Biology Reference
In-Depth Information
Fruit Spots
Helminthosporium
Many fruit blemishes are symptoms of rot dis-
eases and are treated under Rots; others are due to
physiological disturbances; a few others, limited
to fruits and known primarily as fruit spots or
specks, are included here.
Blights .
Helminthosporium papulosum Black Pox on
apples and pears in eastern states. Fruit spots are
small, sunken, dark, scattered in profusion over
the surface. Blackish papules on bark are
followed by a pitted or scaly condition. Spray
with sulfur (except at high temperatures).
Aureobasidium
Deuteromycetes
Microthyriella
Yeast-like growth characteristics.
Aureobasidium pullulans Fruit Russet on
apple.
Ascomycetes, Hemisphaeriales
Vegetative mycelium lacking; stromata with
radial structure appearing as black superficial
dots on leaves or stems.
Microthyriella
Cribropeltis
Deuteromycetes, Coelomycetes
Schizothyrium
pevexiguum ). Fly Speck of pome fruits, general
on apple, also on pear, quince, citrus fruits,
banana, Japanese persimmon, plum, blackberry,
raspberry, and grape.
Schizothyrium pevexiguum (formerly
Microthyriella rubi ). Fly Speck of pome fruits,
general on apple, also on pear, quince, citrus
fruits, banana, Japanese persimmon, plum, black-
berry, raspberry, and grape. The pathogen has
long been recorded as Leptothyrium pomi , but
this is apparently a misconception. The anamorph
state is Zygophiala jamaicensis , originally iso-
lated from banana and recently reported as caus-
ing a greasy blotch of carnations. Flyspeck is
rubi
(see
Brown mycellium, branches profusely; black,
irregularly circular pycnidia; simple, hyaline,
clavate conidiophores; pale, oblong, straight or
slightly curved conidia.
Cribropeltis citrullina Fly Speck of water-
melon fruits.
Zygophiala
Blotch Diseases .
Zygophiala jamaicensis
( Schizothyrium pomi ).
Fly Speck on apple.
 
 
 
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