Biology Reference
In-Depth Information
leaves on Japanese lilac. In common lilac and
Regal privet there is yellow vein clearing with
less prominent brooming. Transmission by
grafting, and by dodder; no insect vector known.
Lily Rosette
Yellow Flat. On Easter lily. Leaves curl down-
ward; plants are dwarfed, yellowed, mature early;
bulbs are small. Transmission by the melon
aphid, not by seed. Rogue diseased plants; spray
for aphids.
Lily Color Adding
On lily.
Lily Symptomless Carlavirus
Lily Color Removing
Present in Easter lilies wherever grown commer-
cially but producing no symptoms alone; in com-
bination with Cucumber Mosaic Cucumovirus
causing necrotic fleck. Transmission by melon
aphid.
On lily.
Lily Fleck
Caused by Lily Symptomless Carlavirus and
Cucumber Mosaic Cucumovirus. Yellow
flecks on Easter lily leaves change to gray or
brown, elongating parallel to veins; surface is
depressed but unbroken. Plants are dwarfed
with curled leaves, flowers small with brown
streaks.
Locust Witches' Broom
Brooming disease on locust from Pennsylvania to
Georgia, Ohio, and Tennessee. Vein clearing is
followed by reduction in size of new leaves,
growth of spindly shoots to witches' broom.
Roots are more brittle, shorter, and darker than
normal; rootlets branch excessively to root
brooms. Transmission is by budding and grafting;
no insect vector is known.
Lily Latent Mosaic
In Easter lily and tulip, symptoms masked or
systemic chlorotic mottling.
Loganberry Dwarf
Lily Mottle Potyvirus
Blackberry Dwarf. On loganberry and phenome-
nal blackberry in Northwest. Leaves are small,
obovate, rigid, with new canes short and spindly.
Young plants have crinkled leaves with some
chlorosis or necrosis along veins. Flowers are
small, drupelets ripen unevenly and tend to fall
apart when fruit is picked. Transmission is by
aphids.
It is a lily strain of Tulip Breaking Potyvirus.
Lily Ring Spot ¼ Cucumber Mosaic
Cucumovirus
Possibly a form of cucumber mosaic. There is
only a faint mottling on some species, but on
Lilium tigrinum and L. regale dark ring markings
develop into necrotic areas. The growing point is
killed; no flowers are formed; whole plant is
twisted, stunted, deformed. Peach aphid is the
vector.
Lolium Latent Potexvirus
On
ryegrass
( Lolium
perenne
and
L. multiflorum ).
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