Biology Reference
In-Depth Information
Dothichiza caroliniana
Leaf Spot
,
Double Spot
of blueberry, found only on
Vaccinium australis
in
North Carolina, but there causing extensive defo-
liation. Leaf spots are small, circular, with brown
centers and a dark brown ring, but in late summer
infection spreads to a secondary necrotic area
around the original spot, giving the common
name of double spot. Black pycnidia are formed
sparsely in the spots. All varieties of high bush
blueberries are somewhat susceptible, but Cabot,
Dixie, Pioneer, and Rancocas are most damaged.
Dilophospora
Deuteromycetes, Coelomycetes
Pycnidia distinct in a stroma; conidia very long,
filiform, with bristlelike hairs at each end. Usu-
ally found on cereals and sometimes with the
wheat nematode, causing a disease called twist.
Dilophospora
Pestalozziella
subsessilis
).
Leaf Spot
on native geranium.
Pestalozziella subsessilis (formerly
Dilophospora geranii
).
Leaf Spot
on native
geranium.
geranii (see
▶
Ectostroma
Deuteromycetes, Hyphomycetes
Diplodina
Black stromata formed in leaves and stems.
Ectostroma liriodendri
Tar Spot
, widespread
in tulip-trees but perhaps secondary after insect
injury.
Deuteromycetes, Coelomycetes
Pycnidia black, separate, immersed or erumpent,
globose or flattened, ostiolate; conidiophores sim-
ple, slender; conidia hyaline, two-celled, ovoid or
ellipsoid; parasitic or saprophytic. Similar
Epicoccum
to
Deuteromycetes, Hyphomycetes
Ascochyta
but not produced in spots.
Diplodia rhododendri
Encoeliopsis rho-
dodendron
).
Leaf Spot
on rhododendron.
Encoeliopsis
(see
▶
Sporodochia dark, rather cushion-shaped; conid-
iophores compact or loose, rather short; conidia
dark, with one or more cells, globose; mostly
saprophytic.
Epicoccum asterinum (see
rhododendron
(formerly
Diplodia
rhododendri
).
Leaf
Spot
on
rhododendron.
Epicoccum
nigrum
).
Leaf Spot
of yucca;
E. neglectum
,on
royal palm;
E. nigrum
,on
Magnolia grandiflora
;
E. purpurascens
, on amaryllis.
Epicoccum nigrum (formerly
Epicoccum
asterinum
).
Leaf Spot
of yucca;
E. neglectum
,
on royal palm;
E. nigrum
,on
Magnolia grandi-
flora
;
E. purpurascens
, on amaryllis. All of these
may be secondary infections.
E. neglectum
and
E. purpurascens
are also synonyms of
E. nigrum
.
▶
Diplotheca (Stevensea)
Ascomycetes, Myriangiales
Asci born singly in locules at various levels in
a massive stroma; spores dark, several-celled.
Diplotheca wrightii
Black Spot
,
Charcoal Spot
of Opuntia cacti in Florida and Texas uncommon
in the North. Dark spots, 1/4 inch or more in
diameter, are surrounded by a ring of fruiting
bodies.
Exosporium
Deuteromycetes, Hyphomycetes
Dothichiza
Conidia on subglobose to convex sporodochia;
spores dark, with two to several cells, somewhat
club-shaped.
Cankers and Diebacks
.
▶
