Biology Reference
In-Depth Information
B
ACTERIAL
Crown Gall. Agrobacterium
tumefaciens, widespread. Japanese apricot
(
Prunus mume
) is resistant.
B
ACTERIAL
Fire Blight. Erwinia amylovora, CO,
FL, NE, PA, TX.
B
ACTERIAL
Leaf Spot. Xanthomonas pruni,ILto
TX, NE.
B
LACK
K
NOT
. Dibotryon morbosum, CO, IA,
NY.
B
LIGHT
, Blossom, Twig; Brown Rot. Monilinia
laxa, Pacific Coast states.
B
LIGHT
, Shoot; Shot Hole; Fruit Spot. Coryneum
carpophilum, wide-spread; Monilinia laxa,
MA, NY, RI.
C
ANKER
, Felt Fungus. Septobasidium pseudope-
dicellatum, MS.
C
ANKER
, Trunk. Phytophthora cactorum, CA;
P. citrophthora, CA.
C
ANKER
, Trunk and Limb Gall. Monochaetia
rosenwaldia, CA.
C
ANKER
, Twig; D
IEBACK
. Cytospora spp., AZ,
NY; Valsa leucostoma, MO, TX;
Cytosporina Dieback, Eutypa armeniaceae
(syn. E. lata), CA; Ceratocystis fimbriata,
CA.
C
ANKER
; D
IEBACK
;
Little Leaf. Zinc deficiency, CA, OR, WA.
Mottle Leaf. Manganese deficiency, CA.
P
OWDERY
M
ILDEW
. Podosphaera oxyacanthae,
CA, IA; Sphaerotheca pannosa, CA, NY.
R
OT
, Blossom End; Fruit Spot. Alternaria sp.,
and A. citri CA.
R
OT
, Brown; Blossom Blight. Monilinia
fructicola, widespread on ripe fruit.
R
OT
, Green Fruit; Gummosis. Botrytis cinerea,
CA.
R
OT
, Green Fruit; Twig Blight. Sclerotinia
sclerotiorum, CA; Lambertella pruni, CA.
R
OT
, Heart. Schizophyllum commune, after
freezing, TX, WA; Trametes hispida, CO.
R
OT
, Mushroom Root. Armillaria mellea, CA,
TX; Clitocybe tabescens, FL.
R
OT
, Root. Phymatotrichum omnivorum, AZ,
OK, TX.
R
OT
, Silver Leaf. Stereum purpureum, CA.
R
UST
. Tranzschelia discolor and T. pruni
(II, III), CA, MS, NM, TX.
S
CAB
; Freckle; Twig Canker. Cladosporium
carpophilum, wide spread.
V
IRUS
. Apricot Gummosis,WA;Apricot
Pucker Leaf, UT; Apricot Ring Pox, CA,
CO, WA; Peach Mosaic, Southwest; Peach
Phony, GA; Peach Ring Spot, western U.S.;
Peach Rosette; Peach Yellow Bud Mosaic,
CA; Peach Yellows, occasional in East; Stem
Pitting.
W
ILT
. Verticillium albo-atrum,CA,UT,WA.
Apricots are very susceptible to Armillaria
root rot and should be on resistant Myrobalan
rootstock. Bacterial canker is an epidemic dis-
ease in many seasons, with activity starting in
late autumn, ceasing in early summer. Sprays
are usually needed in California for zinc defi-
ciency, brown rot, green or jacket rot, and shot
hole.
Coral
Spot.
Nectria
cinnabarina, IN, WA.
F
RUIT
S
POT
.
Venturia
cerasi
(See
under
SCAB
).
L
EAF
C
URL
. Taphrina deformans, SC.
L
EAF
S
POT
. Cercospora circumscissa, TX;
Coccomyces sp., CA, MA, TX, VT;
Phyllosticta circumscissa, CA.
N
EMATODE
, Dagger. Xiphinema sp., WV, NY.
N
EMATODE
, Lesion. Pratylenchus vulnus, CA;
P. penetrans, NY.
N
EMATODE
, Root Knot. Meloidogyne
▶
sp., AZ,
TX.
N
ONPARASITIC
. Arsenical Injury, from accumula-
tion in soil, CA.
Chlorosis, alkali injury. Mineral deficiency, AZ,
CA.
Exanthema. Copper deficiency, CA.
Gummosis, Sour Sap. Adverse soil and moisture
conditions, AZ, CA, NJ, WA.
Internal Browning, Fruit Cracking. Boron defi-
ciency, WA.
Aquatic Plants (Caboriaba sp.,
Limnophila sp., Replis diandra, and
Potamogeton sp.)
N
EMATODE
, Foliar. Aphelenchoides fragariae,
FL.
