Host Plants - Westcott's Plant Disease - page 612

B LIGHT , Gray Mold. Botrytis cinerea, frequent in
greenhouses, occasional in gardens.
L EAF S POT . Ascochyta primulae, WI; Asteroma
garretianum, black spot, CO, UT;
Cercosporella primulae, WA;
Colletotrichum primulae, FL;
Mycosphaerella sp., AZ; Ramularia
primulae, CA, CT, DE, NY.
N EMATODE , Leaf and Stem. Ditylenchus dipsaci,
CA, MD, PA.
N EMATODE , Root Knot. Meloidogyne spp., occa-
sional in greenhouses.
N ONPARASITIC . Chlorosis. Excessive soil acidity
or iron or magnesium deficiency.
P OWDERY M ILDEW . Erysiphe polygoni, CT, NJ,
VA.
R OT , Root. Pythium irregulare, CA; Rhizocto-
nia solani, FL, IL, TX; Phymatotrichum
omnivorum, TX.
R OT , Stem. Alternaria sp., CT; Sclerotinia
sclerotiorum, MD.
R UST . Puccinia aristidae (0, I), ME; Uromyces
apiosporus, CA, NV.
V IRUS . Primrose Mosaic; Cucumber Mosaic;
Tobacco Necrosis; Tomato Spotted Wilt;
Impatiens Necrotic Spot, NC.

N EMATODE , Root Knot. Meloidogyne spp., south-
ern states.
N ONPARASITIC . Chlorosis. Manganese deficiency,
FL.
P ARASITIC Lichen. Strigula elegans and

S. complanata, southern U.S., GA.
P OWDERY M ILDEW . Nicrosphaeria alni, IN, LA,
NJ, OH, on Ligustrum japonicum (Wax-leaf
Ligustrum).
R OT . Rosellinia necatrix, CA; Ganoderma
applanatus, collar rot.
R OT ,Root.Armillaria mellea, AR, CA, MS, TX;
Clitocybe monadelpha,AR;C. tabescens,
FL; Phymatotrichum omnivorum, AZ, OK,
TX.
R OT , Wood. Stereum hirsutum, cosmopolitan;
Polyporus versicolor, cosmopolitan.
S OOTY M OLD . Common after whiteflies in the
South.
V IRUS . Variegation. Graft transmitted. Chlorotic
Spot, LA; Ligustrum Line Pattern, AR.

Prunella (Self-Heal, Heal-All)

B LIGHT , Southern. Sclerotium rolfsii, TX.
L EAF S POT . Gibberidea abundans, tar spot, ME,
WA; Linospora brunellae, AK, ID, WA;
Phyllosticta brunellae, TX; Ramularia
brunellae, IL, IN, NY, OH, TX, VA, WI;
Septoria brunellae, general.
P OWDERY M ILDEW . Golovinomyces
cichoracearum, PA; Sphaerotheca
macularis, IL, IN, MD, MS, WA, WI.
R OT , Root. Pythium palingenes; P. polytylum,
VA.
V IRUS . Tomato Ringspot, VT.

Privet (Ligustrum)

A NTHRACNOSE ; Canker; Dieback. Glomerella
cingulata, general, especially on common
privet.
B ACTERIAL Crown Gall. Agrobacterium

tumefaciens, occasional.
B LIGHT , Leaf. Ramularia sp., NJ, WA.
B LIGHT , Thread. Pellicularia koleroga, FL.
D ODDER . Cuscuta sp., FL.
G ALL . Phomopsis sp., MD, TX; P. ligustri-
vulgaris, blight, PA; Phoma sp., TX.
L EAF S POT . Cercospora adusta, DE to AL, TX;
C. ligustri, Gulf states; Exosporium
concentricum, TX; Phyllosticta ovalifolii,
MD, MS, TX; Corynespora cassiicola, FL.
L EAF S POT , Algal. Cephaleuros virescens, Gulf
states.
N EMATODE , Leaf. Aphelenchoides fragariae.

Pulmonaria

R OT , Petiole. Sclerotium rolfsii var. delphinii,
IA.

Pumpkin

Squash

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