Biology Reference
In-Depth Information
Hibiscus Chlorotic Ringspot
Carmovirus
Hyacinth Mosaic Potyvirus
Spreads by aphids. Virus caused chlorotic
spots on leaves, stunt and color-breaking of
flowers.
Caused very variable symptoms on the leaves of
Hibiscus rosa-sinensis
; from mottling and chlo-
rotic spots to vein banding and rings.
Hydrangea Latent Carlavirus
Hibiscus Latent Fort Pierce
Tobamovirus
Reported on
Hydrangea macrophylla
in U.S.A.
On
Hibiscus
.
Hydrangea Phyllody Phytoplasma
Witches' Broom, “green” flowers.
Hippeastrum Mosaic Potyvirus
Hydrangea Ring Spot Potexvirus
Virus known also as Amaryllis Mosaic Virus,
caused chlorotic streaking on leaves and flower
stalks.
Chlorotic blotches and rings, brown rings and
oak-leaf patterns are common in florist's
hydrangea. A probable cause of hydrangea
“running out.” Transmission is by cutting knife.
Virus can infect snapdragon, sweet william and
globe amaranth.
Hollyhock Mosaic
Pronounced yellow and green mottle on holly-
hock and malva.
Iris Fulva Mosaic Potyvirus and Iris
Severe Mosaic Potyvirus
Holodiscus Witches' Broom
Both potyviruses are spread generally by
aphids. For diagnostic purposes they can be
easily
On ocean spray. Diseased branches form clusters
of thin, wiry shoots with abnormally short inter-
nodes, crowded small leaves; foliage turns
bronze red early. Transmission by the spirea
aphid and by grafting.
separated
by
pinwheel
inclusions
morphology.
Iris Mosaic
¼
Iris Mild Mosaic
Potyvirus
Widespread on bulbous iris, especially serious on
Pacific Coast. Plants are stunted with yellowish
streaks on leaves and dark, teardrop markings on
white, blue, or lavender flowers, clear feathery
markings on yellow flowers. Transmission is by
peach and potato aphids. Establish disease-free
foundation stock; rogue all diseased plants; spray
for aphids.
Hop American Latent Carlavirus, Hop
Latent Carlavirus, Hop Mosaic
Carlavirus
All three carlaviruses are distantly serologically
related. Usually they are symptomless or show
mild mosaics.
