Biology Reference
In-Depth Information
a dry season leaves look scorched or blotched,
turn brown, and drop from drought and heat. The
minute black fruiting bodies of the fungus distin-
guish the parasitic form from the physiogenic
disease.
R
OT
, Root. Phymatotrichum omnivorum, TX;
Thielaviopsis basicola, KS, NJ.
R
OT
, Root Complex. Fusarium acuminatum,
Verticillium dahliae
and
Pseudomonas
fluorescens, IL, WI.
V
IRUS
. Beet Curly Top, CA, IL, KS, OR, UT,
WA; Turnip Mosaic, widespread.
W
HITE
R
UST
. Albugo candida, probably general.
W
ILT
. Verticillium albo-atrum, MI, WA.
Horse-Gentian (Triosteum)
L
EAF
S
POT
. Cladosporium triostei, IL, IA,
MO, NE, WV, WI; Cylindrosporium
triostei, IL, KS, OK, WI; Cercospora
triostei, WI.
P
OWDERY
M
ILDEW
. Phyllactinia corylea, MI.
R
UST
. Aecidium triostei (0, I), MO.
Horseweed (Conyza)
R
OT
. Sclerotinia minor, NC.
V
IRUS
. Tomato Spotted Wilt, GA.
Horse Purslane (Trianthema)
Hosta (Plantain-Lily)
L
EAF
S
POT
. Gibbago trianthemae, AR.
B
ACTERIAL
, Proliferation. Rhodococcus fascians,
OR.
L
EAF
S
POT
. Alternaria sp., NY; Phyllosticta sp.,
NJ.
N
EMATODE
, L
EAF
Horse-Radish (Armoracia)
B
ACTERIAL
Crown
Gall.
Agrobacterium
tumefaciens, NJ, NY.
B
ACTERIAL
Leaf Spot. Xanthomonas campestris
pv. armoraciae, CT, IL, IA, MD, MO, SD,
VA; X. phaseoli, IL.
B
ACTERIAL
,MLO.R
OOT
, Brittle, disease, vires-
cence. Spiroplasma citri, CA, IL, MD.
B
ACTERIAL
Soft Rot. Erwinia carotovora,in
stored roots, CT, NY.
C
LUB
R
OOT
. Plasmodiophora brassicae, IL.
D
OWNY
M
ILDEW
. Peronospora parasitica, AL,
IL, NJ, SD, WI.
L
EAF
S
POT
. Alternaria brassicae, CT to DE, IL,
IA; A. oleracea, CT to DE, MO, NE, TX;
Cercospora armoraciae, general;
Phyllosticta decidua, TX, WA, WI;
P. orbicula, NY; Ramularia armoraciae,
general.
N
EMATODE
, Root Knot. Meloidogyne sp., IL, MS,
OK.
P
OWDERY
M
ILDEW
. Erysiphe polygoni, CA.
R
OT
, Blue Mold. Penicillium hirsutum, IL, NJ.
R
OT
, Collar, Root. Pellicularia filamentosa, IL,
MI, NJ, NY, TX, WA.
L
ESION
.
Aphelenchoides
fragariae, IL, NY, SC.
R
OT
,Crown.Botrytis cinerea, AK, NJ; Sclero-
tium rolfsii (
S. delphinii
), CT, MD, MN, NJ,
NY.
R
OT
, Root. Rhizoctonia solani, NJ; Fusarium
solani, F. oxysporum, F. proliferatum
(Root and Crown), SC.
V
IRUS
. Hosta Virus X, IL, IN, IA, MN, HI,
Pacific Northwest; Tobravirus, Leaf
Necrosis, IL, MI, MN; Tomato Spotted
Wilt, FL; Impatiens Necrotic Spot, NY;
Arabis Mosaic, MI, MN, NE; Tobacco Rat-
tle, Canna YellowMottle, Helloborus Black
Death Disease, Nemerica Necrosis, Diascia
Yellow Mottle, Pacific Northwest.
Houstonia (Bluets)
D
OWNY
M
ILDEW
. Peronospora calotheca, IL;
P. seymourii, AL, AR, IL, IA, MS, TX.
