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,
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