Biology Reference
In-Depth Information
Myrothecium sp. On Bells of Ireland, causing
crown necrosis. Stems are girdled at ground
level; tops wilt; basal branches die.
Monosporascus
Ascomycetes, Sordariales
Nematospora
Monosporascus cannonballus
Root Rot
on
cantaloupe and watermelon.
Ascomycetes, Saccharomycetales
Mucor
This is a yeast or budding fungus, following
after insect injury; asci, with 8 to 16 spores,
derived directly from vegetative mycelial cells;
spores elongate,
Zygomycetes, Mucorales
fusiform to needle-shaped,
Mycelium profusely developed. Sporangio-
phores erect, simple or branched, all branches
terminated by sporangia which are globose to
pyriform with a columella and thin wall; gam-
etangia essentially alike, suspensors without def-
inite
flagellate.
Nematospora coryli
Yeast Spot
of soybean,
Dry Rot
of pomegranate, citrus,
Pod Spot
of
pepper, bean and soybean,
Cloudy Spot
of
tomato,
Kernel Spot
of pecan. The yeast is almost
always associated with plant bug injury. The
western leaf-footed plant bug carries the fungus
from pomegranate to citrus. On pomegranates
depressed light spots in flesh around seeds are
followed by general browning and collapse. In
citrus, the juice sacs just inside the rind dry out
with a brownish to reddish stain. Cloudy spot on
tomato fruit is associated with pumpkin bugs and
leaf-footed plant bugs. Brown areas are formed
on pecan kernels.
Nematospora phaseoli
Yeast Spot
of lima
bean, a seed disease, destructive from Maryland
southward. Infection follows puncture of pods by
the southern green stinkbug and possibly other
insects. The seed lesions are dark brown, sunken,
wrinkled.
outgrowths;
hyaline
chlamydospores
sometimes formed.
Mucor mucedo
Postharvest Rot
of tomato.
Mucor piriformis
Postharvest Rot
of tomato.
Fruit Rot
of cherry.
Mucor racemosus
Storage Rot
of sweet potato,
occasional after chilling;
Fruit Rot of citrus. Control with low
temperatures and dry atmosphere in the storage
house.
Mycoleptodiscus
Mycoleptodiscus terrestris
Root and Stem Rot
of soybean and birdsfoot trefoil.
Myrothecium
Neurospora
Ascomycetes, Sordariales
Leaf Spots
.
Myrothecium roridum
Ring Rot
of tomato,
Crown Rot
of snapdragon and pansy. Crowns of
greenhouse snapdragons appear water-soaked,
then covered with a thin white mycelium and
numerous black sporodochia. Irregular brown
spots on tomato fruits are surrounded by slight
depressions. Also causes root rot of red clover
and alfalfa.
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Perithecia flask-shaped, membranous; asco-
spores dark, one-celled with gelatinous coating;
conidial stage monilioid
Neurospora sitophila
Ripe Rot
of pear. The
fungus is the same one causing pink bakery
mold on bread. There is a luxuriant pink growth
over fruit; conidia are formed in chains.
