Host Plants - Westcott's Plant Disease - page 530

Sphaerognomonia carpinea, GA;
Gnomoniella coryli, general; Alternaria
arborescens, A. alternata, A. tenuissima
(leaf spot and brown/gray apical necrosis),
AZ.
N ONPARASITIC .

Hedge Parsley (Torilis)

G ALL , Leaf. Protomyces macrosporus, AR.

Bitter Pit and Brown Stain

of nuts. Cause unknown, OR, WA.

Helenium (Sneezeweed)

Shrivel, “Blanks.” Defective pollination,

OR, WA.
P OWDERY M ILDEW . Phyllactinia corylea, north-
eastern and north central states, OR, WA;
Microsphaera alni, northeastern and north
central states; P. gutata, WA.
R OT , Root. Armillaria mellea, CA, OR, WA;
Phymatotrichum omnivorum, TX.
R OT , Wood. Poria ferrea, CA.
V IRUS . Apple Mosaic, OR; Clover Yellow Edge
Phytoplasma, OR.
Bacterial blight often kills young trees in
Washington and Oregon. Powdery mildew is
important in the Northwest.

B ACTERIAL , MLO. Aster Yellows, NY, and Cali-
fornia Aster Yellows, CA.
L EAF S POT . Cercospora helenii, AL, TX;
Septoria helenii, IA, PA, TX.
P OWDERY M ILDEW . Golovinomyces
cichoracearum, CO, OR, TX, UT, WA,
WI, WY.
R OT , Root. Phymatotrichum omnivorum, TX.
R UST . Puccinia conspicua (0, I), AZ, CO, NM; II,
III on Koeleria , P. dioicae (0, I), CO, NE, TX;
II, III on Carex .
S MUT . Entyloma compositarum, TX, WI;
E. polysporum, MT.
V IRUS . Helenium S. Carlavirus.

Heath (Erica)

P OWDERY M ILDEW . Erysiphe polygoni, CA.
R OT , Helichrysum Collar. Phytophthora cinnamomi,

CA, NY.
R OT , Root and Crown. Cylindrocladium
pauciramosum, CA.
R OT , Stem. Ascochyta sp., NJ.
R UST . Pucciniastrum ericae (II), CA.

Strawflower.

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Heliopsis

Heather (Calluna)

B ACTERIAL , Proliferation. Rhodococcus fascians,
OR.
B LACK K NOT . Gibberidea heliopsidis.
L EAF S POT . Phyllosticta pitcheriana, NY;
Septoria helianthi,IN;S. heliopsidis, WI.
P OWDERY M ILDEW . Golovinomyces
cichoracearum, IA, MN, NE, NM, ND, WI;
Leveillula taurica, IA.
R OT , Root. Phymatotrichum omnivorum, TX.
R UST . Coleosporium helianthi (II, III), NC; 0,
I on pine; Puccinia batesiana (0, I, III), DE,
IA, KS, MD, MN, NE, PA, WI; P. helianthi
(0, I, II, III), IN, MN, NC, PA, VA.
V IRUS . Mosaic. Unidentified, IA.

N ONPARASITIC . Chlorosis. Iron deficiency,
corrected by spraying with ferrous sulfate.
R OT , Root, Collar. Phytophthora cinnamomi,
CA, OR.

Hebe

B ACTERIAL Fasciation. Clavibacter fascians, CA.
L EAF S POT . Septoria exotica, CA.
R OT , Root. Armillaria mellea, CA.
W ILT . Fusarium oxysporum f. sp. hebae, CA.