Host Plants - Westcott's Plant Disease - page 663

B LIGHT , Southern. Sclerotium rolfsii, VA to FL,
CA, CT, NY, TX, VT.
D OWNY M ILDEW . Bremiella megasperma, FL,
IL, IA, MN, NJ.
G ALL , Leaf. Synchytrium aureum, NY, WI.
L EAF S POT . Alternaria violae, CT to GA, TX,
WI; Ascochyta violicola, AK; A. violae, IN,
IA, PA, WI; Centrospora acerina, AK, CA;
Cercospora granuliformis, ME to AL, OK,
SD; C. violae, MA to FL, ND, TX;
Cryptostictis violae, IL; Cylindrosporium
violae, MT; Heterosporium sp., AK;
Marssonina violae, MA to SC, IA, MN;
Phyllosticta violae, MA to FL, CA, KS,
MN; P. nigrescens, CA; Ramularia lactea,
AK, CO, MS, MT; R. agrestis, NE, OR;
Septoria violae, northeastern and North cen-
tral states to AK, FL, KS, LA; Ciborinia
violae.
N EMATODE , Lesion. Pratylenchus pratensis.
N EMATODE , Root Knot. Meloidogyne spp., FL to
CA, occasional in North.
P OWDERY M ILDEW . Sphaerotheca macularis,
CA, CO, ND, OR, WI, WY.
R OT , Root. Fusarium oxysporum f. sp.
aurantiacum, FL, MS, OH; Helicobasidium
purpureum, TX; Phymatotrichum
omnivorum, TX; Rhizoctonia solani, FL,
IL, MN, MS, NY; Thielaviopsis basicola,
CT to MS, KS, MA, OH.
R OT , Wet; Gray Mold. Botrytis cinerea, AK,
MD, OH.
R UST . Puccinia violae (0, I, II, III), general;
P. effusa (III), CA; P. ellisiana (0, I),
northeastern and North central states to AL,
NM, WY; II, III on Andropogon ;
P. fergussoni (III), AK, CO, MT, UT;
Uromyces andropogonis, (0, I), MS, NJ,
NC, PA, TN, WV; II, III on Andropogon .
S MUT , Leaf and Stem. Urocystis violae, AK, CA,
MN, TX, UT.
S OOTY M OLD . Scorias spongiosa, ME.
S POT A NTHRACNOSE ; Scab. Sphaceloma violae,
ME to FL, KS, LA, OH, WA.
V IRUS . Beet Curly Top, TX.
Spot anthracnose is an important violet dis-
ease in many gardens with disfiguring scabby
lesions on stems and leaves.

Vipers-Bugloss (Echium)

L EAF S POT . Cercospora echii; Stemphylium sp.,
NY.
R OT , Root. Rosellinia sp., CA.
R OT , Stem. Sclerotinia sclerotiorum, ND.

Virginia Creeper (Parthenocissus
quinquefolia)

B LIGHT , Thread. Pellicularia koleroga, FL.
C ANKER ;D IEBACK . Coniothyrium fuckelii, WV;
Cladosporium sp., NJ.
D OWNY M ILDEW . Plasmopara viticola, AL, IA,
ME, MN, NJ, NY, TX, WI.
L EAF S POT . Cercospora ampelopsidis, wide-
spread; C. psedericola, IL, VA; Guignardia
bidwellii f. sp. parthenocissi, general;
Phloeospora ampelopsidis, IL, IA, NE, WI.
P ARASITIC

L ICHEN . Strigula elegans and

S. complanata, LA, southern US.
P OWDERY M ILDEW . Uncinula necator, general;
CAES.
R OT , Root. Helicobasidium purpureum, TX;
Phymatotrichum omnivorum, TX.
S POT A NTHRACNOSE . Elsino¨ parthenocissi, FL,
MO, NH, PA.
The Guignardia leaf

spot is commonly

disfiguring in a wet season.

Vitex (Chaste-Tree)

L EAF S POT . Cercospora viticis, LA, TX.
R OT ,Root.Phymatotrichum omnivorum,TX.

Wahlenbergia (Southern Rockbell)

V IRUS . Tomato Spotted Wilt, GA.

Wallflower (Cheiranthus)

B ACTERIAL ,MLO.California Aster Yellows,CA.
B LIGHT , Gray Mold. Botrytis cinerea, AK, WA.