Biology Reference
In-Depth Information
Cytospora leucostoma
Canker
of black cherry.
Cytospora nivea
Canker, Dieback
of poplar
and willow, similar to that caused by
C.
chrysosperma
; occasional.
Cytospora leucosperma
Branch Canker
of
elder.
Cytospora sp.
Canker
on alder and pecan.
Cytospora spp.
Cytospora Canker
of Italian
Prunce, causing severe injury to prune and apri-
cot in Idaho orchards since 1951, also present on
cherries, peach, apple and willows.
Some orchards have been lost, others hard hit.
Symptoms are yellow to brown flags of dead
leaves and erumpent, gummy cankers or elon-
gated necrotic streaks in the bark. All suspicious
wood should be cut out, hauled out of the orchard,
and burned.
▶
Dasyscyphus pseudotsugae (see
Lachnellula
pseudotsuga
).
Canker
on Douglas-fir. Swollen
open cankers, 2 to 3 inches long, are formed on
suppressed saplings.
Dasyscyphus
▶
Lachnellula
resinaria
).
Canker
on balsam fir. Swollen cankers
at base of branches; younger stems girdled and
killed.
Dasyscyphus willkommii (see
resinaria (see
▶
Lachnellula
willkommii
(
Trichoscyphella willkommii
syn.
Lachnellula wilkommii
)).
European Larch Can-
ker
. Found in Massachusetts in 1927 on nursery
stock from Great Britain.
Lachnellula agassizi (formerly
Dasyscyphus
agassizi
). Common on blister-rust lesions of
white pine; saprophytic on dead branches.
Lachnellula pseudotsuga (formerly
Dasyscyphus pseudotsugae
).
Canker
on Doug-
las-fir. Swollen open cankers, 2 to 3 inches long,
are formed on suppressed saplings.
Lachnellula resinaria (formerly
Dasyscyphus
resinaria
).
Canker
on balsam fir. Swollen cankers
at base of branches; younger stems girdled and
killed.
Lachnellula subtilissima (formerly
Dasyscyphus calycina
(
Trichoscyphella
hahniana
)). On larch and fir, ordinarily
a saprophyte but can be a weak parasite; occa-
sional on blister-rust cankers.
Lachnellula willkommii (formerly
Dasyscyphus willkommii
(
Trichoscyphella
willkommii
syn.
Lachnellula wilkommii
)).
Euro-
pean Larch Canker
. Found in Massachusetts in
1927 on nursery stock from Great
Britain. Infected trees were removed and the
fungus not seen again until 1935, near the
original location. Perennial branch or trunk
cankers are flattened depressions, swollen on
the flanks and on the opposite side of the
stem. Neighboring bark is somewhat cracked
and dark with heavy exudation of resin. Cup-
shaped apothecia are 3 to 6 mm across with
white hairs and orange to buff discs, very short
stalks. Young trees may be killed; older trees
usually survive. Frost wounds are a contributing
but not an essential factor. Promptly remove all
trees
▶
Valsa cincta
for further discussion of can-
kers on stone fruits.
Dasyscyphus
Ascomycetes, Helotiales, Helotiaceae
Apothecia stalked, white and hairy on the outside
with a bright disc; paraphyses filiform; asci
inoperculate; spores elliptical to fusoid.
Dasyscyphus
Lachnellula
agassizii
). Common on blister-rust lesions of
white pine; saprophytic on dead branches.
Dasyscyphus
agassizi (see
▶
calycina (
Trichoscyphella
hahniana
) (see
▶
Lachnellula subtilissima
). On
larch and fir, ordinarily a saprophyte but can be
a weak parasite; occasional on blister-rust
cankers.
Dasyscyphus ellisiana
Canker
of Douglas-fir
and pine in eastern United States. This is
a native fungus on twigs and branches of native
and introduced pines and on basal trunk
and branches of Douglas-fir. Bark on trunk
may be infected for 10 to 15 feet, with
copious resin flow and numerous swellings, but
trees are not killed. Apothecia are short-stalked,
covered with white hairs, with an orange to yel-
low disc, 2 to 4 mm across. Remove trees with
trunk cankers.
showing
cankers;
continue
periodic
inspection.
