WA, most Canadian Provinces;
C. arctostaphyli (0, I); III on bearberry.
R UST ; Witches' Broom. Melampsorella cerastii,
widespread.
Cytospora canker frequently kills lower
branches of ornamental spruces. There is little
control except to remove affected portions.

Caloscypha

fulgens, OR, WA.
D IEBACK , Branch. Phomopsis occulta, MI.
M ISTLETOE , White Fir Dwarf. Arceuthobium
abietinum f. sp. concoloris, MS.
M ISTLETOE ; Witches' Broom. Arceuthobium
campylopodium, Rocky Mts., NM, TX;
A. pusillum, New England, especially ME,
NH, to Great Lakes states, MN, WI;

A. vaginatum,CO.
N EEDLE C AST . Rhizosphaera kalkhoffii, north-
eastern U.S., AZ, IN, MI, MN, PA, WI;
Stigmina lautii, ND.
N EEDLE C AST ; Tar Spot. Lophodermium
filiforme, AK, CO, NY; L. piceae, New
England to Great Lakes states, Pacific North-
west; Lophodermina septata, OR;
Rhizosphaera kalkhoffii, CT, NY, VA;
Bifusella crepidiformis, MT; Cladosporium
sp., ME.
N EMATODE . Nacobbodera chitwoodi, OR;
Paratylenchus projectus; Pratylenchus
penetrans; Tylenchus marginatus.
N EMATODE , Dagger. Xiphinema americanum,
WI.
R OT , Collar. Diplodia

Spurge Caper (Euphorbia lathyris)

R OT , Root. Macrophomina phaseolina, AZ,
Rhizoctonia solani, AZ; Pythium

aphanidermatum, AZ.

Spurge, Cypress (Euphorbia
cyparissias) pinea, NJ, NY;

Sphaeropsis ellisii, NJ.
R OT , Heart. Fomes annosus,CAtoWA;F. pini,
widespread;

A NTHRACNOSE . Sphaceloma poinsettiae, FL.
L EAF S POT . Cercospora euphorbiae, TX.
R OT , Root. Phymatotrichum omnivorum, TX;
Rhizoctonia sp.
R UST . Melampsora euphorbiae (0, I, II, III), ME
to PA, IN, WI.

F. pinicola, widespread;

F. roseus; F. subroseus, wide spread;

Polyporus spp.
R OT , Root. Armillaria mellea,AZ,CO,NM,OR,
PA, UT, WA; Inonotus tomentosus;
Phymatotrichum omnivorum,TX;Sparassis
radicata, ID, MT, OR, WA; Phytophthora
cinnamomi, NC; P. dreschleri, NC;
P. cryptogea,NC;Fusarium solani,PA;
F. oxysporum,PA;F. avenaceum,PA;
Cylindrocladium canadense, M tr l,
Canada.
R OT , Root, Butt. Hyphodontia aspera, NH.
R UST , Cone. Chrysomyxa pirolata (0, I), AK,
CO, ME, MA, MI, MT, NH, NY, OR, PA,
VT; II, III on Moneses and Pyrola .
R UST , Needle. Chrysomyxa empetri (0, I), ME;
C. ledi (0, I), New England to Great Lakes; II,
III on Ledum ; C. ledi var. cassandrae (0, I),

Spurge, Flowering (Euphorbia
corollata)

L EAF S POT . Cercospora euphorbiae, KS, TX; C.
heterospora, WI; Phyllosticta sp.
M OLD , Leaf. Cercosporidium fasciculatum, IA.
P OWDERY M ILDEW . Microsphaera euphorbiae,
MD to GA, IN, WI.
R OT ,Root.Phymatotrichum omnivorum,TX.
R UST . Puccinia panici (0, I), OH to AL, MN, TX;
II, III on Panicum .