Biology Reference
In-Depth Information
TX; Sphaeropsis hedericola, NY, WV;
Macrophoma sp., TX.
M
OLD
, Leaf. Cladosporium brunneolum, CA.
N
ONPARASITIC
.
Italian Dandelion (Cichorium intybus)
B
ACTERIAL
, Leaf Spot. Pseudomonas syringae.
Winter
Injury.
Sunburn,
Freezing.
P
OWDERY
M
ILDEW
. Golovinomyces
cichoracearum, OK; Oidium araliacearum,
CA.
R
OT
, Root. Phytophthora palmivora, CA; Rhi-
zoctonia solani, CT; Phymatotrichum
omnivorum, TX.
S
OOTY
M
OLD
. Common under trees, on insect
exudate.
S
POT
A
NTHRACNOSE
; Ivy Scab. Sphaceloma
hederae, CA, NC, VA.
Leaf spots are not often important in the
garden but browning of foliage from winter
injury is conspicuous in early spring. English
ivy used as a ground cover is often black, with
sooty mold growing in honeydew dropped
from aphids in trees overhead. Dodder some-
times gets a strangle hold and is difficult to
eradicate.
Itchgrass (Rottobellia)
B
LIGHT
. Curvularia cymbopogonis, LA.
R
OT
, Root. Pythium arrhenomanes, LA.
Ivesia
R
UST
. Phragmidium horkeliae (III), UT;
P. ivesia, CA; P. jonesii, NV, OR, UT.
Ivy, Boston (Parthenocissus
tricuspidata)
C
ANKER
;D
IEBACK
. Cladosporium herbarum,
IN, NJ, OH, PA.
D
OWNY
M
ILDEW
. Plasmopara viticola, NJ, TX.
L
EAF
S
POT
. Cercospora amelopsidis, MS;
C. pustulata, TX; Guignardia bidwellii
f. sp. parthenocissi widespread; Phloeospora
ampelopsidis,IA;Sphaeropsis hedericola,
NJ.
N
EMATODE
, Dagger. Xiphinema index, CA.
P
OWDERY
M
ILDEW
. Uncinula necator, TX.
R
OT
, Root. Phymatotrichum omnivorum, TX.
R
OT
, Stem. Pellicularia filamentosa, CT.
The Guignardia leaf spot
Ixia
R
OT
, Corm. Fusarium oxysporum f. sp. gladioli;
Sclerotium sp.
V
IRUS
. Iris Mosaic, OR, WA.
is common and
Ixora
disfiguring.
N
EMATODE
, Burrowing. Radopholus similis, FL.
N
EMATODE
, Root Knot. Meloidogyne sp., FL.
R
OT
, Root. Clitocybe tabescens, FL.
Ivy, English (Hedera helix)
A
NTHRACNOSE
. Amerosporium (
Colletotrichum
)
trichellum, MA to SC, OK, OR, TX, WA.
B
ACTERIAL
S
POT
. Xanthomonas hederae, GA,
IL, MD, NJ, NY, VA, WA.
D
ODDER
. Cuscuta sp., AZ, NJ.
L
EAF
S
POT
. Glomerella cingulata, CT, MD, NY,
TX; Phyllosticta concentrica, MA to AL,
CA, NE, TX. WA; Ramularia hedericola,
Jacaranda
R
OT
, Root. Armillaria mellea, CA; Clitocybe
tabescens,
FL;
Phymatotrichum
omnivorum, TX.
