Biology Reference
In-Depth Information
Coryneum berckmansii (see
Seimatosporium
berckmansii
).
Coryneum Blight
of Oriental arbor-
vitae, also on Italian cypress, causing serious
losses in nurseries and home gardens in the Pacific
Northwest.
Coryneum microstictum (see
formed on foliage, dropping out to leave typical
shot holes, followed by considerable defoliation.
Apricot buds are blackened and killed during
winter; fruiting wood in peaches is killed before
growth starts. In late rains leaves and fruit are
peppered with small, round, dead spots. Fruit
lesions are raised, roughened, scabby. The fungus
winters in twigs, diseased buds and spurs.
Control
In California, the standard spray for
peach is bordeaux mixture applied in autumn
immediately after leaf fall and before the rainy
season. On apricots additional sprays are suggested
for late January and at early bloom. On almonds at
least two spring sprays are recommended, one at
the popcorn stage of bloom, the other at petal fall.
▶
Seimatosporium
lichenicola
).
Twig Blight
of American bladdernut.
Coryneum carpophilum (Cladosporium
beijerinckii) (see
▶
Stigmina carpophila
,
Anamorph,
Cladosporium beijerinckii
).
Peach
Shoot Blight
,
Coryneum Blight
of stone fruits,
Shot Hole
,
Fruit Spot
,
Winter Blight
,
Pustular
Spot
, general on peach in the West, also on
almond, apricot, nectarine, and cherry.
Seimatosporium berckmansii (formerly
Coryneum berckmansii
).
Coryneum Blight
of
Oriental arborvitae, also on Italian cypress, caus-
ing serious losses in nurseries and home gardens
in the Pacific Northwest. Small twigs or branches
are blighted, turn gray-green then reddish brown;
many small branchlets drop, leaving a tangle of
dead gray stems; larger limbs may be girdled.
Twigs are dotted with black pustules bearing
five-septate spores. As new growth develops
in blighted areas, the spores spread the disease
to young contiguous foliage. Reinfection
continues until the plant is so devitalized it dies.
The fungus fruits only on scale leaves or young
stems.
Control
Remove and destroy blighted twigs.
Apply a copper spray in September to healthy
bushes as a preventive spray; apply in September
and repeat in late October to infected bushes.
Seimatosporium lichenicola (formerly
Coryneum microstictum
).
Twig Blight
of Ameri-
can bladdernut. Young twigs are killed; the fun-
gus winters in acervuli on this dead tissue, and
spores are disseminated in spring. Prune out and
burn diseased twigs during the winter.
Stigmina carpophila (formerly
Coryneum
carpophilum
(
Cladosporium beijerinckii
)).
Peach Shoot Blight
,
Coryneum Blight
of stone
fruits,
Shot Hole
,
Fruit Spot
,
Winter Blight
,
Pus-
tular Spot
, general on peach in the West, also on
almond, apricot, nectarine, and cherry. Twig lesions
are formed on 1 -year shoots, reddish spots devel-
oping into sunken cankers; fruit buds are invaded,
and there is copious gum formation. Small spots are
▶
Cryptocline
Deuteromycetes, Coelomycetes
Cryptocline cinerescens
Twig Blight
of oaks.
Cryptospora
Scomycetes, Amphisphaeriales
Perithecia immersed in a stroma, with long necks
converging into a disc; ascospores long, filiform,
hyaline; conidia on a stroma.
Cryptospora longispora (see
Servazziella
longispora
). Araucaria Branch Blight.
Servazziella longispora (formerly
Cryptospora
longispora
). Araucaria Branch Blight. Lower
branches are attacked first, with disease spread-
ing upward; tip ends are bent and then broken off;
plants several years old may be killed. Prune off
and burn infected branches.
▶
Cryptostictis
Deutermycetes, Coelomycetes
Spores dark, with several cross walls, formed in
acervuli.
Cryptostictis sp.
Twig Blight
of dogwood.
