Biology Reference
In-Depth Information
Ribgrass Mosaic Tobamovirus
Rose Yellow Mosaic
It
is
ribgrass
strain of Tobacco Mosaic
Chlorotic areas are brighter and lighter yellow
than in typical rose mosaic; there is less pucker-
ing of leaves.
Tobamovirus.
Robinia Brooming
Saguaro Cactus Carmovirus
Locust Witches' Broom.
▶
Symptomless on Saguaro cactus plants. Virus
was found in Arizona but there is no evidence
of spread.
Rose Mosaic
Infectious Chlorosis. Common on garden roses
on the Pacific Coast, sometimes on greenhouse
roses in the East and on garden roses originating
in the West. Chlorotic areas feather away from
midribs of leaflets, often with local distortion,
sometimes with ring, oakleaf and watermark pat-
terns. Plants are dwarfed, with buds often bleached,
imperfect, on short stems. The virus is carried in
understock and infects tops after budding or
grafting; no insect vector is known. More than
one virus is probably involved. Much rose mosaic
seems to be due to the Prunus Necrotic Ring Spot
and Apple Mosaic Ilarviruses. Rootstocks can be
heat-treated to provide a virus-free source.
Schefflera Ringspot Badnavirus
Bacciliform particles were found in
Brassica
actinophylla
.
Shamrock Chlorotic Ringspot
Potyvirus
Caused chlorotic Ringspot on leaves and decline
of
Oxalis regnellii
plants.
Smithiana Potex Virus
Rose Rosette
Infected plants are usually symptomless.
On species roses, Wyoming, California. Leaflets
and flower parts are misshapen, stems dwarfed,
with precocious growth of lateral buds, indefinite
chlorotic pattern in leaves, increase in thorniness
of stems. The general effect resembles 2, 4-D
injury. Graft and mite transmissible, but the dis-
ease develops slowly.
Solanum Yellows Luteovirus
Occurs on potato plants.
Sonchus Yellow Net
Nucleorhabdovirus
Rose Streak
On lettuce.
On rose in eastern United States. Leaves have
brownish or reddish ring and vein-banding pat-
terns; stems have ring patterns and sometimes
necrotic areas near inserted buds, causing girdling,
wilting of foliage. Transmission is by grafting.
Sorghum Chlorotic Spot Furovirus
Found only in Kansas; caused chlorotic spot on
infected plants.
