Biology Reference
In-Depth Information
Drechslera stenacra (formerly
Helminthosporium stenacrum
).
Leaf Mold
on
redtop and bent grasses. Indefinite spots; leaves
dry, withered, in fall.
Drechslera triseptata (formerly
Helminthosporium triseptatum
).
Leaf Spot
,
Gray
Leaf Mold
on redtop, spike and bentgrasses in
Oregon, Washington, and New York. Leaf tips
are killed with vague lesions; gray mold appears
on dying tissue.
Drechslera tritici-repentis (formerly
Helminthosporium tritici-repentis
).
Leaf Spot
on Russian wildrye (
Elymus
).
Exserohilum rostratum (formerly
Helminthosporium rostratum
).
Leaf Spot
on
bromelia, areca palm, fishtail palm, rhapis palm,
sweet sorghum, and
Chamaedorea
spp.
Helminthosporium
Helminthosporium siccans; Teleomorph,
Pyrenophora lolii
(see
Drechslera siccans
).
Brown Blight
on fescue, and ryegrass.
Helminthosporium
▶
sorokiniana
(see
Bipolaris sorokiniana
).
Leaf Spot
and
Stem
Spot
of wild rice.
Leaf and Pod Spot
on bean.
Helminthosporium
▶
stenacrum (see
Drechslera stenacra
).
Leaf Mold
on redtop
and bent grasses.
Helminthosporium
▶
triseptatum (see
Drechslera triseptata
).
Leaf Spot
,
Gray Leaf
Mold
on redtop, spike and bentgrasses in Oregon,
Washington, and New York.
Helminthosporium
▶
tritici-repentis (see
Drechslera tritici-repentis
).
Leaf Spot
on
Russian wildrye (
Elymus
).
Helminthosporium vagans
▶
Drechslera
poae
).
Bluegrass Leaf Spot
,
Going-Out
,
Melting-
out
,
Foot Rot
, general but most injurious in north
eastern states, on bluegrass only.
(see
▶
catenarium (see
Drechslera catenaria
).
Leaf Spot
on ribbon-
grass.
Helminthosporium
▶
cynodontis (see
Bipolaris cynodontis
).
Bermuda Grass Leaf
Blotch
, general in South.
Helminthosporium
▶
Hendersonia
dictyoides
(see
Deuteromycetes, Coelomycetes
Drechslera dictyoides
).
Fescue Net-blotch
,
general on fescue.
Helminthosporium
▶
erythrospilum (see
Pycnidia smooth, innate or finally erumpent,
ostiolate; conidia dark, several-celled, elongate
to fusoid; saprophytic or parasitic.
Hendersonia
Drechslera erythrospilum
).
Red Leaf Spot
on
redtop and bent grasses, widespread in eastern
and Midwestern states.
Helminthosporium
▶
concentrica
Leaf
Spot
on
rhododendron.
Hendersonia crataegicola
Leaf Spot
on haw-
thorn. Spots irregular, dark brown.
giganteum (see
Drechslera giganteum
).
Zonate Leaf Spot
,
Eye Spot
on bent grasses, Canada and Kentucky
bluegrass, and Bermuda grass.
Helminthosporium
▶
rostratum (see
Cladosporium (Heterosporium)
Exserohilum rostratum
).
Leaf Spot
on
bromelia, areca palm, fishtail palm, rhapis palm,
sweet sorghum, and
Chamaedorea
spp.
Helminthosporium sativum (see
▶
Deuteromycetes, Hyphomycetes
Bipolaris
sorokiniana
).
Melting-out
, prevalent on bent grass
in warm weather.
Leaf Spot
on Russian wildrye
(
Elymus
);
Spot Blotch
on switchgrass (
Panicum
).
Helminthosporium
▶
Conidiophores dark, simple; conidia dark, spiny,
cylindrical, with three or more cells; parasitic,
causing leaf spots, or saprophytic.
Acroconidiella escholtziae (formerly
Heterosporium escholtziae
).
Capsule Spot
,
Leaf
Spot
,
Stem Spot
of California poppy. Lesions
faint purplish brown; seed capsules may shrivel.
Treat seed with hot water, 125
F, for 30 min.
setariae (
Drechslera
setariae
) (see
▶
Bipolaris setariae
).
Leaf and
Petal or Greasy Spot
on geranium, areca palm,
fishtail palm, rhapis palm,
Calathea
spp.
Maranta
spp., and
Chamaedorea
spp.
