Biology Reference
In-Depth Information
Gloeosporium
Griphosphaeria
Ascomycetes, Amphisphaeriales
Anthracnose
.
Gloeosporium sp.
Canker
on holly.
Gloeosporium sp. (
Gnomonia rubi
,
Teleomorph).
Canker
on thornless blackberry.
▶
Perithecial wall carbonaceous, mouths papillate;
spores dark, with several cells.
Discostroma corticola (formerly
Griphosphaeria corticola
(Anamorph,
Seimatosporium lichenicola
).
Rose Canker
,
Die-
back
. Cankers are formed near base of canes,
often showing dark glistening pustules of conidia.
Occasionally when the canker has girdled the
cane, a large gall forms above the lesion (see
Fig. 3
). It resembles crown gall but is apparently
due to interference with downward transfer of
food. Cut out infected canes.
Griphosphaeria corticola (see
Glomerella
Anthracnose
.
Glomerella cingulata
Camellia Dieback
,
Can-
ker
, widespread; sometimes on azalea, black-
berry, bittersweet, rose, raspberry, soapberry,
mountain-ash, and English ivy; also causing bitter
rot of apple (
▶
Discostroma
corticola
(Anamorph,
Seimatosporium
lichenicola
)).
Rose Canker
,
Dieback
. Cankers
are formed near base of canes, often showing
dark glistening pustules of conidia.
▶
▶
hosts (
Anthracnose
)
. Camellia tips die back;
leaves wilt, turn dull green and finally brown.
The stem dries out, turns brown, and there is
a girdle of dead bark. Elliptical cankers are pre-
sent on older wood. Infection is solely through
wounds, principally leaf scars in early spring but
also through bark wounded by cultivating tools or
lawn mowers, frost cracks, or the graft union.
Governor Moulton, Professor Sargent, and
some other varieties are rather resistant; Flora
Plena, Prince Eugene Napoleon, and many others
are highly susceptible. Spraying with bordeaux
mixture to prevent infection through leaf and bud
scars gives fair control.
▶
Cryptosporiopsis (Glutinium)
Deuteromycetes, Coelomycetes
Pycnidia innate, without a stroma; spores borne at
tip and sides of conidiophores, hyaline, one-
celled.
Cryptosporiopsis pruinosa (formerly
Glutinium macrosporum
).
Canker
,
Fruit Rot
of
apple.
Glutinium
macrosporum (see
Cryptosporiopsis pruinosa
).
Canker
,
Fruit Rot
of apple.
▶
Fig. 3 Discostroma Canker on Rose
