Host Plants - Westcott's Plant Disease - page 630

Sida Silphium (Compass Plant, Indian-Cup)

B LIGHT , Southern. Sclerotium rolfsii, FL.
C ANKER , Stem. Diaporthe phaseolorum var.
caulivora, LA.
L EAF S POT . Cercospora sidicola;
Colletotrichum malvarum, KS, TX, UT;
Phyllosticta spinosa, KS, TX; Ramularia
sidarum, FL; Sclerotinia minor (bleached
leaf and stem lesions), NC.
N EMATODE , Root Knot. Meloidogyne spp., AL,
FL, MS.
R OT ,Root.Phymatotrichum omnivorum,TX.
R UST . Puccinia heterospora, FL to TX, IN, MO;
P. lobata, AZ, CA, NM, TX, UT;
P. schedonnardi, NM.
V IRUS . Abutilon Mosaic, FL.

B ACTERIAL Leaf Spot. Pseudomonas syringae
pv. tagetis, WI.
D OWNY M ILDEW . Plasmopara halstedii, IL, IA,
WI to AR, KS, MN.
L EAF S POT . Ascochyta compositarum, WI;
Cercospora silphii, AL, IL, KS, TX, WV,
WI; Colletotrichum silphii, WI; Septoria
alba, IL, KS.
P OWDERY M ILDEW . Golovinomyces

cichoracearum, CT, MD.
R OT , Root. Phymatotrichum omnivorum, TX;
Rhizoctonia solani, ME.
R UST . Puccinia silphii (III), NC to AL, TX, ND;
Coleosporium terebinthinaceae (II, III), PA
to FL, TX, KS; 0, I on pines; Uromyces silphii
(0, I), OH to MO, KS and WI; II, III on Juncus .
S MUT , White.

Entyloma compositarum,

TX, WI.

Silene (Catchfly, Cushion-Pink,
Campion)

Skimmia

B ROOMRAPE . Orobanche ramosa, TX.
D AMPING -O FF . Rhizoctonia solani, IL.
D OWNY M ILDEW . Peronospora silenes, IL, KS,
NE, TX, WI.
L EAF S POT . Ascochyta silenes, MT, OK, WI;
Marssonina delastrei, WI; Phyllosticta
nebulosa, MT, NY, WI; Septoria dimera,
NE, WI; S. silenes.
R UST . Uromyces silenes (0, I, II, III), CA, IA, KS,
MT, PA, WA; U. suksdorfii, CA, ID, NM,
UT, WA; Puccinia aristidae (0, I), AZ, TX.
S MUT , Flower. Sorosporium saponariae, CO,
NV, UT; Ustilago violacea, anther smut,
CA, MT, NH, TX, VA, WA, WY.

V IRUS . Tobacco Ring Spot, NY.

Skullcap (Scutellaria)

L EAF S POT . Cercospora scutellariae, IL, MS,
MO, TX; Phyllosticta decidua, TX, WI;
Septoria scutellariae,MEtoIA,CA,CO,
MS, OK.
P OWDERY M ILDEW . Erysiphe galeopsidis,IL,IN,
IA, KS, MI, NY, OH, WI; Microsphaera sp.,
IL.
R OT , Root. Phymatotrichum omnivorum, TX;
Rhizoctonia solani, TX.
R OT , Stem. Botrytis cinerea, WA.
V IRUS . Alternanthera Mosaic, FL, MD, PA.

Silk-Tassel Bush (Garrya)

B LACK M ILDEW . Lembosia lucens, CA.
L EAF S POT . Cercospora garryae, CA, TX;
Dothichiza

Skunk-Cabbage (Symplocarpus)

garryae, CA; Phyllosticta

garryae, CA, TX.
R OT , Root. Phymatotrichum omnivorum, TX.

B LIGHT , Leaf. Botrytis streptothrix, CT, IL,
NJ, NY.