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.