Biology Reference
In-Depth Information
Beet Western Yellows Luteovirus
Blackberry Variegation
In Europe known as Beet Mild Yellowing
Luteovirus. More than 150 species from
23 families are susceptible. Virus-transmitted by
insects but principal natural vector is
Myzus
persicae
.
On raspberry and blackberry. Infected leaves are
nearly white at maturity.
Blackeye Cowpea Mosaic
On urd bean.
Beet Yellow Net Luteovirus
Blueberry Leaf Mottle Nepovirus
On beets and chard. Leaves have a yellow net-
work of veins against a green background. Trans-
mission by the peach aphid.
Reported on cultivars Rubel and Jersey in
Michigan. Virus is transmitted by pollen and by
honeybees which carry the pollen.
Beet Yellows Closterovirus
Blueberry Necrotic Ring Spot
On beets and spinach. Outer and middle
leaves are yellowed, thickened, brittle, with chlo-
rotic areas waxy. Vectors are peach and bean
aphids.
A strain of tobacco ring spot virus, causing
stunting and distortion; transmitted by dagger
nematodes.
Bidens Mottle
Blueberry Necrotic Shock Ilarvirus
On
Rudbeckia, Zinnia
, and
Ageratum
.
Leaf and flower necrosis symptoms occurred for
1-4 years, then plants recover and remain
symptomless.
Bidens Mottle Potyvirus
On
Rudbeckia, Zinnia
, and
Ageratum
.
Blueberry Red Ring Spot Caulimovirus
Blackberry Dwarf
Red spots and rings, oak leaf patterns.
Loganberry Dwarf.
▶
Blueberry Ring Spot
Blackberry Dwarfing
A minor disease chiefly on Cabot with red rings
and dots in leaves.
On brambles in California.
Blueberry Scorch Carlavirus
Blackberry Mosaic
Transmitted by grafting, it caused marginal chlo-
rosis and necrosis of leaves but some cultivars
remain symptomless.
Mottling, crinkling, vein clearing and distortion.
