Host Plants - Westcott's Plant Disease - page 496

KS, MI, NE, ND, OH; Stagonospora
apocyni, IL, IN, IA, NY, WI, VA.
R OT ,Root.Phymatotrichum omnivorum,TX.
R UST . Puccinia seymouriana (0, I), IL, IN, KS,
NE, NJ, NY, OK, SD; P. smilacis (0, I), IL,
KS.

D AMPING -O FF . Colletotrichum acutatum and
Fusarium oxysporum, GA.
L EAF S POT . Cristulariella pyramidalis,FL;
Phyllosticta cornicola,PAtoVA,KS,TN;
Ascochyta cornicola, NC, PA; Cercospora
cornicola,NCtoFL;Septoria cornicola,NY
to GA, IA; Colletotrichum gloeosporioides,
NY.
M ISTLETOE . Dogwood, Dwarf, Bunchberry (Cornus

canadensis)

Phoradendron serotinum

(flavescens), FL.
N EMATODE , Dagger. Xiphinema americanum.
N EMATODE , Lance. Hoplolaimus uniformis, RI.
N EMATODE , Sting. Belonolaimus longicaudatus,
FL.
N ONPARASITIC . Scorch. Water deficiency, fre-
quent in Southeast.
P OWDERY M ILDEW . Microsphaera alni,MAto
NC, IL, WI; M. pulchra, CT, SC;
Phyllactinia corylea, general.
R OT , Root. Armillaria mellea, NY; Clitocybe
tabescens, FL, GA; Phymatotrichum
omnivorum, TX; Corticium galactinum,
VA; Pythium sp.
R OT , Wood. Daedalea confragosa, MD, NC, PA,
TN, VA, WV; Daldinia vernicosa, MD;
Lenzites betulina, NC;

L EAF S POT . Ceratobasidium anceps, rot, NH;
Discohainesia oenotherae, also stem spot,
ME, NH; Phyllosticta sp., NY; Ramularia
sp., NY; Septoria canadensis, AK, ME,
WA; Glomerularia corni, ME to WI, OR.
P OWDERY M ILDEW . Phyllactinia corylea, WA.
R UST . Puccinia porphyrogenita (III), ME to AK,
WA.

Dogwood, Flowering (Cornus florida)

A NTHRACNOSE . Colletotrichum gloeosporioides,
TX; Discula sp., ID, OR, Pacific NW, MD;
D. destructive, CT, GA, NC, TN.
B ACTERIAL

Polyporus spp.;

Crown Gall. Agrobacterium Poria spp., MD, PA.

S POT A NTHRACNOSE . Elsino¨ corni, DE, FL, GA,
LA, MD, NC, SC, VA.
V IRUS . Tobacco Ring Spot, MD. Witches'
Broom Disease, NJ; Dogwood Mosaic, SC.
W ILT . Verticillium sp., MA.
The most serious dogwood disease in the East
is crown or bleeding canker, which attacks trees
after transplanting or injury. In a wet season spot
anthracnose badly disfigures leaves, twigs,
berries. In wet weather Botrytis blight is conspic-
uous as flowers fade and petals rot onto leaves.

tumefaciens,MO.
B ACTERIAL Leaf Blight. Pseudomonas syringae,
TN.
B LACK M ILDEW . Dimerosporium pulchrum and
Meliola nidulans, Southeast.
B LIGHT , Flower and Leaf. Botrytis cinerea, MD,
MA, NJ, NY, probably general in wet springs.
B LIGHT , Foliar. Phytophthora parasitica, FL;
P. sp., TN.
B LIGHT , Thread. Pellicularia koleroga, LA.
B LIGHT , Twig, Fruit Spot. Colletotrichum
acutatum, CT, FL.
C ANKER , Crown; Bleeding; Collar Rot.
Phytophthora cactorum, MD, MA, NJ,
NY, WA.
C ANKER ;D IEBACK . Botryosphaeria ribis, PA;
Cytospora sp., NJ; Cryptostictis, NY;
Sphaeropsis sp.
C ANKER , Felt Fungus. Septobasidium spp., VA to
FL, LA; Cryptodiaporthe corni Anamorph,
Myxosporium nitidum, ND.

Dogwood, Pacific (Cornus nuttalli)

C ANKER , Bleeding; Collar Rot. Phytophthora
cactorum, WA.
C ANKER , Trunk. Nectria galligena, OR, WA.
P OWDERY M ILDEW . Phyllactinia corylea, general.
R OT , Root. Armillaria mellea, WA; Heart,
Fomes igniarius, OR.