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turnip yellow mosaic virus
Turnip yellow mosaic virus is an isometric tymovirus of the family ''Tymoviridae''. Its host range is confined almost entirely to plants in the ''Brassica'' genus in western Europe, which includes cabbages, cauliflower and broccoli. Infection causes bright yellow mosaic disease showing vein clearing and molting of plant tissues.
==Transmission==
It is transmitted by sap as well as a host of insect vectors. The most prominent of these are in the ''Phylotreta'' and ''Psylliodes'' genera of flea beetles, although ''Phaedon cochleariae'' and its larva have also been known to help spread this virus. The larva lose their ability to transmit the disease once they reach the pupal stage, suggesting a mechanical infection process.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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