Biology Reference
In-Depth Information
B LIGHT , Southern. Sclerotium rolfsii, CA.
R OT , Corm. Fusarium oxysporum f. sp. gladioli,
yellows; Stromatinia gladioli, in commercial
stocks.
V IRUS . Iris Mosaic, CA, OR.
R OT , Root. Pythium debaryanum, TX; Rhizoc-
tonia solani, NC.
Tulip (Tulipa)
Trollius (Globeflower)
A NTHRACNOSE . Gloeosporium thuemenii f. sp.
tulipi, CA.
B ACTERIAL Soft Rot. Erwinia carotovora,WA.
B LIGHT , Botrytis; Tulip Fire. Botrytis tulipae,
general except for South and Southwest;
B. cinerea, sometimes secondary.
B LIGHT , Southern; Bulb and Stem Rot. Sclero-
tium rolfsii, CA, CT, NY, OR.
N EMATODE , Bulb. Ditylenchus dipsaci, NY.
N ONPARASITIC . Chalking, stone disease. Immatu-
rity of bulbs or injury at digging.
Topple, Sugarstem. Collapse of flower stem,
often from calcium deficiency.
R OT , Basal. Fusarium sp., OK, WA.
R OT , Black. Sclerotinia sclerotiorum,WA.
R OT , Bulb. Penicillium spp., blue mold; Asper-
gillus spp., black mold, cosmopolitan; Rhizo-
pus stolonifer, mushy rot, cosmopolitan;
Sclerotinia sp., ME, OH, WA; S. sativa,
MD, NY; Pythium ultimum, secondary.
R OT , Gray Bulb. Rhizoctonia tuliparum, North-
east, Pacific states.
R OT , Root, Stem, Bulb. Rhizoctonia solani, MA,
NY, WA.
R OT , Stem; Flower Spot. Phytophthora
cactorum, CA, IA, NJ, PA, SC, WA.
V IRUS . Tulip Breaking (Lily Latent Mosaic and
Tulip Color-adding),
L EAF S POT . Ascochyta sp., NY;
Cylindrosporium montenegrinum, WY;
Phyllosticta trollii,WY.
S MUT , Leaf and Stem. Urocystis anemones, MD,
NY.
Tropical Soda Apple (Solanum viarum)
N EMATODE , Root Knot. Meloidogyne arenaria,
FL.
Trumpetvine, Trumpet-Creeper
(Campsis)
L EAF S POT . Cercospora duplicata, LA;
Mycosphaerella tecomae ( Cercospora
sordida ), general; Phyllosticta tecomae,
MS; Myrothecium roridum, TX; Septoria
tecomae, OK, TX, WV.
M ISTLETOE .
Phoradendron
serotinum
(flavescens), TX.
P OWDERY M ILDEW . Golovinomyces
cichoracearum, IL; Microsphaera alni,
MD to AL, IN, TX.
R OT , Root. Phymatotrichum omnivorum, TX.
general;
Tobacco
Necrosis, WI.
Botrytis blight is extensive with tulips. In
a wet spring, leaves are blasted, buds blighted,
and open flowers covered with spots, followed
by the familiar gray mold. Sanitary measures
are all-important, for the sclerotia survive in
the soil, ready to blight new, healthy bulbs.
Cut off fading flowers into a paper bag. Gradual
running out of tulips may be due to virus dis-
ease. Breaking of flowers, once considered
a desirable ornamental character, is now recog-
nized as a disease that may be harmful in the
Tuberose (Polianthes)
B ACTERIAL Soft Rot. Erwinia carotovora, NC.
B LIGHT , Leaf and Flower Spot. Botrytis elliptica,
CA.
L EAF S POT . Cercospora sp., TX;
Helminthosporium sp., also stem spot, TX.
N EMATODE , Root Knot. Meloidogyne
sp., CA,
FL, NC, TX, VA.
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