Biology Reference
In-Depth Information
Cucurbit Leaf Curl Begomovirus
Dahlia Ring Spot
On pumpkin, cucumber, muskmelon, honeydew,
zucchini, banana squash, and squash.
Caused by a strain of Tomato Spotted Wilt Virus
Tospovirus. Leaves have concentric rings or
irregular zigzag markings. In Utah a yellow strain
causes bright yellow rings and zigzags.
Cucurbit Leaf Crumple Begomovirus
Dasheen Mosaic Potyvirus
On cucumber.
Widespread in plants from Araceae family.
Cucurbit Yellow Stunting Crinivirus
Delphinium Ring Spot
On melon.
Faint chlorotic rings around green and yellow
centers appear on young leaves, irregular necrotic
spots or rings with yellow bands on mature
leaves.
Currant (Red) Mosaic
¼
Tomato
Ringspot Nepovirus
Irregular, light green circular spots along midrib
and larger veins enlarge to bands. Canes are
stunted; plants decline.
Desmodium Mosaic Potyvirus
Transmitted by aphids, sap and seeds. Leaf sap
contains only a few filamentous (775 nm length)
virus particles.
Cymbidium Mosaic Potexvirus
Virus was isolated from many orchid species
showing mosaic symptoms. It is transmitted by
contact between plants.
Desmodium Yellow Mottle Tymovirus
Transmitted by mechanical inoculation. Leaf sap
contains many isometric (30 nm diameter)
virions.
Dahlia Mosaic Caulimovirus; Stunt
General. Bands along midrib and veins remain
yellow-green. In some varieties leaves are
distorted and blistered; in others, leaves are
yellowed with margins up-rolled; in others,
plants are very short and bushy with short flower
stems. Transmission is by peach and other aphids.
Diodia Vein Chlorosis Closterovirus
Transmitted by
Trialeurodes abultilonea
; caused
chlorotic vein banding and chlorosis of
Diodia
virgianiana
plants.
Dahlia Oakleaf
Dodder Latent Mosaic
May be a separate entity or a strain of Tomato
Spotted Wilt Tospovirus. A pale chlorotic line
across the leaf suggests the outline of an oak leaf.
Three species of dodder transmit mosaic to can-
taloupe, potato, tomato, and celery.
