Biology Reference
In-Depth Information
Fusarium
Rots .
Fusariumdecemcellulare (Teleomorph, Nectria
rigidiuscula ). Gall on midge.
Kutilakesa
Deuteromycetes, Hyphomycetes
Sporodochia erumpent, pale olive-green, cush-
ion-shaped; similar to Kutilakesopsis but differs
by having larger two-celled conidia; teleomorph
state is Nectriella .
Kutilakesa pironii Stem and Leaf Gall , Can-
kers on croton, zebra plant, and Clorodendron .
Nocardia
Fig. 1 Azalea Leaf Gall
Actinomycetales
sometimes a flower bud (see Fig. 1 ). They are
white or pink, soft and succulent when young,
brown and hard with age. This is seldom a serious
disease but in wet seasons, particularly in the
South, and in shaded gardens, the number of
galls may become rather alarming. On cran-
berries and blueberries the gall is a small, round,
red blister in the leaf, with spores packed in
a dense layer on the underside. The fungus is
systemic in blueberries, fruiting on the leaves in
June and July.
Control Handpick and destroy galls as they
appear. Spraying is seldom required for cran-
berries and other fruits.
Exobasidium vaccinii-uliginosi Shoot and
Leaf Gall , Witches' Broom of rhododendron,
manzanita, and mountain heath. An excessive
number of twigs is formed on infected branches.
Leaves are yellowish white covered with a dense
mealy fungus growth. The mycelium penetrates
the whole plant so that it is wiser to remove the
shrub than to attempt remedial measures.
Related to bacteria with mycelial filaments
breaking up into rod forms.
Nocardia vaccinii Blueberry Bud-Proliferating
Gall , first observed in Maryland in 1944,
described as a new species in 1952. Galls, similar
to crown gall, are formed at the soil line. Abnor-
mal buds abort at an early stage or grow into weak
shoots, 1 to 6 inches high, forming a witches'
broom effect.
Phoma, Phomopsis
Blights .
Phoma sp. or Phomopsis sp Stem Gall on win-
ter jasmine, privet, forsythia, and rose, at
scattered locations. Both pathogens have been
reported causing roundish, rather rough stem
enlargements on ornamentals. It has not been
determined whether more than one fungus is
involved.
 
 
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