Host Plants - Westcott's Plant Disease - page 642

Stillingia (Queens Delight) Stone Plant (Lithops)

D ODDER . Cuscuta sp., OK.
L EAF S POT . Cercospora stillingiae, TX.
R OT , Root. Phymatotrichum omnivorum, TX.
R UST . Uromyces graminicola (0, I), OK; II, III
on Panicum .

R OT . Fusarium oxysporum,ID.

Stranvaesia

B ACTERIAL Fire Blight. Erwinia amylovora, NJ.
R OT , Root. Clitocybe tabescens, FL.

Stock (Matthiola)

Strawberry (Fragaria)

A NTHRACNOSE ; Leaf and Stem Spot.

Colletotrichum gloeosporioides, TX.
B ACTERIAL Black Rot. Xanthomonas incanae,
CA, TN.
B LIGHT ,GrayMold.Botrytis cinerea, AK, TX.
C LUB R OOT . Plasmodiophora brassicae, NJ.
D AMPING -O FF . Pythium spp.; Rhizoctonia
solani, cosmopolitan.
D OWNY M ILDEW . Peronospora parasitica, CA, IL.
L EAF

A NTHRACNOSE ; Crown Rot. Colletotrichum
acutatum, CT; C. fragariae, FL, LA;
Gloeosporium sp., MD.
A NTHRACNOSE , Fruit. Colletotrichum
gloeosporioides, FL, OH; C. acutatum, NY.
B ACTERIAL Angular Leaf Spot. Xanthomonas
fragariae, FL, KY, MN, WI.
B ACTERIAL Blossom Blight. Xanthomonas
campestris var. fragariae, CA; Pseudomo-
nas marginalis, CA.
B ACTERIAL , Phytoplasma. Aster Yellows, straw-
berry green petal; Lethal Disease Decline or
Peach Western X Disease. WA, OR; Clover
Proliferation, CA, FL, MD; Clover Yellow
Edge and STRAWB2, MD.
B ACTERIAL Soft Rot. Erwinia carotovora,MA.
B LIGHT ,

S POT . Alternaria raphani, CA;

Myrothecium roridum, TX.
N EMATODE . Naccobus batatiformis.
N EMATODE , Root Knot. Meloidogyne sp., TX.
R OT , Crown; Wilt.

Sclerotinia sclerotiorum,

CA, MI, PA.
R OT , Root. Fusarium avenaceum, DE, NJ;
Phymatotrichum omnivorum, TX;

Phytophthora megasperma, CA;

P. cryptogea, stem rot, CA.
V IRUS . TurnipMosaic; Cauliflower Mosaic; Beet
Curly Top,CA;Tomato Spotted Wilt,TX.
W ILT . Fusarium oxysporum f. sp. mathioli, AZ,
CA; Verticillium alboatrum, CA, NY.
Mosaic causes flower-breaking as well as mot-
tling of foliage. Verticillium wilt is prevalent in
cut-flower producing areas of California.

Blossom. Cladosporium

cladosporioides, CA.
B LIGHT , Gray Mold. Botrytis cinerea, general on
fruit.
B LIGHT , Leaf. Dendrophoma obscurans, angular
leaf spot, MA, to FL, MI, MN, NE, OR, TX;
Phomopsis obscurans, CT.
B LIGHT , Southern. Sclerotium rolfsii, AL, FL,
NC, TX.
B ROOMRAPE . Orobanche sp., WA.
D OWNY M ILDEW . Peronospora fragariae, IA.
G ALL , Leaf. Synchytrium aureum, on native
spp., WI; S. fragariae, root gall, CA, WA.
L EAF B LOTCH . Gnomonia fructicola, also fruit
rot; G. comari, CA.
L EAF S CORCH . Diplocarpon earliana, general.
L EAF S POT . Cercospora fragariae, LA;
C. vexans, CA, NY, WI; Gloeosporium sp.,

Stokesia (Stokes-Aster)

B LIGHT , Head. Botrytis cinerea, NY.
L EAF S POT . Ascochyta sp., IA, PA.
P OWDERY M ILDEW . Golovinomyces

cichoracearum, MD.
V IRUS . Mosaic. Unidentified, IA; Bidens Mottle,
FL.