Host Plants - Westcott's Plant Disease - page 526

V IRUS . Bromegrass Mosaic. General, IA, IL;
Clover Yellow Vein, GA; Maize Dwarf
Mosaic; Peanut Mottle, GA; St. Augustine
Decline Virus (Panicum Mosaic), AR, LA,
TX; Sugarcane Mosaic, FL, IL; Barley Yel-
low Dwarf, IN, MO; Cocksfoot Streak;
Agropyron Mosaic; Grapvine Fanleaf, CA;
Lolium Latent, MD.
W ILT , Necrosis. Acidovorax spp., NC.
The possibility of any large proportion of
these diseases appearing in the average suburban
lawn is remote. Snowmold occurs occasionally
after a winter when the snow cover has been
rather continuous, but the light tan areas disap-
pear by late spring. Large brown patch is fairly
general in humid summer weather along with
dollar spot, and Helminthosporium leaf spots or
melting-out. Merion bluegrass is resistant to the
latter but not to bluegrass rust. Acremonium sp.
first Clavicipitaceous endophyte of perennial rye-
grass ( Lolium perenne ) caused a hyperthermia
syndrome of cattle, TX, WA.

R OT , Root. Phymatotrichum omnivorum, TX.
R UST . Coleosporium asterum (II, III), CA, CO,
WA, WI; 0, I on pine; Puccinia dioicae (0, I),
KS, NE, TX; II, III on Carex ; P. grindeliae
(III), NE to TX, CA, MT; P. stipae (0, I), CO,
KS, NE, ND, SD; II, III on Stipa and other
grasses; Uromyces junci (0, I); II, III on
Juncus .
S MUT , Inflorescence. Thecaphora californica,
CA, UT; T. Cuneata, CO, KS, NE, NM.

Ground-Cherry, Husk-Tomato
(Physalis)

B ACTERIAL Angular Leaf Spot. Pseudomonas

angulata, KY.
B ACTERIAL Canker. Vascular. Clavibacter
michiganense, WY. Also Pseudomonas
longifolia.
B ACTERIAL , Wildfire. Pseudomonas syringae pv.
tabaci, PA.
B LIGHT , Seedling. Gloeosporium fructigenum,
NY.
B LIGHT , Southern. Sclerotium rolfsii, FL.
L EAF S POT . Alternaria solani; Cercospora
diffusa, IL, KS, WI; C. physalicola,CTto
GA, TX; Leptosphaeria physalidis, KY;
Phyllosticta sp., OK; Septoria sp., NE;
Stemphylium solani, FL.
N ECROSIS ,Vascular.Verticillium dahliae,NM.
N EMATODE , Leaf and Stem. Ditylenchus dipsaci,
CA.
N EMATODE , Root Knot. Meloidogyne spp., AL,
FL.
P OWDERY M ILDEW . Sphaerotheca fusca, CA.
R OT , Root. Phymatotrichum omnivorum,TX.
R UST . Aecidium physalidis, WI to TX, CO, NM;
Puccinia physalidis, CO, IA, MN, NE, WI.
S MUT , White. Entyloma australe, MA to MS,
NM, ND.
V IRUS . Beet Curly Top; Mosaic (part cucumber,
part tobacco mosaic); Ring Spot (Tobacco);
Physalis Mosaic, IL; Potato Leafroll, Pacific
Northwest; Tomato Spotted Wilt, GA;
Yellowing Stunting Disorder, CA.

Grass-Of-Parnassus (Parnassia)

P OWDERY M ILDEW . Erysiphe polygoni, NY.
R UST . Puccinia parnassiae (III), UT; P. caricina
var. uliginosa, (I), AK; II, III on Carex .

Grevillea (Silk-Oak)

D IEBACK ; Gum Disease. Diplodia sp.

( Physalospora rhodina ), FL.
L EAF S POT , Algal. Cephaleuros virescens, FL.
N EMATODE , Root Knot. Meloidogyne sp., CA.
R OT , Root. Phymatotrichum omnivorum, AZ.

Grindelia (Gumweed)

L EAF S POT . Cercospora grindeliae, CA, TX,
WI; Septoria grindeliae, CO, KS, TX;
S. grindeliicola, WI.
P OWDERY M ILDEW . Golovinomyces
cichoracearum, MN to NM, CA, MT.