Biology Reference
In-Depth Information
may run together to give a blotched appearance.
Minute black fruiting bodies pepper the spots,
which are often associated with injury by the
catalpa midge. Heavy infection may mean
defoliation.
Phyllosticta circumscissa
Leaf Spot
, wide-
spread on apricot, peach, sour cherry, choke-
cherry, and garden plum.
Phyllosticta concentrica
English Ivy Leaf Spot
,
also a twig blight, widespread. Plants look rag-
ged. Fruiting bodies are arranged in spots in con-
centric circles.
Phyllosticta cookei
Magnolia Leaf Spot
. Spots
are grayish without definite margins.
Phyllosticta decidua
Phoma exigua
).
Leaf Spot
of agrimony, aralia, basil weed,
betony, cynoglossum, eupatorium, germander,
hierachia, hoarhound, motherwort,
(see
▶
lycopus,
mint, and monarda.
Phyllosticta ilicis (Teleomorph, Physalospora
ilicis) (see
Fig. 4
Phyllosticta Leaf Spot on Mountain-Laurel
Discochora philoprina
).
Holly
Leaf Spot
on American and English holly and
on winterberry.
Phyllosticta hamamelidis
Witch-Hazel Leaf
Spot
. Small spots enlarge to reddish brown
blotches, causing some defoliation.
Phyllosticta hydrangeae
Hydrangea Leaf
Spot
, widespread. Brown spots usually near leaf
margins; in severe cases both leaves and blos-
soms are killed. Spray with bordeaux mixture.
Phyllosticta kalmicola (Teleomorph,
Mycosphaerella colorata
).
Mountain-Laurel
Leaf Spot
,
Kalmia Leaf Spot
. Circular, grayish
white to silvery spots with red or purple borders,
up to 1/4 inch across, are sparsely or thickly
covered with black pycnidia (see
Fig. 4
). Heavy
infection means disfigured foliage and some
defoliation. The disease is worse in shady loca-
tions where shrubs are under drip of trees.
Phyllosticta maculicola
Dracaena Leaf Spot
.
Irregular small brown spots have yellowish mar-
gins and long coils of spores from black pycnidia.
Phyllosticta maxima
Rhododendron Leaf
Spot
, widespread. Spots are marginal or terminal,
large, dark brown, and zonate.
Phyllosticta minima
Maple Leaf Spot
,
Gray
Spot
, also on boxelder, widespread. Spots are
▶
irregular, 1/4 inch or more across, with brownish
centers, containing black pycnidia, and purple-
brown margins. The disease is seldom serious
enough for control measures.
Phyllosticta penicillariae Leaf spot; also stunt
chlorosis; on Pennisetum.
Phyllosticta richardiae
Calla Leaf Spot
. Small,
round, ash-gray spots run together, producing
irregular decayed areas.
Phyllosticta saccardoi (see
Asterostomella
saccardoi
).
Rhododendron Leaf Spot
, similar
to that caused by
P. maxima
.
Phyllosticta sanguinariae
Bloodroot Leaf
Spot
. Spots reddish brown with a darker border,
then a zone of Indian red.
Phyllosticta sojicola
Leaf Spot
and
Pod Spot
of
soybean; lesions have purplish red borders sur-
rounding lighter brownish centers which contain
numerous dark pycnidia (
Fig. 4
).
Phyllosticta vaccinii
Leaf Spot
of farkleberry
and highbush blueberry. Also Blueberry; Fruit
Rot. Early rot, scald, blast; on cranberry. Small,
circular gray spots, with one to six pycnidia in
center, have brown margins. The disease is
▶
