Notes: Common on leaves of Ilex opaca (American holly, Aquifoliaceae) on Bluff Trail near Visitor’s Center. Looked to me like some kind of ascomycete, but I’m not sure. I’ve looked through some literature on diseases of holly but haven’t run into anything promising.
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Here is a lit of holly (Ilex) diseases, maybe it will help.
BACTERIAL Blight. Clavibacter ilicis, MA.
BLACK MILDEW . Asterina (Englerulaster) orbicularis, DE to FL, TX;
A. ilicis; A. pelliculosa; Morenoella (Lembosia) ilicis, Gulf states.
BLIGHT , Flower. Botrytis cinerea, NJ.
BLIGHT , Leaf and Twig. Phytophthora ilicis, OR, WA.
BLIGHT , Thread. Pellicularia koleroga, LA; silky thread, Rhizoctonia
ramicola; web, Cylindrocladium scoparium, AL.
CANKER ; 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.
CANKER , Felt Fungus. Septobasidium spp., FL, LA, NC.
DODDER . Cuscuta compacta, FL; C. exaltata, TX.
LEAF SPOT . Cercospora ilicis, NJ and Gulf states; Gloeosporium aquifol-
li, NJ, TX, WA; Macrophoma phacediella, NJ; Microthyriella cutic-
ulosa, black spot; Phyllosticta concomitans, LA; P. terminalis, MS;
Septoria ilicifolia, NJ; Cuticularia ilicis, OR; Sclerophoma sp., OR.
LEAF SPOT . Sclerophoma sp., Kentucky on English Holly (Ilex aquifoli-
LEAF SPOT , Tar. Phacidium curtisii, MA to FL,TX; Rhytisma ilicini-
colum, VA to GA, TN; R. velatum, GA, MS, SC.
LEAF SPOT ; Twig Dieback. Cylindrocladium avesiculatum, GA.
NEMATODE , Lance. Hoplolaimus uniformis, RI.
NEMATODE , Root Knot. Meloidogyne incognita; M. incognita; M. are-
naria, NC; M. hapla; M. javanica.
NONPARASITIC . Leaf Blotch. Purplish blotches associated with soil defi-
ciencies and drought or winter injury.
Chlorosis. Mineral deficiency from excess of lime.
Spine Injury; Copper Spray Injury; Boron Deficiency.
POWDERY MILDEW . Microsphaera alni, AL, FL, IL, NC; Phyllactinia
ROT , Leaf. Rhizoctonia solani, of cuttings.
ROT , Root. Clitocybe tabescens, FL; Phymatotrichum omnivorum, TX;
Corticium galactinum, white root, MD.
ROT , Wood. Daldinia vernicosa, MD; Daedalea confragosa, MD; Poly-
porus spp.; Stereum spp., MD; Ustulina deusta, MD; Poria spp.; Pleu-
rotus ostreatus, MD.
RUST . Chrysomyxa ilicina (II, III), NC, TN, WV, 0, I unknown.
SOOTY MOLD . Capnodium elongatum, Gulf states; Fumago vagans, OR,
SPOT ANTHRACNOSE . Elsinoë ilicis, PA, on Chinese 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.
Created: 2014-09-12 08:00:32 PDT (-0700)
Last modified: 2014-09-12 08:00:36 PDT (-0700)
Viewed: 47 times, last viewed: 2017-08-25 07:45:43 PDT (-0700)