Biology Reference
In-Depth Information
L
EAF
S
POT
. Alternaria spp., cosmopolitan;
Cladosporium herbarum, cosmopolitan but
secondary; Heterosporium sp., MD;
Stemphylium sp., leaf and stem spot, FL,
MI, NJ, NY.
N
EMATODE
, Root Knot. Meloidogyne spp., NC to
FL, TX; M. hapla.
N
EMATODE
, Sheath. Hemicycliophora oracilis,
OR.
N
ONPARARASITIC
Leaf Scorch. Atmospheric fluo-
rides, WA.
Brown Tip. From waterlogged soil.
Ink Spot. On husks and corms. Cause unknown.
“Rust.” Spot necrosis on leaves, from sun on
water drops.
Topple. Partially controlled by spraying flowers
with calcium nitrate.
R
OT
, Corm, Basal; Yellows; Wilt. Fusarium
oxysporum f. sp. gladioli, general.
R
OT
, Dry, of corms; Leaf and Stalk Rot.
Stromatinia gladioli, general.
R
OT
, Hard; Leaf Spot. Septoria gladioli, general.
R
OT
, Root, Collar, Leaf Base. Rhizoctonia
solani, NJ, ND, TX.
R
OT
, Storage. Penicillium gladioli, general in the
North, occasional in the South;
P. funiculosum, core rot; Rhizopus arrhizus,
soft, occasional.
R
UST
, Uromyces transversalis, Mexico
(Michoacan), CA, FL.
S
MUT
. Urocystis gladiolicola, CA.
V
IRUS
. Cucumber Mosaic; Yellow BeanMosaic
(mild mosaic); White Break, NY to IL, CA,
WA; Tomato Ring Spot.
The backyard gardener with a few rows of glad-
iolus probably sprays for thrips and forgets about
diseases, but the serious grower has much to com-
bat. Control starts with choosing varieties resistant
to Fusarium yellows, treating corms after digging
and before planting to control rots and scab, with
removal of husks usually giving a healthier crop,
and field spraying for Botrytis, Curvularia, and
Stemphylium flower blights and leaf spots. Mild
mosaic is spread from beans to gladiolus by aphids;
so they should be kept widely separated. Rogue
plants with white-break mosaic. An aluminum
mulch repels aphid vectors of virus diseases.
Globe-Amaranth (Gomphrena)
L
EAF
S
POT
.
Cercospora gomphrenae, GA,
OK, TX.
N
EMATODE
,RootKnot.Meloidogyne sp., FL.
V
IRUS
. Beet Curly Top, TX; Tomato Spotted
Wilt-Impatiens Serotype, FL, GA.
W
HITE
R
UST
. Albugo bliti,NM.
Globe-Mallow (Sphaeralcea)
P
OWDERY
M
ILDEW
. Erysiphe polygoni, ID.
R
UST
. Puccinia interveniens, ID, WA;
P. schedonnardi, AZ, NM; P. sherardiana,
AZ, CA, CO, ID, NE, NM, TX, UT, WY;
P. sphaeralceae (I, III), CA.
Globe-Thistle (Echinops)
R
OT
, Crown. Sclerotium rolfsii, CT.
R
OT
, Root. Phytophthora cryptogea, NC.
Glory-Bush (Tibouchina)
R
OT
, Mushroom Root. Clitocybe tabescens,
FL.
Gloxinia (Sinningia)
B
ACTERIAL
Leaf Blight. Pseudomonas sp., OR.
B
ACTERIAL
Leaf Spot. Pseudomonas alcaligenes,
FL.
B
ACTERIAL
, MLO. Aster Yellows, CA.
B
LIGHT
, Bud Rot. Botrytis cinerea, CA, MO.
N
ONPARASITIC
. Dieback Wilt; Boron deficiency,
CA.
R
OT
, Crown; Flower, Leaf Blight. Sclerotinia
sclerotiorum, CA.
R
OT
, Leaf. Cladosporium herbarum, NJ.
R
OT
, Root and Crown. Phytophthora cryptogea,
CA; P. tropicalis, NC; Pythium ultimum,
CA; Myrothecium roridum, FL.
