Biology Reference
In-Depth Information
Thelephora
Volutella
Basidiomycetes, Aphyllophorales
Deuteromycetes, Hyphomycetes
Fruiting body leathery, upright, stalked; pileate or
fan-shaped or much lobed, or in an overlapping
series; hymenium on the underside, smooth or
slightly warty; spores one-celled.
Thelephora spiculosa
Stem Blight
found on
azalea, fern, and other ornamentals in a Maryland
garden. The fungus formed a dense weft of myce-
lium on surface of the soil and on plants.
Thelephora terrestris
Seedling Blight
,
Smother
.
The mycelium ramifies in the soil, and the leathery
fruiting body grows up around the stemof a seedling
conifer or deciduous tree, smothering it or strangling
it without being actually parasitic on living tissue.
The disease occurs most often in crowded stands in
nurseries. The damage is seldom important.
Sporodochia discoid, with marginal dark setae;
conidiophores usually simple, in a compact pali-
sade; conidia hyaline, one-celled, ovoid to
oblong; parasitic or saprophytic (see
Fig. 1
).
Pseudonectria
pachysandricola (see
Volutella pachysandrae
, Telemorph).
Pachy-
sandra Leaf
and
Stem Blight
. Large areas of
leaves turn brown to black, along with portions
of stems, and in wet weather numerous pinkish
spore pustules appear along stems.
Volutella buxi
Boxwood Leaf Blight
,
Nectria
Canker
. Pinkish spore occur as pustules on leaves
and twigs. Leaves often turn straw-colored. See
further under
▶
Cankers and Diebacks
.
Volutella pachysandrae (formerly,
Pseudonectria pachysandricola
).
Pachysandra
Leaf
and
Stem Blight
. Large areas of leaves turn
brown to black, along with portions of stems, and
in wet weather numerous pinkish spore pustules
appear along stems. The blight is most serious
when pachysandra has been injured or is too
crowded or is kept too moist by tree leaves falling
into the bed. Spraying once or twice with bor-
deaux mixture gives excellent control if severely
blighted plants have been removed before treat-
ment. Keep pachysandra thinned and sheared
back periodically.
▶
Tryblidiella
Ascomycetes, Patellariales
Apothecia opening by a wide cleft; spores dark,
cylindrical, with several cells.
Rhytidhysteron rufulum (formerly
Tryblidiella rufula
).
Twig Blight
on citrus.
Tryblidiella
rufula (see
Rhytidhysteron
▶
rufulum
).
Twig Blight
on citrus.
