Host Plants - Westcott's Plant Disease - page 534

Macrophoma phacediella, NJ;
Microthyriella cuticulosa, black spot;
Phyllosticta concomitans, LA; P. terminalis,
MS;

Hippeastrum

Amaryllis. Septoria ilicifolia, NJ; Cuticularia

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ilicis, OR; Sclerophoma sp., OR.
L EAF S POT . Sclerophoma sp., Kentucky on
English Holly ( Ilex aquifolium ).
L EAF S POT ,Tar.Phacidium curtisii, MA to FL,
TX; Rhytisma ilicinicolum, VA to GA, TN;
R. velatum, GA, MS, SC.
L EAF S POT ; Twig Dieback. Cylindrocladium
avesiculatum, GA.
N EMATODE , Lance. Hoplolaimus uniformis, RI.
N EMATODE , Root Knot. Meloidogyne incognita;
M. incognita; M. arenaria, NC; M. hapla;
M. javanica.
N ONPARASITIC . Leaf Blotch. Purplish blotches
associated with soil deficiencies and drought
or winter injury.
Chlorosis. Mineral deficiency from excess of
lime.
Spine Injury; Copper Spray Injury; Boron
Deficiency.
P OWDERY M ILDEW . Microsphaera alni, AL, FL,
IL, NC; Phyllactinia corylea, TN.
R OT , Leaf. Rhizoctonia solani, of cuttings.
R OT ,

Hoarhound (Marrubium)

G ALL , Leaf. Synchytrium marrubii, TX.
L EAF S POT . Cercospora marrubii, OK, TX.
N EMATODE , Root Knot. Meloidogyne sp., AL.

Hoary-Tick Clover (Desmodium)

R OT ,B LACK . Cylindrocladium parasiticum, FL.
V IRUS . Cowpea Mosaic, IL; Desmodium
Mosaic, FL; Desmodium Yellow Mottle,
AR.

Holly (Ilex)(Ilex opaca, American; I.
equifolium, English; I. cornuta,
Chinese; I. crenata, Japanese)

B ACTERIAL Blight. Clavibacter ilicis, MA.
B LACK M ILDEW . Asterina ( Englerulaster )
orbicularis, DE to FL, TX; A. ilicis; A.
pelliculosa; Morenoella ( Lembosia )

Root. Clitocybe tabescens, FL;

Phymatotrichum omnivorum, TX;

ilicis, Corticium galactinum, white root, MD.

R OT , Wood. Daldinia vernicosa,MD;Daedalea
confragosa, MD; Polyporus spp.; Stereum
spp., MD; Ustulina deusta, MD; Poria spp.;
Pleurotus ostreatus, MD.
R UST . Chrysomyxa ilicina (II, III), NC, TN, WV,
0, I unknown.
S OOTY M OLD . Capnodium elongatum, Gulf
states; Fumago vagans, OR, WA.
S POT A NTHRACNOSE . Elsino¨ ilicis, PA, on Chi-
nese holly.
None of these diseases is as important to the
average gardener as the holly leaf miner.
Spraying is necessary for that insect but seldom
obligatory for the various leaf spots. The most
common leaf discoloration is a purplish blotch
due to environment rather than a fungus. Proper
growing conditions and correct soil acidity are
important. Pick off occasional spotted leaves;
prune out blighted branches.

Gulf states.
B LIGHT , Flower. Botrytis cinerea, NJ.
B LIGHT , Leaf and Twig. Phytophthora ilicis, OR,
WA.
B LIGHT , Thread. Pellicularia koleroga, LA; silky
thread, Rhizoctonia ramicola; web,

Cylindrocladium scoparium, AL.
C ANKER ;D IEBACK . Boydia insculpta, secondary,
OR, WA; Diaporthe eres, secondary;
Diplodia sp., MD; Nectria coccinea;
Phomopsis sp.; Physalospora ilicis on
twigs, also leaf spot, CA, NJ, NY, NC, SC,
TX, WA, WV; Gloeosporium sp., AL.
C ANKER , Felt Fungus. Septobasidium spp., FL,
LA, NC.
D ODDER . Cuscuta compacta, FL; C. exaltata,
TX.
L EAF S POT . Cercospora ilicis, NJ and Gulf states;
Gloeosporium aquifolli, NJ, TX, WA;