The forewings are light ocherous, the costal area and markings buff. The basal line is rounded and the outer line is sinuous, both without dentations. There is faint subterminal fuscous shading and the marginal line is fine and buff. The hindwings are white, faintly ocherous outwardly and the marginal line is fine and brownish.
|
|
Beyond the line are a series of patches of green and yellow scales arranged upon a grey strongly waved line, which continues above the oblique black bar to the costa. There is a wavy brown shade in the terminal space and a terminal black line forming dentations of the veins. The hindwings are pale brown, but broadly blackish along the margin, the termen powdered with grey. A black line edged with white powdering stars from near the anal angle.
|
|
The wingspan is 30–35 mm. Forewing greyish ochreous, with olive-fuscous shading varied with whitish; stigmata large, outlined in black; claviform elongate, orbicular and reniform with fuscous centres in a pale ring; orbicular small, often conjoined to reniform; submarginal line preceded by black dentations; hindwing white, with brownish veins and margin; the female always darker, with the hindwing wholly brownish. In the typical form the markings are distinct on a pale grey ground; — ab. sagittiferus Haw.
|
|
The forewings are pale olive brown, clouded and suffused with darker. The reniform and orbicular marks are brown, outlined in blackish mingled with white scales. The antemedial line is whitish towards the inner margin, but not clearly defined and the postmedial line is black, slightly curved and dentate, the dentations are marked with white. There are two white spots before it opposite the end of the cell and there is a black marginal line with black dots upon it, marked with white towards the angle.
|
|
The posterior longitudinal ligament is situated within the vertebral canal, and extends along the posterior surfaces of the bodies of the vertebrae, from the body of the axis, where it is continuous with the tectorial membrane of atlanto-axial joint, to the sacrum. The ligament is thicker in the thoracic than in the cervical and lumbar regions. In the thoracic and lumbar regions, it presents a series of dentations with intervening concave margins. The posterior longitudinal ligament is narrow at the vertebral bodies, where it covers the basivertebral veins, and widens at the intervertebral disc space.
|
|
The secondary wings are brownish black, with the outer margin between the dentations white; a transverse curved band of seven spots of pale pmk; viz. two spots at the anal angle are united together and subquadrate, the third and fourth are large and oblong, while the others gradually decrease in size to the seventh, which is very small. The under surface of the primary wings is like the upperside, both in colour and marking. The under surface of the secondary wings is similar to the upperside, but the spots are pinkish white, with the posterior portion of each, and the one at the anal angle entirely, rose colour.
|
|
It is transmitted via a nematode vector, Xiphinema index. This nematode acquires the virus through feeding on roots of an infected plant, and passes it on in the same manner. Host and Symptoms: The host for Grapevine fanleaf virus or GFLV is the vitis species. This includes V. vinifera, V. rupestris, and hybrids. The symptoms of GFLV are “distortion of leaves and may cause unusual chlorotic (yellow) patterns on leaves, such as a yellow mosaic or yellow veins.”(5) Plants infected with GFLV also will have a reduced size and the fruit will be softer when compared to fruit from healthy plants. The leaves will be “severely distorted, asymmetrical, cupped and puckered, and exhibit acute dentations”, these symptoms tend to look like a fan, hence the name fanleaf virus. The canes may also show signs of abnormal branching, double nodding, and short internodes.
|
|
Male. Plate X figure 5.—The primary wings deep bluish black, with the summits clearer; a greyish blue oblique band commences about the middle of the inner margm and extends to the median nervure between the first and second median nervules; this band has on its outer side, between the second and third median nervules, a quadrate white spot. The secondary wings are entirely bluish black, with the outer margin between the dentations narrowly bordered with scarlet; a transverse curved band of four longitudinal scarlet spots, with the anterior part more obscure, runs across the wing; the three first from the inner margin are of an equal size, but the fourth is smaller and somewhat quadrate. The under surface of the primary wings is black, with the summits clearer, and with two white spots between the first and third nerrales, nearer the median nervure than the outer margin.
|
|