Euscelis lineolatus Brullé 1832a: 109Membracoidea : Cicadellidae
|Diseases Transmitted||Pathogen Type|
|Green petal disease 16SrI-C||Phytoplasma|
|Crops Affected by Euscelis lineolatus Brullé 1832a: 109|
This species is a vector of the clover phyllody virus causing green petal in strawberry and clover witches’ broom virus of clover in England. In 1956, Frazier and Posnette (276) were first to report transmission of these viruses and later in 1957 they (277) presented details of their experiments. Colonies of uneolata including variants transmitted clover phyllody virus from clover and strawberry to clover and numerous other plants, but not from strawberry to strawberry. Witches’ broom virus was transmitted to carrot, celery, mayweed, plantain, potato, and tomato plants. The latent period of both viruses in the insect varied from 23 to 45 days. Phyllody virus was retained by the vector for 58 days and witches’ broom virus for 84 days.
This species is considered an important vector of these viruses in England.
Small, robust species. Males macropterous, females submacropterous. Length of male 3.40—3.90 mm., female 4.70 mm.
General color light brown. Crown and pronotum light brown with dark spots or markings; elytra finely reticulated with light-brown markings.
Pygofer in lateral aspect about 1½ times as long as wide, caudoventral margin produced posteriorly to narrow, fingerlike lobe, which projects posterodorsally; aedeagus in lateral aspect very broad basally, narrow, and attenuated at apical three-fourths; shaft broad in ventral aspect; gonopore subterminal; style in dorsal aspect simple, apex narrowed; female seventh sternum in ventral aspect with caudal margin distinctly truncate (fig. 88).
This species is closely related to plebeja and can be separated by the male pygofer with the caudoventral margin produced posterodorsally to a broad fingerlike lobe. Typical lineolata does not have the paired short spines on the apex of the aedeagal shaft whereas typical plebeja does.In 1957 and 1958, Muller (534, 535) produced some remarkable results showing the variation of aedeagal types among species of Euseelis that were affected by day length. As a consequence of this work, Muller concluded that bilobata, stictoptera, and galiberti were seasonal variants of Uneolata. Both bilobata and lineolata types of aedeagus were produced under day lengths of less than 16 hours whereas stictoptera and galiberti forms were produced under day lengths of more than 16 hours.
|Nielson, M. W. 1968b. The leafhopper vectors of phytopathogenic viruses (Homoptera, Cicadellidae). Taxonomy, biology and virus transmission. United States Department of Agriculture Technical Bulletin . 1382 386 pp.|