Biology Reference
In-Depth Information
P
OWDERY
M
ILDEW
.
Golovinomyces
G. clavipes, quince rust (0, I), on leaves,
fruits, general, east of Rocky Mts.;
G. exiguum, on leaves, fruits, TX; II, III on
juniper; G. floriforme, on leaves, SC to FL,
OK, TX; III on red-cedar; G. globosum, haw-
thorn rust (0, I) on leaves, ME to ND, FL, TX;
II, III on juniper; G. hyalinum (0, I), leaves,
Atlantic Coast, NC to FL; III unknown;
G. libocedri (0, I), leaves and fruit, Pacific
Coast; III on
Libocedrus
; G. nelsonii (0, I),
on leaves, fruits, WY; III on juniper;
G. trachysorum (0, I), on leaves, Atlantic
and Gulf coasts; III on red-cedar;
G. tubulatum (0, I), on leaves, Rocky Mts.
to OR and WA.
S
CAB
. Venturia
cichoracearum, PA, TX;
Sphaerotheca
macularis, IL.
R
OT
, Root. Phymatotrichum omnivorum, TX.
R
UST
. Puccinia dioicae (0, I), PA to IL, CA, MT,
OR, WI; II, III on
Carex
; P. fraseri (III), MT,
NE, NY, NH, PA, TN, VA, WV; P. hieracii
(0, I, II, III), ME to VA, CA, CO FL, IL, TX,
WA; P. columbiensis, OR, TX, WA;
Aecidium columbiense (0, I), CA, ID, OR,
WA.
Hawthorn (Crataegus)
B
ACTERIAL
Fire Blight. Erwinia amylovora,
widespread, especially on English hawthorn.
B
LIGHT
, Leaf. Fabraea thuemenii (
F. maculata,
Entomosporium thuemenii
), East and central
states, southward.
B
LIGHT
, Leaf; Fruit Spot. Monilinia johnsonii,
NY to MN.
B
LIGHT
, Seedling. Sclerotium rolfsii, FL.
C
ANKER
, Felt Fungus.
inaequalis, widespread;
V. crataegi, FL.
Rusts are common on hawthorn and particu-
larly so in the central states, where junipers
should be kept at a distance. Leaf blight, begin-
ning in a moist spring, causes spotting and defo-
liation in August. When branches die back from
fire blight, cut them off several inches below the
visible blighted portion.
Septobasidium
spp.,
Southeast and Gulf states.
L
EAF
S
POT
. Cercospora apiifoliae, TX;
Cercosporella mirabilis, CO, NY, WI;
Coniothyrium pyrinum, IL;
Cylindrosporium brevispina, CA to MT,
WA; C. crataegi, WA; Gloeosporium
crataegi, WA; Hendersonia crataegicola,
AL, TX; Monochaetia crataegi, FL;
Phyllosticta spp., widespread; Septoria
crataegi, MI to ND; Mycosphaerella sp., GA.
M
ISTLETOE
. Phoradendron serotinum
(flavescens), TX; Viscum album, CA.
P
OWDERY
M
ILDEW
. Podosphaera oxyacanthae,
East and central states; Phyllactinia corylea,
general.
R
OT
, Gray Mold, on fruit. Botrytis cinerea, AK.
R
OT
, Root. Armillaria mellea, OK;
Phymatotrichum omnivorum, TX. Xylaria
digitata; X. hypoxylon, IN, OH.
R
OT
, Wood. Daedalea confragosa, cosmopoli-
tan; Polyporus versicolor, cosmopolitan;
Fomes spp.
R
UST
. Gymnosporangium bethelii (0, I), on
fruits; ND to WA, CO, NM; III on juniper;
Hazelnut, Filbert (Corylus)
B
ACTERIAL
Blight. Xanthomonas corylina, OR,
WA; Pseudomonas syringae pv. coryli.
B
ACTERIAL
Crown
Gall.
Agrobacterium
tumefaciens,WA.
B
ACTERIAL
Spot. Pseudomonas colurnae, IL.
B
LIGHT
,
Eastern
Filbert.
Anisogramma
anomala, NJ, NY, OR, WA.
C
ANKER
; Twig Blight. Apioporthe anomala,
eastern and central states; Hymenochaete
agglutinans, ME; Gleosporium sp.
F
ILBERT
S
TUNT
. Undetermined causal agent, OR.
K
ERNEL
S
POT
; Yeast Spot. Nematospora coryli,
OR.
L
EAF
B
LISTER
. Taphrina coryli, CT, MA, WI.
L
EAF
S
POT
. Cercospora corylina, OK;
Cylindrosporium vermiforme, WI;
Gloeosporium coryli, ME to NJ, OR, PA,
WA; Phyllosticta coryli, widespread;
Septogloeum profusum, IN, MA, MS;
Septoria corylina, MA to NJ, OR, WA, WI;
