Is This Pattern Indicative of a Virus?
Last season a few leaves on Hosta Winfield Blue showed these markings . At first I thought it was the wax wearing off, or sunburn, until I looked closer and saw how uniform the pattern was.
I was content to take a wait and see attitude, to see if it shows up again, but now that spring is on the horizon, I'm feeling more curious about what caused this. Any thoughts?
Comments (16)
- 7 years ago
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Comments (19)Malcolm Manners, thank you for pointing out the distinction between the two names. I checked the internet and apparently "biological index" is the general term and the two subterms are herbaceous index and woody index. Davis in their 2004 web article "The Rose Clean Stock Program" use the term "biological index". I am interested in any literature comparing the 2 subterms for rose virus testing. I did find the following for Rubus: "Transmission to herbaceous indicators CRLV, ApMV, BRLV (and indeed TSV in general) can be transmitted by inoculation of sap to herbaceous test plants and can usually be detected in this way. Grind rapidly growing leaves from Rubus plants to be tested in a small volume of 2%, nicotine solution with a little celite as abrasive. Gently rub this sap extract on leaves of young, soft, rapidly growing plants of Chenopodium quinoa and/or Cucumis sativus. Keep test plants in aphid-proof glasshouses at about 20°C and observe for symptoms over about 3 weeks, Symptoms caused by these viruses in inoculated leaves should be apparent in 4-10 days. BRLV and ApMV are probably best detected in very young cucumber cotyledons, but all viruses should induce symptoms in C. quinoa. All four viruses should become systemic in C. quinoa, but some strains of tobacco streak virus (BRLV is a strain of TSV) are not systemic in this host. Woody indicators While the nepoviruses and ilarviruses could be detected by grafting Rubus to woody indicators, there is no purpose in doing so for the alternative methods are much superior. In the case of RLCV, however, this is the only method of detection. Graft scions of test Rubus plants to Rubus phoenicolasius (wineberry) which develops particularly severe symptoms. In general, R. idaeus can also be used. Symptoms may take 2-12 months to appear after graft inoculation. The two strains of RLCV (alpha and beta) are both detected." http://74.125.93.132/custom?q=cache:IolSYfkHYSoJ:archives.eppo.org/EPPOStandards/PM3_PROCEDURES/pm3-31-e.doc+rubus&cd=2&hl=en&ct=clnk&gl=us&client=google-coop ------------------------ "Rubus is a large genus of flowering plants in the rose family, Rosaceae" from ( http://en.wikipedia.org/wiki/Rubus ). Here is a link that might be useful: link for rubus indexing...See Morenew rose rosette virus symptom?
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7 years agoHi Sandy,
Sorry to see it, as always, but I have to agree with the others that this looks like HVX. It could be possible that you have it somewhere else in the garden and have been inadvertently spreading it, or it came in on one of the neighboring plants, or maybe you just didn't notice small symptoms during the prior years.
Take a close look at the plant next to it, lower right, and you can see what may be virus symptoms - is that Golden Tiara? It is one that very often has HVX in the trade.
If you are thinking about getting rid of it then while it is dormant is the time to do it. Otherwise you may have to wait until next fall. For some reason HVX doesn't transfer over when the plants are not actively growing. I'll drop you an email too.
Chris (this picture may show larger than I expected - open it in a new window and maybe it will be correct?)
sandyslopes z6 n. UT thanked ctopher_mi- 7 years agolast modified: 7 years ago
Chris, thanks for such a quick answer. Funny that I didn't recognize this as HVX. It just doesn't look like the typical inkbleed that I'm used to seeing.
Yes, you're right about that being a Golden Tiara next to it. Now that I look closer at that one, I do see some questionable leaves, but to me it looks so subtle. Maybe a little inkbleed along some veins and some with slight tissue collapse. GT was planted a year earlier from another online plant vendor, but not one that specializes in hostas.
Golden Tiara
I don't ever cut leaves or scapes, but I suppose there's other ways it could have spread. If hail damage causes sap to exchange, (or roots touching each other?), then I might have a lot of them infected in that one area. I'll keep a watchful eye on them now.
Right now the two in question are under a few inches of snow and a layer of leaves, but as soon as I can, I'll go out and dig out both of them before they start growing. ....How sad it was to write that. :-(
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