Host Plants - Westcott's Plant Disease - page 636

Spathiphyllum Spiderling, Wine-Flower (Boerhaavia)

L EAF S POT . Myrothecium roridum, FL.
N ECROTIC

B ACTERIAL Leaf Spot. Xanthomonas campestris,
TX.
L EAF S POT . Ascochyta boerhaaviae, TX;
Cercospora boerhaaviae, TX.
N EMATODE , Root Knot. Meloidogyne spp.
R OT , Root. Phymatotrichum omnivorum, TX.
W HITE R UST . Albugo platensis, AZ, FL, NM, TX.

L ESIONS . Pectobacterium

carotovorum subsp. carotovorum,

Argentina.

Specularia (Venus Looking-Glass)

D ODDER . Cuscuta sp., TX.
G ALL , Leaf. Synchytrium sp., TX.
L EAF S POT . Cercospora speculariae, LA;
Septoria speculariae, KS, PA to AL,
TX, WI.
R OT , Root. Phymatotrichum omnivorum, TX.
R UST . Coleosporium campanulae (II, III), NC,
PA.
S MUT , Seed. Ustilago speculariae,OK.

Spinach (Spinacea)

A NTHRACNOSE . Colletotrichum spinaciae,CT,
LA, MS, NJ, NY, TX, VA; C. spinacicola
( Gloeosporium spinaciae ); C. dematium,CA.
B ACTERIAL Leaf Spot. Pseudomonas syrinagae
pv. syringae, CA.
B ACTERIAL , MLO. Aster Yellows.
B ACTERIAL Soft Rot. Erwinia carotovora, gen-
eral in transit, market.
B LIGHT , Phytophthora.

Sphacele (Pitcher-Sage)

Phytophthora capsici,

R UST . Uredo sphacelicola (II), CA. IL.

D AMPING -O FF ; Root Rot. Rhizoctonia solani,
general; Pythium spp., preemergence seed
decay.
D OWNY M ILDEW . Peronospora effusa, general;
P. farinosa f. sp. spinaciae, AZ, AR, CA, FL.
L EAF S POT . Cercospora beticola, CA, GA,
IL, IA, MA, NY, TX; Phyllosticta
chenopodii, DE, NJ, NY, VA; Stagonospora
spinaciae, SD; Alternaria spinaciae, MA;
Stemphylium botryosum, AZ, CA, DE,
MD; Cladosporium variabile, WA;
Bipolaris sp., FL.
M OLD , Leaf. Cladosporium macrocarpum, sec-
ondary, DE, OK, PA, TX; Heterosporium
variabile, pinhead “rust,” general.
M OLD , Seed. Pleospora herbarum ( Stemphylium
botryosum ); Alternaria sp., and secondary
leaf spot; Curvularia inaequalis.
N ECROTIC , Circular Tan Leaf.

Spice-Bush (Lindera)

C ANKER . Botryosphaeria ribis var.

chromogena,MD.
L EAF S POT . Phyllosticta linderae, DE, IN, WV;
P. lindericola, WV.
M ISTLETOE .

Phoradendron serotinum

(flavescens), eastern states.
R OT , Root. Phymatotrichum omnivorum,
TX.

Spider-Lily (Hymenocallis)

L EAF B LOTCH ; Red Spot. Stagonospora curtisii,
CA, TX.
L EAF S POT . Cercospora amaryllidis, TX;
C. pancratii, FL, LA, TX; Gloeosporium
hemerocallidis, TX.
N EMATODE , Spiral. Rotylenchus blaberus.
V IRUS . Mosaic. Unidentified, CA.

Stemphylium

botryosum, TX.
N EMATODE . Clover Cyst. Heterodera trifolii.
N EMATODE , Root Knot. Meloidogyne spp.
N ONPARASITIC . Yellows. Nutrient deficiency.