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Plum pox, also known as sharka, is the most devastating viral disease of stone fruit from the genus ''Prunus''. The disease is caused by the plum pox virus (PPV), and the different strains may infect a variety of stone fruit species including peaches, apricots, plums, nectarine, almonds, and sweet and tart cherries. Wild and ornamental species of ''Prunus'' may also become infected by some strains of the virus. The virus is transmitted by aphids and by the transfer of infected plant material to new locations. Plum pox poses no danger to consumers, but it can ruin the marketability of stone fruit by causing acidity and deformities. The only way to manage the disease is to destroy all infected trees, which can cause significant economic losses. ==Biology== The plum pox virus is a linear single stranded RNA virus.〔International Committee on the Taxonomy of Viruses. 2002. (Plum pox virus ) 〕 There are six strains of plum pox virus: PPV-D, PPV-M, PPV-EA, PPV-C, PPV-Rec (Recombinant), and PPV-W. PPV-M isolates are more aggressive in peach, are aphid vectored more efficiently, and spread more rapidly in an orchard.〔APHIS. (Plum Pox Potyvirus Disease of Stone Fruits ) 〕 PPV-M has been reported to be seed transmitted, the other PPV strains are known not be transmitted through seeds. Both PPV strains M and D infest peach, plum, and apricot. PPV-C infects sweet and tart cherry naturally and is the only strain known to do so, it has infected other ''Prunus'' hosts experimentally. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Plum pox」の詳細全文を読む スポンサード リンク
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