Biology Reference
In-Depth Information
B
LIGHT
, Leaf. Alternaria cucumerina, DE, MN,
NJ, NY, NC, UT; Phytophthora capsici, also
stem rot, fruit rot, AR, CA, IL, NM, NC, TX.
B
LIGHT
, Southern.
Spurge Leafy (Euphorbia escula)
L
EAF
S
POT
; Blight. Alternaria angustiovoidea.
R
OT
, Crown and Root. Fusarium oxysporum;
F. solani; F. proliferatum, MT.
Sclerotium rolfsii, AL,
FL, GA.
B
LIGHT
, Stem. Fusarium tabacinum
(
Plectosporium tabecinum
), AL, IL, NY, TN.
D
AMPING
-O
FF
. Pythium debaryanum, CT, WI.
D
OWNY
M
ILDEW
. Pseudoperonospora cubensis,
ME to AL, CA, IA, LA, TX.
L
EAF
N
ECROSIS AND
T
WIG
C
ANKER
. Pseudomonas
syringae, Pseudomonas marginolis, Quebec,
Canada.
L
EAF
S
POT
. Ascochyta sp.; Cercospora
cucurbitae, AL, DE, NJ, WI; C. citrullina,
AL; Gloeosporium sp., IL; Phyllosticta
cucurbitarum, IN, NY; P. orbicularis, DE,
PA, NY; Septoria cucurbitacearum,
Spurge, Painted (Euphorbia
heterophylla)
C
ANKER
, Stem. Diaporthe phaseolarum
var. caulivora, LA; pathogen of soybean
stem canker.
R
UST
. Uromyces euphorbiae (0, I, II, III), IN to
FL, KS, TX.
S
MUT
, Stem. Tilletia euphorbiae, LA.
V
IRUS
. Euphorbia Mosaic, FL.
IL,
MA,
NY,
WI;
Stemphylium
cucurbitacearum, IN, OH.
M
OLD
, Seed. Alternaria tenuis, cosmopolitan;
A. radicina, occasional; Curvularia trifolii,
CT.
N
EMATODE
, Root Knot. Meloidogyne spp., MD to
FL, TX.
N
EMATODE
, Stubby Root. Trichodorus christiei.
N
ONPARASITIC
. Blossom-End Rot. On summer
squash when hot, dry weather follows a cool,
rainy spell.
Chlorosis. Nutrient deficiency: manganese,
interveinal chlorosis, nitrogen, leaf yellowing
and chlorosis of bud end of fruit.
Bronzing. Marginal Necrosis; Fruit Deformity.
Potassium deficiency.
P
OWDERY
M
ILDEW
. Golovinomyces
cichoracearum, general; Sphaerotheca
fuliginea, CA, IN, MI, NY, NC.
R
OT
,
Spurge, Prostrate (Euphorbia supina)
C
ANKER
, Girdling Stem; Gray Mold. Amphobotrys
ricini, FL, LA, MD, MS, OK, TX.
Spurge, Spotted (Euphorbia maculata)
N
EMATODE
, Root Knot. Meloidogyne hapla.
Squash and Pumpkin (Cucurbita)
A
NTHRACNOSE
. Colletotrichum lagenarium,CT
to NJ, KS, TX.
B
ACTERIAL
, MLO. Aster Yellows.
B
ACTERIAL
Soft Rot. Erwinia carotovora
pv.
carotovora, cosmopolitan; E. aroideae.
B
ACTERIAL
Spot. Xanthomonas cucurbitae, CT,
GA, IL, IN, MD, MA, MI, WA, WI; Pseudo-
monas syringae pv. lachrymans; P. syringae
pv. syringae, GA.
B
ACTERIAL
Wilt. Erwinia tracheiphila, NM.
B
LIGHT
, Blossom. Choanephora cucurbitarum,
brown rot of fruit, ME to FL, MI, OK, TX.
B
LIGHT
, Gummy Stem; Black Rot of Fruit.
Mycosphaerella citrullina (
M. melonis
),
CT, FL, GA, MA, MI, NJ, NY.
Blossom-end;
Root,
Pythium
aphanidermatum, AZ, CA, MD.
R
OT
, Charcoal. Macrophomina phaseolina, OR,
TX.
R
OT
, Fruit. Acidiovorax avenae (syn. Pseudo-
monas pseudoalcaligenes subsp. citrulli),
GA; Alternaria sp., MA, NH, NJ, NY, OR,
VT, WA; Diplodia natalensis, TX;
Coniosporium fairmani, black mold; Botry-
tis cinerea, gray mold; Fusarium spp.;
F. solani, AR, F. solani
f. sp.
cucurbitae,