Macropsis fuscula (Zetterstedt)Membracoidea : Cicadellidae
|Diseases Transmitted||Pathogen Type|
|Crops Affected by Macropsis fuscula (Zetterstedt)|
This species is a vector of rubus stunt virus of several wild and cultivated species of Rubus in the Netherlands and England. Fluiter and van der Meer (264) were first to report transmission of this virus by fuscula in 1953, and this represented one of the first evidences of a leafhopper-borne virus in Europe. Transmission was obtained in field tests where healthy plants were exposed in a virus-infected raspberry planting infested with leafhoppers. Percent transmission varied from 3 to 50. In later tests leafhoppers reared on virus-infected raspberry plants were transferred to healthy plants and allowed to feed from 1 to 21 days. Transmission was effected to 19 out of 105 plants tested. The latent and retention periods were long, but the exact number of days was not determined. Transmission occurred in raspberry fields in July, August, and September when leafhopper populations were greatest.
This species is the most important vector in the natural spread of rubus stunt virus in England and the Netherlands.
Small, robust species. Length of male 4.20—4.50 mm., female 4.50—5.00 mm.
General color bight brown to dark brown. Crown tan with two black spots on anterior margin; pronotum tan with black irregular markings near anterior margin; elytra light brown to dark brown, veins nearly black; color deeper in males.
Pygofer in lateral aspect about as long as wide; curved spine arising from caudoventral margin, spine very long, narrow, extending beyond dorsal margin of pygofer and projecting dorsocephalad; aedeagus in lateral aspect, simple, broad basally, attenuated apically, tubelike, curved laterally, gonopore subapical; Style in dorsal aspect long and slender, apical two-thirds tubelike, apex curved laterally; female seventh sternum in ventral aspect with caudal margin broadly convex (fig. 15).
This species is so similar to scotti that it is difficult to separate on the basis of the genitalia and other characters. In 1964, Wagner (844) separated fuscula from scotti by the shape of the lorum, which is short and broad in the former species. Color variations were evident but not recommended for separating the species. I have followed Wagner (843, 844) after he carefully studied several species in which he concluded that nassatus, nitidula, and rubi were conspecific with fuscula in 1950 and 1964. Beirne in 1954 (56) synonymized tibialis on the basis that it was a color form of fuscula, but Wagner in 1964 (844) synonymized it under scutellata.
|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.|