Biology Reference
In-Depth Information
the last may be severely crippled or killed. Trans-
mission is by peach and cabbage aphids. Protect
seedlings by spraying or screening seedbeds.
White Line Mosaic
A mosaic disease of sweet and dent corn with
short chlorotic lines along leaf veinal tissue.
Walnut Brooming Disease
Wild Cucumber Mosaic Tymovirus
Bunch Disease. Presumably virus.
Occurs in California and Oregon. Virus caused
mild leaf chlorosis on natural hosts:
Marah
sp.
and
Echinocistis
sp.
Watermelon Curly Mottle
Bigeminivirus
Occurs in Arizona. Infected
Citrullus lanatus
and
Cucumis melo
var.
cantalupensis
plants showed
leaf necrosis, vein banding, curling and stunting
symptoms.
Wineberry Latent Virus
Known as Loganberry Calico Virus induced cal-
ico disease-like symptoms on blackberry. Virus
is transmitted by mechanical inoculation and
by grafting but on many
Rubus
sp. remains
symptomless.
Watermelon Mosaic Potyvirus
In Florida and probably other states. Symptoms
include mild interveinal chlorosis, stunt, distor-
tion, mottle, consisting of green bands along veins
or raised green blisters. Leaf apices often form
long narrow, sometimes twisted projections,
“shoestrings.”A yellow strain of the virus causes
more yellow spotting with less shoestring effect.
Wisteria Mosaic
Diffuse yellowish blotches with scattered green
islands; mature leaflets twisted.
Wisteria Vein Mosaic Potyvirus
Watermelon Silver Mottle Tospovirus
On wisteria.
On watermelon.
Yellow Mottle Begomovirus
Wheat Streak Mosaic Rymovirus
On okra.
Zucchini Yellow Mosaic Potyvirus
On wild rice (
Zizania
); foliar streak symptoms
with chlorotic areas becoming necrotic with
eventual leaf death.
On cucurbits, melon,
squash, pumpkin and
watermelon.
White Clover Mosaic Potexvirus
Zygocactus Montana X Potexvirus
Known also as Clover Mosaic Virus and Pea Wilt
Virus, caused systemic mosaics and chlorotic
mottlings on clover plants. Virus is transmitted
by contact between plants and by seeds.
Serologically related to many potexviruses,
caused reddening of pads of infected
Zygocactus
truncatus
plants. It was found in the USA but
there is not evidence of spread.
