Biology Reference
In-Depth Information
Sand Burn of Seedlings. High temperature.
P
OWDERY
M
ILDEW
. Microsphaera
Pecan (Carya illinoensis)
alni,
occasional.
R
OT
, Heart. Schizophyllum commune, after
drought injury, OK.
R
OT
, Kernel
A
NTHRACNOSE
. Glomerella cingulata, GA.
B
ACTERIAL
Crown
Gall.
Agrobacterium
tumefaciens, widespread.
B
LIGHT
,Thread.Pellicularia koleroga,FL,NC.
B
LOTCH
, Leaf. Mycosphaerella dendroides,
South.
C
ANKER
. Cytospora sp., AZ.
C
ANKER
; Black Bark
and
Shuck.
Phytophthora
cactorum, GA.
R
OT
, on nuts. Aspergillus chevalieri, storage
mold; Trichothecium roseum, pink mold.
R
OT
,
Root.
Armillaria mellea,
CA;
Spot. Myriangium
Helicobasidium
purpureum,
TX;
tuberculans, GA, MS.
C
ANKER
; D
IEBACK
. Botryosphaeria
berengeriana, AZ, SC, to FL.
C
ANKER
,
Phymatotrichum
omnivorum,
TX;
Pestalotia uvicola, FL, TX;
Clitocybe
tabescens, GA.
S
CAB
. Cladosporium effusum, general.
S
POT
A
NTHRACNOSE
; Nursery Blight. Elsino¨
randii, southeastern and Gulf states.
V
IRUS
. Bunch Disease. Undetermined.
Pecan scab is the limiting factor in nut pro-
duction in southeastern states, with strains of
the fungus sometimes attacking varieties long
considered immune; four or five sprays are
required for control. In Arizona severe infection
from Phymatotrichum root rot has come where
trees are intercropped with lucerne, which pro-
vides a rapid transit medium for the fungus.
Getting rid of the lucerne and treating with
ammonium sulfate saves some trees. Zinc sul-
fate, added to the soil or to foliar sprays, con-
trols rosette.
Stem.
Microcera
(
Fusarium
)
coccophila, LA, TX.
L
EAF
S
CORCH
,F
UNGAL
. Xylella fastidiosa,
Pestalotia, Epicoccum, Curvularia, Fusar-
ium, LA.
L
EAF
S
POT
. Microstroma juglandis,GAto
TX; Phyllosticta convexula, OK;
Septoria caryae, TX; Pestalotia uvicola,
FL, TX.
L
EAF
S
POT
, Algal. Cephaleuros virescens, FL.
L
EAF
S
POT
, Brown. Cercospora fusca, prevalent
through pecan belt.
L
EAF
S
POT
; Downy Spot. Mycosphaerella
caryigena, GA and FL to TX.
L
EAF
S
POT
; Liver Spot. Gnomonia caryae var.
pecanae, AL, AR, GA, LA, MS, TX.
L
EAF
S
POT
; Vein Spot. Gnomonia nerviseda,
AR, IL, LA, MS, TX.
L
EAF
S
POT
; Zonate. Cristulariella pyramidalis,
AL.
M
ISTLETOE
. Phoradendron serotinum
(flavescens), widespread Gulf states.
N
EMATODE
. Paratylenchus sp.; Trichodorus sp.
N
EMATODE
, Awl. Dolichodorus obtusus.
N
EMATODE
, Dagger. Xiphinema americanum,
Southeast.
N
EMATODE
, Root Knot. Meloidogyne
Pennisetum
B
ACTERIAL
S
TRIPE
. Acidovorax avenae subsp.
avenae, GA.
B
LACK
C
HOKE
D
ISEASE
. Ephelis sp., MD.
B
LIGHT
, Basal Leaf. Waitea circinata
var.
prodigus, CA.
L
EAF
S
POT
. Helminthosporium giganteum, MD;
Phyllosticta penicillariae, GA; also stunt and
chlorosis; Gaeumannomyces graminis var.
graminis (also yellowing), CA.
L
EAF
S
POT
, Gray. Pyricularia grisea, CA.
S
MUT
, Seed. Ustilago penniseti,VA.
V
IRUS
. Maize Chlorotic Dwarf Virus, OH.
spp.;
M. incognita; M. partityla, FL, GA.
N
ONPARASITIC
. Black Pit; Kernel Spot. Feeding
punctures of plant bugs.
Leaf Scorch. Low fertility and soil moisture
capacity.
Rosette. Zinc deficiency.
