Biology Reference
In-Depth Information
Pseudomonas melophthora
Apple Rot
, proba-
bly widespread. This is a decay of ripe apples
following after apple maggots and eventually
rotting whole fruit.
Pseudomonas pseudoalcaligenes (see
Acetovorax avenae
subsp.
citrulli
).
Angular
Leaf Spot
of muskmelon and watermelon.
Fruit
Blotch
on melon,
squash,
pumpkin,
and
watermelon.
Pseudomonas ribicola On golden currant
in
Wyoming.
Pseudomonas sesami
Bacterial Leaf Spot
of
sesame. Brown spots on leaves and stems. Can
be controlled by treating seed with streptomycin.
Pseudomonas solanacearum (see
Rolstonia
solanacearum
).
Southern Bacterial Wilt
, also
called
Brown Rot
,
Bacterial Ring Disease
,
Slime
Disease, Granville Wilt
(of tobacco), present in
many states but particularly prevalent in the
South, from Maryland around the coast to Texas.
Pseudomonas syringae
Canker
on kiwifruit;
also
Blight
on impatiens and mock orange. Also
Leaf Spot
on English and American elm, moun-
tain-laurel, arugula and coriander.
Stem Dieback
of Centaurea and fennel.
Pseudomonas syringae pv. aceris (formerly
Pseudomonas aceris
).
Maple Leaf Spot
found in
California on big leaf maple. Small, water-soaked
spots, surrounded by yellow zones, turn brown or
black; cankers develop on petioles and bracts in
serious cases; leaves may drop; disease present in
cool, damp weather of early spring.
Pseudomonas syringae pv. angulata (formerly
Pseudomonas angulata
).
Blackfire
of tobacco.
Pseudomonas syringae pv. apii
Bacterial
Blight
of celery. Small, irregularly circular rusty
leaf spots, with a yellow halo, are occasionally
numerous enough to cause death of foliage, but
commonly are only disfiguring. Spray plants in
seedbed with bordeaux mixture, or dust with cop-
per lime dust; clean up old refuse.
Pseudomonas syringae pv. apii
Bacterial Leaf
Spot
of celery.
Pseudomonas syringae pv. aptata
Bacterial
Spot
on beets, Swiss chard, and nasturtium.
Spots on nasturtium leaves are water-soaked,
brownish, 1/8 to 1/4 inch across. On beets they
Fig. 3
Bacterial Black Spot on Chrysanthemum
develop in the next season; if they are girdled, the
entire twig is blighted. Cut out infected twigs and
spray with bordeaux mixture or an antibiotic.
Pseudomonas caryophylli (see
Burkholderia
caryophylli
).
Bacterial Wilt
of carnation, usually
under glass.
Pseudomonas cattleyae (see
Acidovorax
cattleyae
).
Brown Spot
of orchids,
Phalaenopsis
and
Cattleya
, common in greenhouses.
Pseudomonas cepacia (see
Burkholderia
cepacia
).
Sour Skin Rot
of onion. Slimy yellow
rot of outer fleshy scales, with a vinegar odor.
Pseudomonas cichorii
Bacterial Leaf Spot
on
basil.
Bacterial Blight
on Lobelia.
Pseudomonas cichorii
Bacterial Rot
of chicory,
Belgium endive, French endive, iris,
Soft Rot
of
potato, and
Bacterial Leaf Spot
of hibiscus, gera-
nium, magnolia and rhododendron. May also
cause a
Leaf Spot
and
Stem Necrosis
on chrysan-
themum (see
Fig. 3
) and
Bacterial Leaf Blight
on
dwarf
Schefflera
. A yellowish olive center rot,
affecting young inner leaves.
Pseudomonas corrugata
Stem Rot
of tomato,
also
Pith Necrosis
.
Pseudomonas fluorescens (
marginalis
).
Mar-
ginal Blight
of lettuce,
Kansas Lettuce Disease
,
also on witloof chicory,
Soft Rot
of potato tubers.
Leaf margins are dark brown to almost black, first
soft, then like parchment. Yellowish red spots,
turning dark, are scattered over leaves. Infected
tissue disintegrates into an odorous mass. Bacte-
ria live in the soil, which should not be splashed
on plants by careless watering.
Pseudomonas gladioli (see
Burkholderia glad-
ioli
).
Leaf Spot
and
Blight
on bird's nest fern.
