Biology Reference
In-Depth Information
Dogwood Mosaic Nepovirus
Fig Mosaic
Considered earlier as a strain of Arabis Mosaic
Nepovirus.
Systemic chlorotic mottling is accompanied by
severe leaf distortion; fruits have light circular
areas or rusty spots, may be deformed and drop
prematurely. Transmission is by grafting and the
fig midge (
Aceria ficus
).
Elderberry Disease ¼ Elderberry
Carlavirus, Elderberry Latent
Carmovirus
Figwort Mosaic Caulimovirus
A virus disease reported from golden elderberry
can infect various stone fruits and is considered
a potential threat to the fruit industry.
The viral DNA has little homology with that of
Cauliflower Mosaic Caulimovirus.
Elm Mosaic
Filaree Red Leaf Luteovirus
On American elm in Ohio and eastern states.
Some leaves are larger than normal, others
small, distorted, with yellow and green mottling.
There may be some branch brooming, gradual
decline in vigor. Transmission is by grafting; no
insect vector is known.
On
Erodium
in California. Early symptoms are
mild vein clearing, outward curvature of petioles,
inward cupping of leaflets. Later leaflets cup out-
ward, with reddish discoloration, are brittle, with
petioles stiffly upright; flowers are dwarfed or
suppressed. Aphids are vectors. Caused vein
clearing and chlorosis of young leaves; older
leaves are red and breakable. Infected plants are
stunted and do not develop flowers.
Elm Zonate Canker
On American elm, New Jersey, Ohio, Missouri.
Zonate cankers appear in bark as rings of dead
and living tissue in cortex or phloem. Some
leaves develop brown necrotic spots. Transmis-
sion is by bark patch grafts; no insect vector is
known.
Foxtail Mosaic Potexvirus
Virus related to Narcissus Mosaic and Viola
Mottle Potexvirus.
Geranium Chlorotic Spot
Euonymus Mosaic
General on geranium. It is caused by tomato and
tobacco ring spot nepoviruses.
Infectious Variegation. Persistent yellowing along
veins; transmission by grafting and budding.
Geranium Crinkle
Euphorbia Mosaic Begiminivirus
Pelargonium Leaf Curl Tombusvirus. General on
geranium. Hyaline spots are small, circular to
irregular, sometimes star-or tree-shaped, with
brown centers. Young leaves are crinkled,
small, sometimes puckered and split; severely
Spreads in Florida by nymphs and adults of
Bemisia tabaci
. Infected plants showed mosaic
and leaf malformation.
