Biology Reference
In-Depth Information
N EMATODE , Lesion. Pratylenchus pratensis;
P. scribneri.
N ONPARASITIC . Cattleya Dry Sepal. Industrial
fumes.
R OT , Black; Leaf and Heart. Phytophthora
cactorum, P. phaseoli, FL; Pythium
ultimum, serious on Cattleyas ; P. splendens.
R OT ,Dry.Nectria bulbicola, secondary.
R OT , Root. Rhizoctonia solani; Soft, Fusarium
moniliforme, CA.
R OT , Stem; Southern Blight. Sclerotium rolfsii.
R UST . Uredo behnickiana (II), FL, NJ, NY;
U. epidendri (II) FL; U. guacae (II), FL;
U. nigropuncta (II), FL; Sphenospora
kevorkianii,FL;S. mera,FL;S. saphena,FL.
S NOW M OLD . Ptychogaster sp. Potting fiber
mold.
S OOTY M OLD . Capnodium citri.
V IRUS . Cymbidium Mosaic, CA, HI; Orchid
Fleck; Mild Cattleya Color-Break; Severe
Cattleya Color-Break; Cattleya Blossom
Brown Necrotic Streak; Odontoglossum
Ring Spot, HI; Oncidium Ring Spot;
Tomato Spotted Wilt, HI; Vanda Ring
Spot; Spiranthes Mosaic,MD;Odontoglos-
sum Ringspot, China, Japan, Taiwan; Impa-
tiens Necrotic Spot Virus, FL.
W ILT . Fusarium oxysporum f. sp.
Orchids (Dendrobium)
B LIGHT , Flower and Leaf; Rot, Root. Fusarium
proliferatum, F. solani, F. oxysporum, F.
subglutinans, HI.
Orchids (Imported Species)
A NTHRACNOSE ; Leaf and Stem Spot.
Colletotrichum cinctum and
C. gloeosporioides ( Glomerella cincta and
G. cingulata ), general; Gloeosporium affine,
FL; G. cattleyae, VA.
B ACTERIAL Brown Rot.
Erwinia cypripedii;
Burkholderia gladioli.
B ACTERIAL Brown Spot. Pseudomonas cattleyae,
common on Cattleya , severe on Phalaenopsis .
B ACTERIAL Leaf Scorch and Pseudobulb Rot.
Unidentified.
B ACTERIAL Soft Rot. Erwinia carotovora, seri-
ous on Cattleya and other general,
E. chrysanthemi, FL; Burkholderia gladioli
(also leaf spot), HI; Dickeya chrysanthemi,
FL.
B ACTERIAL Water Soaked Leaves. Dickey
chrysanthemi, Erwinia chrysanthemi, FL.
B LIGHT , Petal. Botrytis cinerea ( Sclerotinia
fuckeliana ), spotting common on older
flowers; Glomerella sp., black spot of Vanda
orchids.
B LIGHT , Southern. Sclerotium rolfsii. FL.
B LOTCH , Sooty. Gloeodes pomigena.
D ODDER . Cuscuta gronovii; Laurel-Dodder.
Cassytha filiformis.
F LYSPECK . Microthyriella rubi.
L EAF R OT . Sclerotinia rolfsii, FL.
L EAF S POT . Cercospora epipactidis;
C. cypripedii; C. peristeriae; C. dendrobii;
C. odontoglossi; Chaetodiplodia sp.;
Phyllostictina pyriformis; Physalospora
spp., also stem decay; Diplodia
laeliocattleyae; Phyllosticta spp.;
Selenophoma spp.; Septoria
selenophomoides; Volutella albido-pila.
cattleyae,
CA, FL, OH; F. moniliforme.
When dividing plants use a “hot knife” or
disinfest between cuts; keep new orchids iso-
lated; sterilize or fumigate the potting medium
and disinfest the bench. Destroy plants seriously
affected by rusts.
Orchids (Native Species)
L EAF S POT . Cercospora cypripedii, NY, WI;
Fusicladium aplectri, DE; Mycosphaerella
cypripedii, NY; Phyllosticta aplectri, DE;
Septoria calypsonis, MI.
R UST . Puccinia praegracilis ( Aecidium
graebnerianum ) (I), AK, CA, MT, OR, WA;
P. cypripedii (II, III), IN, IA, MI, NJ, VA, WI;
Uredo goodyerae
(II, III), CA, CO, NM,
OR, WA.
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