Biology Reference
In-Depth Information
Phloeospora aceris Leaf Spot of maple, includ-
ing vine and dwarf maples. The spot is small,
rather angular, common but not important.
Asterostomella saccardoi (formerly
Phyllosticta saccardoi ). Rhododendron Leaf
Spot , similar to that caused by P. maxima .
Discochora philoprina (formerly Phyllosticta
ilicis (Teleomorph, Physalospora ilicis )). Holly
Leaf Spot on American and English holly and on
winterberry.
Phoma exigua (formerly Phyllosticta
althaeina ). Leaf Spot , Stem Canker on abutilon
and hollyhock. Ashy spots have black dots of
pycnidia. The tissue sometimes becomes brittle
and falls away, leaving jagged holes.
Phoma exigua (formerly Phyllosticta decidua ).
Leaf Spot of agrimony, aralia, basil weed,
betony, cynoglossum, eupatorium, germander,
hierachia, hoarhound, motherwort,
Phoma
Blackleg .
Phoma sp. Leaf Spot on ragweed.
Phomopsis
Blights .
Phomopsis viticola Leaf Spot on grape.
lycopus,
Phlyctema
mint, and monarda.
Phyllosticta althaeina (see
Phoma exigua ).
Leaf Spot , Stem Canker on abutilon and
hollyhock.
Phyllosticta andropogonivora Leaf Spot on
bluestem (Andropogon).
Phyllosticta antirrhini Snapdragon Leaf Spot ,
Stem Rot , Blight . Large circular, dark brown or
black spots, with concentric ridges, are located
most often near tips and margins of leaves; cen-
ters may be cream to pale brown, dotted with dark
pycnidia. Young leaves may be curled, older
leaves shrivel and hang down along the stem.
Petioles are girdled with brown elongated
lesions. Stems have firm brown rot with shoots
or branches wilting or have ashy white spots with
dark brown or purplish margins and stems crack-
ing in area of spots. Young seedlings may damp
off. Spray with bordeaux mixture; keep green-
house cool; avoid wetting foliage in watering;
clean up diseased plants.
Phyllosticta aucubae Aucuba Leaf Spot .
Brown or black zonate spots are mostly along
margins of leaves, sometimes with much defoli-
ation. Spores are exuded from leaves in yellow
tendrils, then spread by rain, or syringing in the
greenhouse.
Phyllosticta camelliae (syn. P. camelliaecola)
Camellia Leaf Spot . Lesions are irregular brown
spots.
Phyllosticta catalpae Catalpa Leaf Spot . Dark
brown or black spots 1/8 to 1/4 inch in diameter,
Deuteromycetes, Coelomycetes
Pycnidia dark, separate or sometimes confluent,
in or under epidermis or bark; closed or ostiolate;
conidiophores simple or forked; conidia hyaline,
one-celled, cylindrical or long spindle-shaped,
mostly bent, sickle-shaped; saprophytic usually.
Phlyctema ficuum Leaf Spot on strangler fig.
Phyllachora
Ascomycetes, Phyllachorales
Asci in locules, immersed in groups in a dark
stroma covered by host tissue at maturity; spores
one-celled, hyaline; paraphyses present; asci
cylindrical with short pedicels.
Phyllachora graminis Tar Spot , Black Leaf
Spot , general on wheatgrass, ryegrass, fescues,
redtop, and bent grass. Elongated grayish violet
to dark olive green spots, on both leaf surfaces,
turn glossy black. The disease is seldom serious.
Phyllachora sylvatica Tar Spot on fescues in
Northwest.
Phyllosticta
Blights .
 
 
 
Search WWH ::




Custom Search