Biology Reference
In-Depth Information
turn red or purple during summer. Transmission
by a leafhopper.
Cocksfoot Streak Potyvirus
Caused chlorotic streaks on leaves of
Dactylis
glomerata
.
Clover (Alsike) Mosaic
¼
Clover
Yellows Vein Potyvirus
Coleus Mosaic ¼ Cucumber Mosaic
Cucumovirus
On pea, causing chlorotic spotting and dark green
banding of veins, leaves slightly cupped or
distorted. Leaf puckering and plant stunting on
bean. Pea aphid is vector.
Reported from Illinois on coleus, symptoms vary-
ing with variety. Leaves may be puckered, crin-
kled, asymmetrical, with oak-leaf markings or
ring spots or small necrotic spots.
Clover (Red) Vein Mosaic Carlavirus
On garden pea, causing pea stunt, broad bean,
sweet pea, and red clover. Vein clearing and
chlorosis are chief symptoms with, on peas, curl-
ing of leaves and rosetting of younger shoots,
wilting, and collapse. Vein clearing is the only
symptom on sweet pea. Broad beans may be
stunted and killed. Transmission is by the pea
aphid without incubation period or long reten-
tion. The Wisconsin pea stunt virus may be
a strain of the red clover virus.
Commelina Diffusa Potyvirus and
Commelina Mosaic Potyvirus
Both viruses infected
Commelina diffusa
and
Rhoeo spatecea
on which mosaic or systemic
mottling symptoms occurred. Both viruses
induced pinwheel structures in the cytoplasm.
Coriander Feathery Red Vein
Nucleorhabdovirus
Clover Yellow Mosaic Potexvirus
Virus multiplies in vectors (
Myzus perscicae and
Hydaphis foeniculi
) and is transmitted congeni-
tally to the progeny of the vector.
Transmitted by mechanical inoculation; serolog-
ically related to White Clover Mosaic, Cactus
X and Hydrangea Ringspot Potexviruses.
Corn Leaf Fleck
Clover Yellow Vein Mosaic
On field and sweet corn in California. Small,
circular pale spots on leaves with tip and mar-
ginal burning, leaves dying 7 to 10 days after
initial symptoms. Transmission by corn, peach,
and apple grain aphid, which retain the virus for
their entire lives.
On winged bean, wild carrot, poison hemlock,
and red bean.
Clover Wound Tumor Phytoreovirus
Big vein disease, causing enlargement of veins,
sometimes with enations, woody tumors on roots,
sometimes stems. The virus was discovered acci-
dentally in leafhopper nymphs and has been trans-
mitted experimentally to many plants besides
clovers.
Corn (Sweet) Mosaic
Leaves have broken or continuous interveinal
chlorosis.
