Host Plants - Westcott's Plant Disease - page 645

white root, VA; Phymatotrichum P OWDERY M ILDEW . Golovinomyces

cichoracearum, general, CA.
R OT , Charcoal. Macrophomina phaseolina, CA,
IL, MD, MN, ND, SD.
R OT , Head. Rhizopus oryzae, CA, NM; Phoma
macdonaldii, premature ripening, ND.
R OT , Root. Armillaria mellea, OR;
Helicobasidium purpureum, violet root,
TX; Phymatotrichum omnivorum, TX;
Pythium debaryanum; Rhizoctonia solani,
IL, MD, NE, NY, WI.
R OT , Stem. Phytophthora cryptogea, CA;
Septosphaeria lindquistii, black stem, MN,
ND; Sclerotinia sclerotiorum, widespread.
R UST . Puccinia helianthi, (0, I, II, III), general,
CA, IL, MN, NE, ND; P. massalis, NM, TX;
P. canaliculata, GA, KS; P. xanthii,ND;
Coleosporium helianthi (II, III), NY to FL,
LA and OK; II, III on pine; C. madiae,CA;
Uromyces junci (0, I), CA, KS, NE, ND, OK,
SD, WY; U. silphii (0, I), IL, MO, NY, TN, WI.
S MUT , Leaf. Entyloma polysporum CA, MT.
V IRUS . Bromegrass Mosaic General, IA, SD;
Sunflower Mosaic, IN, TX; Cucumber
Mosaic, FL, MD; Bidens Mottle, FL.
W HITE R UST . Albugo tragopogonis, CO, IL, KS,
MO, WI.
W ILT . Fusarium oxysporum f. sp. apii, SC;
F. sporotrichioides,MN;Verticillium albo-
atrum; V. dahliae, CA; Sclerotinia
sclerotiorum ¼ Whetzelinia sclerotiorum,
CA.

omnivorum, TX.
R OT , Wood. Polyporus spp.; Poria punctata,
MI; Schizophyllum commune, cosmopoli-
tan; Steccherinum ochraceum, PA.
R UST . Pileolaria effusa (0, III), AZ;
P. patzcuarensis (0, I, II, III), CO, NM, OK.
W ILT . Fusarium oxysporum f. sp. rhois,
CT, KS, VA; Verticillium alboatrum, IL,
IA, MA, MN.

Sunflower (Helianthus)

A NTHRACNOSE . Colletotrichum acutatum, CA.
B ACTERIAL Leaf Spot. Pseudomonas syringae
pv. helianthi; P. syringae pv. tagetis, WI.
B ACTERIAL , MLO. California Aster Yellows,
CA.
B ACTERIAL Stem Rot. Erwinia carotovora, ND.
B ACTERIAL Wilt and Apical Chlorosis. Pseudo-
monas solanacearum, FL; P. syringae pv.
tagetis, KS, MN, ND, WI; Erwinia
carotovora pv. carotovora, IN.
B LACK K NOT , Black Patch. Gibberidea
heliopsidis, GA, IL, MS, MO, NC, VA.
B LIGHT , Gray Mold; Bud Rot. Botrytis cinerea,
CA, OR.
B LIGHT , Petal. Itersonilia perplexans, FL.
B LIGHT , Seedling. Alternaria helianthi, MN;
Diaporthe helianthi, TX.
B LIGHT , Southern, Sclerotium rolfsii, LA, TX.
C ANKER , Stem. Diaporthe helianthi, OH, TX;
Phomopsis helianthi, IL.
D ODDER . Cuscuta sp., OK, TX, WA.
D OWNY M ILDEW . Plasmopara halstedii,NYto
MD, KS, MT, TX.
G ALL , Basal. Plasmopara halstedii, MN, ND.
L EAF S POT . Ascochyta compositarum, WI;
Cercospora helianthi, IL, KS, MO, OH, TX,
WI; C. pachypus, AL, KS, OK, TX;
Colletotrichum helianthi, WI; Septoria
helianthi,

Sunrose (Helianthemum)

L EAF S POT . Cylindrosporium eminens, TX, WI;
Septoria chamaecisti, WA.
R OT , Root. Phymatotrichum omnivorum,TX.

Swedish Ivy (Plectranthus australis)

general; Alternaria zinniae;

Alternaria helianthi, MN, OH.
N EMATODE ,

N ONPARASITIC . Brown Leaf Spot. Boron

Leaf Gall. Tylenchus deficiency.

V IRUS . Alfalfa Mosaic, NY; Tomato Spotted
Wilt, PA; and TSW-Impatiens Serotype,
GA, FL.

balsamophilus, WA.
N EMATODE , Root Knot. Meloidogyne sp., AL, FL,
TX, WV.