Biology Reference
In-Depth Information
Sarcotrochilia balsameae (formerly
Phacidium balsameae
).
Needle Blight
of balsam
fir in New England, of white and alpine fir in the
Northwest.
Phoma piceina
Twig and Needle Blight
of Nor-
way spruce. May cause defoliation and some-
times death of forest trees.
Phoma sclerotioides
Brown Root Rot
of alfalfa.
Phoma
Sclerophoma
pythiophila
), on cone scales of Norway spruce.
Sclerophoma pythiophila (formerly
Phoma strobiligena
), on cone scales of Norway
spruce.
strobiligena (see
▶
Phaeoacremonium
Phaeoacremonium chlamydosporum
Black
Goo
on grape.
Phomopsis
Phialophora
Deuteromycetes, Coelomycetes
Rots
.
Phialophora graminicola
Blight
on turfgrasses
(associated with Fusarium blight syndrome).
▶
Pycnidia dark, ostiolate, immersed, erumpent,
nearly globose; conidiophores simple; conidia
hyaline, one-celled, of two types-ovate or ellip-
soidal and long, filamentous, sickle-shaped or
hooked at upper end (
Fig. 1
). Anamorph state of
Diaporthe
; parasitic causing spots on various
plant parts.
Dendrophoma obscurans (see
Phloeospora
Deuteromycetes, Coelomycetes
Pycnidia dark, imperfectly formed, globose,
innate in tissue, not in distinct spots; conidia
hyaline or subhyaline, several-celled, elongate
fusoid to filiform; parasitic or saprophytic. One
of the conidial forms linked with
Mycosphaerella
as a teleomorph state.
Phloeospora adusta
Leaf Blight
of clematis.
Phomopsis
obscurans
). Strawberry Leaf Blight, Angular
Leaf Spot.
Phomopsis ambigua (teleomorph,
Diaporthe
eres
).
Twig Blight
of pear, widespread.
Phomopsis diospyri
Twig Blight
of native
persimmon.
Phomopsis japonica
Twig Blight
of kerria.
Phomopsis juniperovora
Nursery Blight
,
Juni-
per Blight
,
Cedar Blight
,
Canker
on red-cedar
and other junipers, cypress, chamaecyparis, Jap-
anese yew (
Cephalotaxus
), arborvitae, giant
sequoia, and redwood. This disease occurs in
virulent form from New England to Florida and
through the MiddleWest; it may also occur on the
Pacific Coast.
Tips of branches turn brown with progressive
dying back until a whole branch or even a young
tree is killed. Trees over 5 years old are
less seriously injured. Spores produced in quan-
tity in pycnidia on diseased twigs ooze out in little
tendrils in moist weather, to be spread by
splashing water, insects, and workers. Entrance
is through unbroken tissue as well as wounds; the
stem is killed above and below the point of
▶
Phoma
Blackleg
.
Phoma conidiogena (see
▶
Phoma glomerata
).
Boxwood Tip Blight
. Ashy gray necrotic areas at
leaf tips, with pycnidia on both leaf surfaces.
Phoma
▶
glomerata
(formerly
Phoma
conidiogena
).
Boxwood Tip Blight
.
Ashy gray necrotic areas at leaf tips, with
pycnidia on both leaf surfaces.
Phoma fumosa
Twig Blight
, occasional on
maple.
Phoma macdonaldii
Blight
,
Premature Ripen-
ing
of sunflower.
Phoma mariae
Twig Blight
on
Japanese
honeysuckle.
