Host Plants - Westcott's Plant Disease - page 651

Thalia Thistle, Creeping (“Canada”) (Cirsium

arvense)

L EAF S POT . Cercospora thaliae, LA.
R UST . Puccinia thaliae (II, III), FL.

P OWDERY M ILDEW . Golovinomyces

cichoracearum, ID, OR.

Thermopsis (Bush-Pea, Golden-Pea)

Thistle, Ivory and Milk (Silybum)

L EAF S POT . Cercospora thermopsidis, CO, MT;
Phoma thermopsidicola, CA; Ramularia
sphaerpioides, WA; Stigmina thermopsidis,
CA.
P OWDERY M ILDEW . Erysiphe polygoni, Rocky
Mts., and Pacific Northwest.
V IRUS . Bean Yellow Mosaic in false lupine
( Thermopsis caroliniana ), MN.

R UST . Puccinia punctiformis, MD.
S MUT , Biological Control. Microbotryum

silybum, MD.

Thistle Musk (Carduus thoermeri)

R UST . Puccinia carduorum, CA, MO, NV,
OK, VA.

Thistle (Cirsium)

L EAF S POT . Cercospora spp., WA, KS, TX;
Phyllosticta cirsii, NY, WA, WI;
Stagonospora cirsii, WI; Septoria cirsii,VT
to IN, TX, WI; Alternaria chrysanthemi,
MT.
P OWDERY M ILDEW . Golovinomyces
cichoracearum, general; Phyllactinia
corylea, WA; Sphaerotheca macularis, MD.
R OT ,

Thlaspi

L EAF S POT . Alternaria brassicicola, NY.

Thoroughwax (Bupleurum)

Root. Rhizoctonia solani, IL;

Phymatotrichum omnivorum, TX.
R UST . Puccinia cirsii (0, I, II, III), PA to NC, CA,
OR, TX; P. punctiformis (0, I, II, III), ME to NJ,
CA, OH, WA; Uromyces junci (0, I), MO, NE,
ND.
S MUT ,

N EMATODE , Root Knot. Meloidogyne sp., CA.

Thujopsis (Hiba Arborvitae)

Inflorescence. Thecaphora trailii,

CO, UT.
W HITE RUST . Albugo tragopogonis, NY to IA,
LA, TX, WY.

B LIGHT , Twig. Phomopsis occulta, CA.

Thunbergia (Clockvine)

Thistle, Blessed (Cnicus) B ACTERIAL Crown Gall. Agrobacterium

tumefaciens, CT, FL.
B ACTERIAL , MLO. Aster Yellows, NY.

B LIGHT , Southern. Sclerotium rolfsii, GA.