Biology Reference
In-Depth Information
rusty brown with many layers of tubes, the oldest
stuffed with white. Infection is through branch
stubs and open wounds. A single conk may indi-
cate 15 linear feet of rot in heartwood.
Phellinus pini (formerly
Fomes pini
(
Trametes
pini
)).
Red Ring Rot
, white pocket rot, of coni-
fers, especially Douglas-fir, larch, pine and
spruce, causing heavy forest losses. Decay starts
as a purplish or red discoloration of the heart-
wood, but in an advanced stage there are many
soft, white fibrous pockets separated by sound
wood. Sporophores vary from shelf-to bracket-
to hoof-shaped, averaging 4 to 8 inches across,
rough gray to brownish black with light brown
margin on upper surface and gray to brown
underneath. Tube mouths are circular to irregular.
On living trees conks are formed at knots or
branch stubs.
Phellinus robiniae (formerly
Fomes rimosus
)
Heart Rot
on locust.
Phellinus robustus (formerly
Fomes robustus
).
Heart Rot
of cacti and other desert plants; of oak,
fir, juniper, in different strains. Context of sporo-
phores bright yellow-brown; spores hyaline.
smaller microconidia with one or two cells; rest-
ing spores, chlamydospores, common.
Teleomorph state when known usually in
Hypocreales,
Nectria
or
Gibberella
. Cause of
many important rots, wilts, and yellows diseases.
Classification difficult, with different systems
and synonyms, many forms and races. (see
Fig. 3
)
Fusarium acuminatum
Fruit Rot
of squash and
pumpkin.
Fusarium avenaceum
Crown Rot
of Eustoma.
Associated with cereal diseases, fruit and storage
rots, but now included in
F. roseum
by many
pathologists.
Fruit Rot
of squash and pumpkins.
Fusarium culmorum Also on cereals, included
in
F. roseum
by many pathologists.
Fruit Rot
of
squash and pumpkins, also
Root and Basal Rot
of
leak.
Fusarium equiseti
Fruit Rot
of squash and
pumpkin.
Fusarium moniliforme (Teleomorph,
Gibberella fujikuroi
).
Ripe Rot
of figs, carried
by the pollinating fig wasp;
Root, Stalk, Pink
Kernel Rot
of corn. The rotted kernels are pink
to reddish brown; the stalks have brown lesions,
may break over or ripen prematurely.
Fusarium oxysporum Reported as causing
a new disease of soybean in Missouri and Iowa.
Root rot, with rapid wilting and drying of leaves;
most severe on seedlings.
Fusarium oxysporum
Root Rot
on apple and
sage; tomato hypocotyl rot on sugar pine, red and
white firs; stem rot on zygocactus; and rot of
stone plant. This pathogen may also be seedborne
Fusarium
Deuteromycetes, Coelomycetes
Mycelium and spores generally bright in color.
Macroconidia fusoid-curved, septate, on
branched conidia in slimy masses, sporodochia;
Fig. 3
Forms of
Fusarium
.(a) septate macroconidia; (b) micoconidia in chains or a head; (c) clamydospores;
(d) sclerotium
