Biology Reference
In-Depth Information
one-celled hyaline, fusiform, surrounded by
a gelantinous sheath (see Fig. 1 , chapter
Hyponectria
Nee-
dle Casts ) .
Hypoderma
Ascomycetes, Hypocreales,
Nectriaceae
Ploidoderma
lethale ). Gray Leaf Blight of hard pines, from
New England to the Gulf States.
Ploioderma lethale (formerly Hypoderma
lethale ). Gray Leaf Blight of hard pines,
from New England to the Gulf States.
Hysterothecia are short, narrow, black; often
seen on pitch pine.
lethale
(see
Perithecia bright colored, soft; innate or finally
erumpent; paraphyses lacking; spores one-celled,
light-colored, oblong.
Hyponectria buxi Leaf Blight , Leaf Cast of
boxwood.
Itersonilia
Hypodermella
Deuteromycetes, Hyphomycetes
Ascomycetes, Rhytismatales
Cells reproducing by budding and germinating by
repetition; clamp connections as in Basidiomy-
cetes
Like Hypoderma but one-celled spores are club-
shaped at upper end, tapering toward base (see
Fig. 1 , chapter
and
probably
anamorph
species
of
Needle Casts ).
Hypodermella abietis-concoloris (see
Tremellales . The genus is not well understood.
Itersonilia perplexans Petal Blight of chrysan-
themum and China aster. The fungus was isolated
fromgreenhouse chrysanthemums inMinnesota in
1951 but apparently has been present, as a parasite
or saprophyte, on many other plants. On pompom
chrysanthemums the tip half of outer petals turns
brown and dries; the diseased tissue is filled with
broad hyphae and clamp connections. Inoculated
snapdragons show similar symptoms. Adequate
greenhouse ventilation seems to prevent trouble.
This fungus has also been reported on dill.
Itersonilia sp. Leaf Blight , Canker of parsnip,
seasonal in New York and neighboring states.
Plants are defoliated in cool, moist weather.
Spores from leaves produce a chocolate brown
dry rot on shoulder or crown of the root. Good
drainage and long rotation aid in control.
Lirula
abietis-concoloris ). Fir Needle Blight on firs and
southern balsam.
Hypodermella laricis Larch Needle and Shoot
Blight . Yellow spots are formed on needles,
which turn reddish brown but stay attached, giv-
ing a scorched appearance to trees. Hysterothecia
are very small, oblong to elliptical, dull black, on
upper surface of needles.
Lirula abietis-concoloris (formerly
Hypodermella abietis-concoloris ). Fir Needle
Blight on firs and southern balsam.
Nectria (Hypomyces)
Ascomycetes, Hypocreales
Perithecia bright colored with a subicle (crustlike
mycelial growth underneath); spores two-celled,
light, with a short projection at one end.
Hypomyces
Kellermannia
Deuteromycetes, Coelomycetes
ipomoeae
(see
Nectria
ipomoeae ). Twig Blight of bladdernut.
Nectria ipomoeae (formerly Hypomyces
ipomoeae ). Twig Blight of bladdernut.
Pycnidia black, globose, separate; immersed in
host tissue; ostiolate; conidiophores short, sim-
ple;
conidia
hyaline, mostly
two-celled,
 
 
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