Osbornellus borealis DeLong & Bohr 1936a: 976
Description & Identification
Medium size, slender species. Length of male 4.40—5.00 mm., female 5.00—5.60 mm. (Nielson, 1968)General color yellowish brown. Crown and pronotum with yellow and brown markings; elytra subhyaline with veins suffused with yellow brown, few cells ivory(Nielson, 1968)Pygofer in lateral aspect about as long as wide, caudal margin obliquely convex; aedeagus in lateral aspect with two basal processes extending laterally along shaft and protruding beyond apex of shaft; aedeagal shaft narrow, tubelike, slightly attenuated apically; gonopore subterminal; style in dorsal aspect with apices long, narrow; female seventh sternum in ventral aspect with caudal margin truncate (Nielson, 1968)This is the only species in the genus Osbornellus that is a vector of a plant virus. (Nielson 1968)
Biology & Ecology
Little is known on the biology of this species. In 1955, Wolfe (866) collected it from Ceanothus velutinus Dougl. ex Hook. and sweet cherry in Washington. Nielson and Kaloostian (568) trapped populations in peach and cherry orchards in Utah in 1956. Populations were highest in September. In California in 1957, Jensen (396) collected nymphs from myrtle (Myrtus communis L.) and California privet (Ligustrum ovalifolium Hassk) (Nielson, 1968)
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It is known only in the Western United States and western Canada. It has been reported from Washington by Wolfe in 1955 (866), Utah by Nielson and Kaloostian in 1956 (568), southern British Columbia, southern Alberta, and southern Saskatchewan by Beirne in 1956 (58), and California by Jensen in 1957 (396). (Nielson, 1968)
This species is a vector of the yellow leaf roll strain of western X-disease virus of peach in California. Jensen (396) was first to report transmission by this species in 1957. Infections were produced from diseased peach to seven of nine healthy celery plants and one of four healthy peach trees. The insect spent 45 days on the inoculum. Celery was much more susceptible to the virus than peach.(Nielson 1968)This species is not considered an important vector of this strain of the virus.(Nielson 1968)
Jensen, D.D. 1957. Transmission of peach yellow leaf roll virus by Fieberiella florii (Stål) and a new vector, Osbornellus borealis DeL. & M. Journal of Economic Entomology, 50: 668-672
* Citations of Phytoplasma occurrance in Osbornellus borealis DeLong & Bohr 1936a: 976 have been exctracted from the database of Hemiptera-Phytoplasma-Plant (HPP) biological interactions worldwide (Valeria Trivellone. (2019). Hemiptera-Phytoplasma-Plant dataset (v1.2) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.2532738).