Host Plants - Westcott's Plant Disease - page 521

Gooseberry (Ribes) Gordonia (Franklinia and

Loblolly-Bay)

A NTHRACNOSE . Pseudopeziza ribis, general.
B LIGHT , Cane. Botryosphaeria ribis, NJ, VA;
Leptosphaeria coniothyrium, IN, MO.
B LIGHT , Thread. Pellicularia koleroga, FL.
C ANKER ;D IEBACK . Nectria cinnabarina, coral
spot; Botrytis cinerea, CT, OR, WA;
Phragmodothella

B LACK M ILDEW , Meliola cryptocarpa, FL, LA.
L EAF S POT . Phyllosticta gordoniae, FL.
R OT , Root. Phymatotrichum omnivorum, TX.

Gouania ribesia, twig knot;

Physalospora obtusa, NY to VA, KS.
D ODDER , Cuscuta sp., MN, NY.
D OWNY M ILDEW . Plasmopara ribicola, MT, OR,
WV, WI.
L EAF S POT . Marssonina grossulariae, OH, WI;
Cercospora angulata, NY to MI, MO;
Mycosphaerella ribis, MA to VA, AL, KS,
MN, OR; Phyllosticta grossulariae, CT, NJ,
WA, WI; Ramularia sp., MI.
N EMATODE ,

R UST . Puccinia invaginata (II, III), FL.

Gourd (Lagenaria, Luffa,
Trichosanthes)

A NTHRACNOSE . Colletotrichum lagenarium, CT,
IL, IN, IA, MD, MN, NE, PA.
B ACTERIAL , Angular Leaf Spot. Pseudomonas
lachrymans, WI.
B LIGHT , Southern. Sclerotium rolfsii, SC.
B LIGHT , Thread. Pellicularia koleroga, FL.
D OWNY M ILDEW . Pseudoperonospora cubensis,
CT, FL, MA, NC, OH.
F RUIT S POT . Macrophoma trichosanthis, AL;
Phoma subvelata, TX; Stemphylium sp.,
NY.
L EAF S POT . Cercospora cucurbitae, AL, IN.
N EMATODE , Root Knot. Meloidogyne sp., AL, FL,
OH.
P OWDERY

Leaf, Bud. Aphelenchoides

ritzemabosi, CA.
N ONPARASITIC . Leaf Blotch. Magnesium defi-
ciency, OR.
Leaf Scorch. Potassium deficiency.
P OWDERY M ILDEW . Sphaerotheca macularis,
MN; S. mors-uvae, general; Micro-
sphaera grossulariae, CA; Phyllactinia
corylea, NY.
R OT , Root. Armillaria mellea, OR, WA;
Dematophora sp.; Xylaria hypoxylon, OR;
Phymatotrichum omnivorum, TX.
R UST . Puccinia caricina var. grossulariata (0, I)
leaves, fruit, ME to MD, AK, ID, KS, MS, II,
III on Carex ; P. caricina var. uniporula, IA,
MD, NY, WI; Coleosporium jonesii (II, III),
CO, MO, MN, NM, WI, WY; Cronartium
occidentale, AZ, CO, UT; C. ribicola, white
pine blister rust (II, III) - European varieties
are resistant.
S POT

M ILDEW . Golovinomyces

cichoracearum, CT, WI.
R OT ,

Fruit. Mycosphaerella citrullina

( Laestadia cucurbitacearum ), PA.
R OT , Root. Phymatotrichum omnivorum, TX.
V IRUS . Cucumber Mosaic, IN, NY; Tobacco
Ring Spot, TX, on Luffa acutangula ; Zuc-
chini Yellow Mosaic, Papaya Ringspot -
Type W, Brazil.

A NTHRACNOSE , Scab. Sphaceloma

ribis, WA.
V IRUS . Mosaic. Unidentified, IL, NY.
Powdery mildew caused by Sphaerotheca
mors-uvae is probably the most important
gooseberry disease but is readily controlled by
a lime-sulfur spray immediately after bloom,
followed by bordeaux mixture spray for leaf
spots.

Grape (Vitis)

A NTRACNOSE . Elsino¨ ampelina, MI.
B ACTERIAL Crown Gall. Agrobacterium

tumefaciens, widespread.
B ACTERIAL Leaf Spot. Xanthomonas sp., NY.