When I first found this paper today, it stated that the full copy was available, but when I clicked the link it did not come up. The link now works:
http://link.springer.com/content/pdf/10.1007%2Fs00705-013-1686-7

Of particular interest to me is the discussion about the possible mode of transmission:

" None of the KITC, IGN, CCC, and PTK motifs [11, 37] are present in the RoYMV HCPro. Instead, a putative C-2x-C eriophyid mite transmission
motif [39] is found at amino acid residues 48-51 at the N-terminus of the protein, suggesting that this virus may possibly be transmitted by eriophyid mites."

Here is a link that might be useful: link to full paper

I received an e-mail that the second link that I sent only gave the first 2 pages. I went to my wife's computer and yes only the first 2 pages came up. Try this link:

http://link.springer.com/article/10.1007/s00705-013-1686-7/fulltext.html

If that also will not work, the following discussion is worth pointing out:

"As mentioned above the RoYMV HC-Pro is missing the aphid-transmission motifs. Similarly, the DAG aphid transmission motif, found at the N-terminus of the CP peptide [20], is missing from the CP of RoYMV. Both HC-Pro and CP mediate aphid transmission of members of the genus Potyvirus. While, as discussed above, the other peptides have similarities to viruses from almost all of the genera of the family Potyviridae, the HC-Pro and the CP amino acid sequences were determined by BLASTP analyses to be similar only to those of members of the genus Potyvirus, which are known to be aphid transmitted [9]. Rose cultivars are clonally propagated [16]. It is possible that RoYMV may have originally been transmitted by aphids and that aphid transmission was lost during an extended period of continuous vegetative propagation."

Here is a link that might be useful: try this link

Well this morning the two links (that worked for me yesterday on my computer) today only give the first 2 pages. Fortunately I had saved the manuscript yesterday.

The following from the full paper was also of interest to me:

"The common rose viruses apple mosaic virus (ApMV) (synonym rose mosaic virus [RMV]) and prunus necrotic ringspot virus
(PNRSV) usually express symptoms early in the season, and the plants become asymptomatic later, with no possibility
to detect these viruses. In contrast, the symptoms caused by RoYMV [19] persists throughout the season, and the virus can be detected. One possible explanation could be the suppression of posttranscriptional gene silencing [37], which is reported to be manifested by the P1 [33, 40]
or HC-Pro [4, 30] peptides from members of the family Potyviridae."

H.Kuska comment. Thus, the temperature dependence that has been the unappreciated "monkey wrench" in some of the earlier rose virus transmission studies that were done in warm climates does not complicate the behavior here. See: http://home.roadrunner.com/~kuska/high_temperature_effect_on_pnrsv.htm

Here is a link that might be useful: my temperature effect discussion

Henry,
Did they mention of the plants known to be infected but asymptomatic at other times in the season also tested free by pcr replication? (I know the replication is redundant, but virus talk is not my first language.)

PCR is generally considered more sensitive than ELSIA so normally more samples are expected to be detected as infected by PCR than by ELSIA, but there still is a limit of sensitivity of PCR. Often even samples that pass a PCR test will still have to pass a quarantine type time test.

One 2011 literature example:

http://www.cabdirect.org/abstracts/20123084671.html

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In another thread one of the authors comments that another paper should appear soon:
http://www.rosebreeders.org/forum/read.php?2,51531

Here is a link that might be useful: link for virus testing example cited above

"treatment probably depresses the amount of viral particles temporarily below the threshold level of detection of used diagnostic methods. In the course of further cultivation, the virus recovered-up and re-accumulated to a level of detection. "

Not unexpected, but depressing, nonetheless. Even if only for that particular study.

OT: it's a darned shame that the CAB database isn't accessed by more university systems.

Regarding the comment: "Even if only for that particular study."

The following link gives evidence that I have collected that I feel shows that that study is similar to what others have reported.

http://home.roadrunner.com/~kuska/discussion_of_whether_virus_have.htm

Here is a link that might be useful: link for above