Host Plants - Westcott's Plant Disease - page 539

L EAF S POT . Cercospora houstoniae, DE;
Septoria sp., TX.
R OT , Root. Phymatotrichum omnivorum,
TX.
R UST . Puccinia lateritia, TX; Uromyces
houstoniatus (0, I), MA to MS, IL, MO, WI;
II, III on blue-eyed grass; U. peckianus (0, I),
AL, MS, TX; II, III on grasses.

Hyacinth (Hyacinthus)

B ACTERIAL Soft Rot. Erwinia carotovora,

cosmopolitan.
B ACTERIAL Yellows. Xanthomonas hyacinthi,
occasional in imported bulbs.
B LIGHT , Gray Mold. Botrytis hyacinthi, WA;
B. cinerea, NC, after frost.
N EMATODE , Bulb; Ring Disease. Ditylenchus
dipsaci, NJ, Pacific states.
N ONPARASITIC . Loose Bud; Stem Break.Exces-
sive water intake during early shoot growth.
R OT , Black. Sclerotinia sclerotiorum, Pacific
Northwest; S. bulborum, black slime.
R OT , Bulb. Fusarium sp., CO, MO, NJ, RI, TX,
WA; Penicillium spp., blue mold, cosmopolitan.
R OT , Root. Phytophthora sp., NJ.
V IRUS . Ornithogalum Mosaic, CA, MD, NY,
OR, TX, WA; Hyacinth Mosaic, OR.

Hoya

L EAF S POT . Myrothecium roridum, FL.

Huckleberry (Gaylussacia)

B LACK M ILDEW . Dimerosporium ellissi, MS, NJ.
D ODDER . Cuscuta sp., PA.
G ALL , Leaf. Exobasidium vaccinii, ME to VA,
AL, FL, WI; Synchytrium vaccinii, red lead,
NJ.
L EAF S POT . Ophiodothella vaccinii, TX;
Pestalotia vaccinii,WV;Phyllosticta sp.,
NJ, PA; Ramularia effusa, WI; Rhytisma
vaccinii, tar spot, MA, OK, SC.
N EMATODE , Root Knot. Meloidogyne sp., OK.
P OWDERY M ILDEW . Microsphaera alni

Hydrangea

B ACTERIAL L EAF S POT . Xanthomonas

campestris, GA.
B ACTERIAL , MLO. Hydrangea virescence.
B ACTERIAL Wilt. Pseudomonas solanacearum,
NY.
B LIGHT , Flower; Gray Mold. Botrytis cinerea,
cosmopolitan, especially after frost.
B LIGHT , Southern. Sclerotium rolfsii, FL.
L EAF S POT . Ascochyta hydrangeae, AK, NJ;
Cercospora arborescentis, IL, OK;
C. hydrangeae, MD, VA to AL, FL, TX;
Colletotrichum sp., MD, NJ; Phyllosticta
hydrangeae, IN; Septoria hydrangeae, CT,
MS, OH; Corynespora cassiicola, FL, GA;
Phoma exigua; Myrothecium roridum, TN.
N EMATODE , Leaf. Aphelenchoides sp.
N EMATODE , Lesion. Pratylenchus pratensis, TX.
N EMATODE , Root Knot. Meloidogyne spp., MS,
OK, TX.
N EMATODE , Stem, Bulb. Ditylenchus dipsaci.
N ONPARASITIC . Chlorosis. Iron deficiency, excess
lime.
P OWDERY M ILDEW . Erysiphe polygoni,general.

var.

vaccinii, widespread.
R UST . Pucciniastrum myrtilli (II, III), ME to
VA, WI; 0, I on hemlock.

Huckleberry (Vaccinium)

B LIGHT , Sudden Oak Death. Phytophthora
ramorum, CA.
V IRUS . Blueberry Scorch. British Columbia,
Canada.

Huisache, Sweet Acacia (Acacia
farnesiana)

R OT , Root. Clitocybe tabescens, FL;

Phymatotrichum omnivorum, TX.
R UST . Ravenelia australis, TX; R. hieronymi,
witches' broom, TX; R. siliquae, NM, TX.