Host Plants - Westcott's Plant Disease - page 629

R OT , Root. Armillaria mellea; B LIGHT , Southern. Sclerotium rolfsii, LA.

B LOTCH , Purple. Alternaria porri, CA, LA, TX.
D OWNY M ILDEW . Peronospora destructor, LA.
N EMATODE , Root Knot. Meloidogyne sp., TX.
R OT , Bulb and Basal. Fusarium culmorum, CA.
R OT , Neck; Gray Mold, Botrytis allii, LA;
Smudge, Colletotrichum circinans, IL, LA,
WI.
R OT , Pink Root. Pyrenochaeta terrestris, CO,
LA, TX; Fusarium solani, TX.
R OT , White. Sclerotium cepivorum, LA, VA.
S MUT . Urocystis cepulae,MA.
V IRUS . Mosaic, unidentified; Tomato Spotted
Wilt, GA; Irish Yellow Spot, CO, OR.
Pink root and white rot are prevalent in Louisi-
ana. Losses from white rot are heavy if plants are
set late; September setting may give a good crop.

Phymatotrichum omnivorum, TX.
R OT , Trunk; Heart. Fomes annosus; Ganoderma
sequoiae; Poria sequoiae; P. albipellucida.
R OT , Wood. Hymenochaete tabacina; Lenzites
saepiaria; Merulius hexagonoides;
Polyporus spp.; Schizophyllum commune;
Stereum spp.; Trametes spp.

Seriocarpus (White-Topped Aster)

R UST . Coleosporium asterum (II, III), CT;
Puccinia dioicae (0, I), IN, NC, TN.

Sesame (Sesamum)

B ACTERIAL Leaf Spot. Pseudomonas sesami, KS,
TX.
B ACTERIAL Wilt. Pseudomonas solanacearum,
AZ.
B LIGHT . Corynespora cassiicola, MS, Southeast.
L EAF S POT . Alternaria sesami, Southeast;
A. tenuissima, TX; Cercospora sesami, FL,
GA, SC; Cylindrocladium sesami, FL, SC;
Helminthosporium sesami, TX.
R OT , Charcoal. Macrophomina phaseoli, CA,
TX.
V IRUS . Cowpea Aphid-Borne Mosaic, Paraguay.
W ILT . Verticillium albo-atrum, NM.

Shasta Daisy (Leucanthemum
x Superbum)

B ACTERIAL Fasciation. Clavibacter fascians, CA.
L EAF B LOTCH . Septoria leucanthemi, CA, OR.
L EAF S POT . Cercospora chrysanthemi, OK.
N EMATODE , Root Knot. Meloidogyne spp., AL,
FL, MS.
R OT , Root. Pythium sp., NJ.
R OT , Stem. Rhizoctonia solani,MD;Sclerotinia
sclerotiorum, MT, WA; Fusarium roseum
and F. solani, TX.

Sesuvium Shepherd's Purse (Capsella)

N EMATODE , Root Knot. Meloidogyne sp., AL, FL.
R OT , Root. Phymatotrichum omnivorum, TX.
R UST . Puccinia aristidae (0, I), TX; II, III on
grasses.
W HITE R UST . Albugo trianthemi, TX.

B ACTERIAL , Yellows. Spiroplasma citri, IL.

Shining Willow (Salix lucida)

L EAF S POT . Septoria musiva, Quebec, Canada.
B ACTERIAL , Yellows. Spiroplasma citri, IL.

Shallot (Allium ascalonicum;
A. porrum, Leek)

Shortia (Oconee-bells)

B ACTERIAL Blight. Pseudomonas syringae pv.

porri, CA.
B ACTERIAL , MLO. Aster Yellows, LA. L EAF S POT . Pezizella oenotherae, NC, SC.