Host Plants - Westcott's Plant Disease - page 598

P OWDERY M ILDEW . Oidium sp., MN, NJ,NY, VA,
Austria, Hungary.
R OT , Black Stem. Stemphyliumbotryosum, sec-
ondary, TX.
R OT , Crown. Phytophthora nicotianae var.
parasitica, FL;

R OT , Stem. Phytophthora spp., FL.
S OOTY M OLD . Capnodium sp.

Phlox

Phytophthora parasitica,

CO.
R UST . Puccinia aristidae (0, I), AZ.
V IROID . Tomato Chlorotic Dwarf, USA.
V IRUS . Beet Curly Top, CA, OR; Tobacco Etch;
Tobacco Mosaic; Cucumber Mosaic, gen-
eral; Tobacco Ring Spot; Tomato Spotted
Wilt, CA; Impatiens Serotype, GA, FL;
Petunia Vein-Clearing, MN; Potato
Rugose Mosaic; Bidens Mottle, FL; Brome-
grass Mosaic, General; Calibrachoa Mottle,
CA, FL.
W ILT . Fusarium sp., WA; Sclerotinia
sclerotiorum, WA; Verticillium albo-
atrum, CA.
Dodder is common on petunias, reported
in window boxes as well as in garden beds.
Plants started in greenhouses may get
infected with tobacco mosaic. Smoking around
petunias, or a tobacco-stem mulch, may also fos-
ter mosaic.

B ACTERIAL Crown Gall. Agrobacterium

tumefaciens, NJ.
B ACTERIAL Fasciation. Clavibacter fascians, CA.
B ACTERIAL , MLO. Aster Yellows, NJ, NY, PA,
and California Aster Yellows, CA.
B LIGHT , Gray Mold. Botrytis cinerea, AK.
B LIGHT , Southern; Crown Rot. Sclerotium
rolfsii, CT, FL, IL, MD, NJ, NY, OH, TX, VA.
B LIGHT , Stem. Pyrenochaeta phlogis, NY.
C ANKER , Stem. Colletotrichum sp., FL.
D OWNY M ILDEW . Peronospora phlogina, IA, WI.
L EAF S POT . Ascochyta phlogis var. phlogina,MA,
NY, TX; Cercospora omphakodes,NYtoIA,
WI; Macrophoma cylindrospora, CA;
Phyllosticta sp., WA; Septoria spp.; Volutella
phlogina, LA; Ramularia

sp., WA;

Stemphylium botryosum ( Pleospora

herbarum ), NJ.
N EMATODE , Leaf. Aphelenchoides fragariae,
MD
N EMATODE , Leaf and Stem. Ditylenchus dipsaci,
CA, CT, MD, NJ, NY, OH, TX, WA. NEMA-
TODE, Root Knot. Meloidogyne spp., KS,
MD, MA, NJ, OH, TX, WA.
N ONPARASITIC . Leaf Drop; “Rust,” Blight. Cause
uncertain but includes inability of old stems of
some varieties to take up enough water.
P OWDERY M ILDEW . Golovinomyces
cichoracearum, general; Sphaero theca
macularis, KS, NH, NY, OH, WA.
R OT , Charcoal. Macrophomina phaseoli, IL.
R OT ,

Philibertia

P OWDERY M ILDEW . Phyllactinia corylea, FL.
R UST . Puccinia bartholomaei (0, I), AZ;
P. obliqua (III), AZ, CA, FL, NM, TX.

Philodendron

A NTHRACNOSE . Gloeosporium sp., WA;
Colletotrichum sp., WA.
B ACTERIAL Leaf Rot. Erwinia chrysanthemi, FL.
B LIGHT , Southern. Sclerotium rolfsii, CA.
L EAF S POT . Colletotrichum philodendri, NJ.
N EMATODE , Burrowing. Radopholus similis, FL;
Root Knot. Meloidogyne sp.
N EMATODE , Spiral. Helicotylenchus nannus:
Lesion Pratylenchus sp., FL.
N ONPARASITIC . Exudation of sugars, CA.
R OT , Root. Pythium splendens, FL.

Root. Thielaviopsis basicola;

Phymatotrichum omnivorum, TX.
R UST . Puccinia douglasii (0, I, III), CO, MT, NE,
NJ, NM, OR, PA, UT, WA, WY;
P. plumbaria (0, I, III), IL, IA, MO, TX,
WY to NM, CA, WA; Uromyces acuminatus
var. polemonii (0, I), IL, IA, MN, MS, SD,
WI.
V IRUS . Angelonia Flower; Mosaic, MD, NY,
NC; Tomato Spotted Wilt-Impatiens Sero-
type, GA, FL; Tobravirus, IL, MI, MN.