Host Plants - Westcott's Plant Disease - page 559

C ANKER . Hendersonula toruloidea, WA;
Fusicoccum sp., western North America.
C ANKER , Trunk. Phytophthora cactorum, CA,
WA.
G ALL , Leaf; Red Leaf Spot. Exobasidium
vaccinii, CA, OR, TX, WA.
L EAF S POT . Ascochyta hanseni, CA;
Cryptostictis arbuti, CA, OR;
Didymosporium arbuticola, OR;
Mycosphaerella arbuticola, CA, OR, WA;
Phyllosticta fimbriata, OR.
L EAF S POT , Tar. Rhytisma arbuti, CO, OR, TX,
WA.
R OT , Heart. Fomes subroseus, OR.
R OT , Root. Phymatotrichum omnivorum,TX.
R OT , Wood. Lenzites saepiaria, OR, TX;
Polyporus spp., OR, TX; Trametes sepium,
CA.
R UST . Puccinastrum sparsum (II, III), CA, OR,
WA.
S POT A NTHRACNOSE . Elsino¨ mattirolianum, CA.

magnoliae, VA; Heterosporium magnoliae,
FL, NC, TX; Micropeltis alabamensis, AL;
cookei, NY to Gulf states, CA; P. magnoliae,
large leaf spot, NY to Gulf states, CA;
Septoria magnoliae, SC to FL, TX.
L EAF S POT ; Algal; Green Scurf; “Red Rust”.
Cephaleuros virescens, general.
N EMATODE , Burrowing. Radopholus similis, FL.
N EMATODE , Citrus. Tylenchulus semipenetrans,
FL.
N EMATODE , Lance. Hoplolaimus uniformis, RI.
N EMATODE , Lesion. Pratylenchus pratensis.
N EMATODE , Root Knot. Meloidogyne sp.
N EMATODE , Sting. Belonolaimus longicaudatus,
FL.
P ARASITIC L ICHEN . Strigula elegans and

S. complanata, Southern U.S., LA.
R OT , Flower. Ciborinia ( Sclerotinia ) gracilipes,
MD.
R OT , Heart. Fomes fasciatus; F. geotropus.
R OT , Root. Phymatotrichum omnivorum, TX;
Clitocybe tabescens, GA.
R OT , Wood. Daldinia concentrica, cosmopoli-
tan; Polyporus spp.; Poria spp., Stereum spp.
S POT A NTHRACNOSE . Elsino¨ magnoliae, FL, GA,
LA, MS.
W ILT . Verticillium albo-atrum, CA, IN.
The many leaf spots need not be alarming;
they seldom cause premature defoliation. In the
Gulf states lichens appear as small round gray
spots on leaves, and the parasitic alga
Cephaleuros often forms a velvety coating with
hairlike outgrowths.

Magnolia

B ACTERIAL Leaf Spot. Pseudomonas syringae,
IL; P. cichorii, AL.
B LACK M ILDEW . Dimerosporium magnoliae,
TX; Irene araliae, MS; Meliola
amphitricha, Gulf states; M. magnoliae;
Trichodothis comata, South.
B LIGHT , Seedling. Rhizoctonia solani, NJ.
B LIGHT , Thread. Pellicularia solani, NJ.
C ANKER , Felt Fungus. Septobasidium langoisii,
S. tenui, S. leprieurii, Gulf states.
C ANKER ; Twig Blight. Nectria sp., WV;
N. magnoliae, NJ, TN, WV; Tubercularia
sp., MI.
L EAF S POT . Alternaria tenuis, TX;
Cladosporium fasciculatum, GA to TX;
Cercospora magnoliae ( Mycosphaerella
milleri ), FL, NJ, NC, SC, WV; Cristulariella
pyramidalis; Colletotrichum sp., FL, GA,
SC; Coniothyrium sp., TX; C. olivaceum,
TX; Epicoccum nigrum, TX; Exophoma
magnoliae, FL, TX; Glomerella cingulata,
AL, FL, GA, LA, MS, SC, TX; Hendersonia

Mahogany (Swietenia)

B LIGHT , Twig, Stem. Phomopsis sp., OR.
L EAF S POT . Pestalotia swieteniae, FL;

Phyllachora swieteniae, FL.

Mahonia (Oregon-Grape)

C ANKER ; Leaf Blotch. Leptosphaeria

berberidis, ID, MD.
L EAF S POT . Cercospora sp., LA; Gloeosporium
berberidis, WA; Phomopsis sp., secondary;