Biology Reference
In-Depth Information
There may be premature defoliation and kill-
ing of twigs.
Marssonina rhabdospora (Teleomorph,
Pleuroceras populi
)
Macrophoma
Cankers and Diebacks
.
Macrophoma candollei
Leaf Spot
of boxwood.
Conspicuous black pycnidia on dead leaves, usu-
ally straw-colored, sometimes brown or tan. The
fungus is a weak parasite coming in secondarily
after winter injury or other predisposing factors.
Cylindrosporium
populinum
). Leaf Spot of poplar.
Marssonina rosae Anamorph state of the rose
blackspot fungus,
Diplocarpon rosae
.
Marssonina tremulae
Leaf Spot
on poplar.
Marssonina truncatula (see
(see
▶
▶
Didymosporina
aceris
).
Leaf Spot
and
Leaf Blight
of Norway
maple.
Piggotia fraxini (formerly
Marssonina fraxini
).
Ash Leaf Spot
, sometimes serious in nursery stock,
controlled by spraying with bordeaux mixture.
▶
Marssonina
Anthracnose
.
Cylindrosporium populinum (formerly
Marssonina rhabdospora
; Teleomorph,
Pleuroceras populi
).
Leaf Spot
of poplar.
Brown spots on living leaves; beaked pyriform
perithecia formed in fallen leaves over winter.
Didymosporina aceris (formerly
Marssonina
truncatula
).
Leaf Spot
and
Leaf Blight
of Norway
maple.
Diplosporonema delastrei (formerly
Marssonina delastrei
).
Leaf Spot
on corncockle
and campion.
Discella ochroleuca (formerly
Marssonina
ochroleuca
).
Leaf Spot
on oak, American chest-
nut. Spots are circular, yellow to brown with
concentric markings, small on chestnut, up to an
inch on oak.
Marssonina daphnes
Daphne Leaf Spot
.
Small, thick brown spots on both sides of leaf,
which turns yellow, dies.
Marssonina delastrei (see
▶
Mastigosporium
Deuteromycetes, Hyphomycetes
Conidiophores hyaline, very short, simple;
conidia with four or more cells, with or without
apical appendages: broadly cylindrical with
rounded or pointed ends; parasitic on grasses.
Mastigosporium rubricosum
Leaf Fleck
on
redtop and bent grasses. Spores with rounded
ends, without appendages.
Melanconium
Deuteromycetes, Coelomycetes
Diplosporonema
Acervuli subcutaneous or subcortical, conic or
discoid, black; with setae; conidiophores simple;
conidia dark, one-celled, ovoid to ellipsoid; par-
asitic or saprophytic.
Melanconium pandani
Leaf Spot
on pandanus.
▶
delastrei
).
Leaf Spot
on corn-cockle
and
campion.
Marssonina fraxini (see
Piggotia fraxini
).
Ash Leaf Spot
, sometimes serious in nursery
stock, controlled by spraying with bordeaux
mixture.
Marssonina
▶
Melasmia
juglandis See
Gnomonia
▶
leptostyla
under Anthracnose.
Marssonina
Deuteromycetes, Coelomycetes
Discella
ochroleuca
).
Leaf Spot
on oak, American
chestnut.
Marssonina populi
Poplar Leaf Spot
. Brown
spots with darker margins.
ochroleuca (see
▶
Pycnidia in a broad, black, flattened stroma that is
superficial or nearly so, dimidiate; conidiophores
simple or branched; spores hyaline or subhyaline,
