Biology Reference
In-Depth Information
citrophthora, CA; P. citricola, CA; Rhizo-
pus nigricans; Alternaria sp.; Fusarium sp.
R
OT
,
B
LIGHT
, Shoot and Stem. Phytophthora
citrophthora, P. citricola, P. nicotianae var.
parasitica, FL, OH.
B
LIGHT
, Thread. Pellicularia koleroga, LA.
C
ANKER
, Stem. Gloeosporium sp., OR.
Phomopsis sp., SC.
D
AMPING
-O
FF
, Leaf Blight. Rhizoctonia solani,
cosmopolitan.
D
ODDER
. Cuscuta sp., FL, SC.
G
ALL
, Leaf; Shoot Hypertrophy. Exobasidium
vaccinii, general; E. burtii, Yellow Leaf
Spot, ID, NJ, OR, WA; Synchytrium
vaccinii, NJ.
L
EAF
S
CORCH
; Angular Leaf Spot. Septoria
azaleae, widespread; severe in CA.
L
EAF
S
POT
. Cercospora rhododendri, MD;
Pestalotia spp., general but secondary;
Phyllosticta sp.; Ramularia angustata, MS,
NY; Colletotrichum azaleae, FL; Septoria
solitaria, CA, OR, TX; Tar Spot, Melasmia
menziesii,WA;Corynespora cassiicola,
GA, FL.
N
EMATODE
, Leaf. Aphelenchoides fragariae, FL.
N
EMATODE
, Root Knot. Meloidogyne incognita.
N
EMATODE
, Spiral. Helicotylenchus nannus;
Rotylenchus robustus.
N
EMATODE
, Stubby Root. Paratrichodorus
christiei; Trichodorus primitivus.
N
EMATODE
, Stunt. Tylenchorhynchus claytoni.
N
ONPARASITIC
. Chlorosis. Usually iron defi-
ciency, general in alkaline soils, sometimes
defective drainage.
P
OWDERY
M
ILDEW
. Erysiphe azaleae, LA;
Erysiphe polygoni, CA, NJ; Microsphaera
alni, GA, NJ, NY, PA, RI, VA.
R
OT
, Root. Armillaria mellea, CA, NJ, WA;
Clitocybe tabescens, FL; Phymatotrichum
omnivorum,
Postharvest
Stem.
Pestalotiopsis
clavispora, Chile.
R
OT
, Root. Armillaria mellea, CA; Clitocybe
tabescens,
FL;
Phymatotrichum
omnivorum,
TX;
Dematophora
Rot,
Rosellinia necatrix.
R
OT
, Root; Decline. Phytophthora cinnamomi,
CA; Pythium spp., CA.
R
OT
, Seed and Root. Rhizoctonia solani, CA.
S
POT
A
NTHRACNOSE
; Scab. Sphaceloma perseae,
FL, TX.
V
IROID
. Avocado
Sunblotch, Michoacan,
Mexico.
V
IRUS
. Avocado Sun Blotch, CA; Avocado 3
Alphacryptovirus., CA, black streak.
W
ILT
. Verticillium albo-atrum, CA, FL;
Raffaelea lauricola, FL.
W
ILT
,
Laurel.
Raffaelea
lauricola;
R. canadensis, CA, FL.
W
ILT
, Root. Neonectria radicicola, CA.
Avocado scab may cause heavy damage in
susceptible varieties of West Indian stock.
Cercospora blotch attacks both leaves and
fruit. Decline, root rot, is most serious in wet
soils, killing trees if they are waterlogged 6 to
8days.
Azalea (Rhododendron)
A
NTHRACNOSE
. Colletotrichum sp., LA.
B
LIGHT
, Bud
and Twig.
Briosia
azaleae
(
Pycnostysanus
), MA, NH, NJ, NC.
B
LIGHT
, Cutting. Cylindrocladium scoparium,
AL, FL, NY, OH; C. floridanum.
B
LIGHT
, Flower; Seedling. Botrytis cinerea,
often after frost, cosmopolitan; Alternaria
tenuis;
TX;
Pythium
spp.;
Phytophthora lateralis, NC.
R
OT
, Root and Stem; Wilt. Phytophthora
cinnamomi, AL, MD, MO.
R
UST
. Pucciniastrummyrtilli (II, III), ME to FL,
TX; 0, I on hemlock.
V
IRUS
. Tomato Spotted Wilt, PA.
W
ILT
. Cylindrocarpon radicicola,MA.
Azalea flower spot or petal blight
devastates azalea blooms in the South in rainy
Cladosporium
herbarum;
Epicoccum purpurascens.
B
LIGHT
, Foliar. Phytophthora foliarum, TN.
B
LIGHT
, Petal; Flower Spot. Ovulinia azaleae,
AL, CA, FL, GA, LA, MD, MS, NC, PA,
SC, TX, VA; also NY, NJ in greenhouses.
B
LIGHT
, Shoot. Monilinia azaleae, GA, MA, NY.
