ROSE SPRING DWARF VIRUS, (RSDaV)

Revised 3-30-2019
by Henry Kuska
retired, Associate Professor, Department of Chemistry, University of Akron
Ph.D., Physical Chemistry
 This page gives the information that I have collected from my own literature searches and from  others posting on  the internet. Please let me know if you feel anything is not clear or is not addressed at all as I am continually updating/modifying it as I get feedback.  

    Bold print in quotes does not mean that the bold print appeared in the original; the bold print was added by me (H. Kuska) for emphasis.  Information in color indicates that a link is present for further information.

     A "new"old rose disease, Rose Spring Dwarf that is not cleaned by heat treatment is back in the news for 2 reasons:

     1) The University of California, Davis published a scientific paper in 2008.  
     The above  reports that it is definitely a virus and that it is spread by aphids. 

     The virus was actually found in the Univ. of California, Davis, collection of virus indexed roses (Davis paper  Research link above). "In this test, RSDaV was detected in many different rose species and cultivars from the Foundation Rose Collection at FPS. In all, 129 plants in this collection were tested, and 77 were positive for RSDaV. Some of the hybrid rose cultivars tested positive for RSDaV included Queen Elizabeth, China Doll, Heirloom, Lowell Thomas, Jack Frost, New Dawn, Uncle Joe, Bridal White, Butterscotch, and Cynthia."

AND

     2) At the other end of the country it has been reported at the 2018 National Clean Plant Rose meeting that rose spring dwarf virus was present in 21 of the 150 rose plants in the Florida Southern College rose collection. 

      The 2018 National Clean Plant Rose meeting presentations are available at:

https://ucanr.edu/sites/ncpnrose/Network_Business/may_2017_agenda/2018_Meetings/

(I cannot see any way to directly link to an individual page in a Power Link presentation.)  On the first day of the 2018 meeting, Kevin Org presented the following results of his University's (TAMU) testing of  150 roses in the Florida Southern Collection:

       Rose Spring Dwarf (RsDAV) was found in 21 of the 150 plants tested.  Blackberry chlorotic ringspot virus (BcRV) was found in one plant, Prunus necrotic ringspot virus (PNRSV) was found in 6 plants, and Rose yellow vein virus (RYVV) was found in six plants. Four plants had mixed viruses - two had RsDAV and RYVV (Paul Neyron and Pulich Children) and two had PNRSV and RsDAV (B. rugosa ruba and Red Pinocchio).

    

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WHAT DOES IT LOOK LIKE ?

     For some roses, especially multiflora, the symptoms are severe and would be hard to miss (see Fig. 1 in the first link); however, it appears that the symptoms can range from severe dwarfing, to intermediate vein banding (see picture from Chile), to mosaic/rosette type streaks (see picture from New Zealand), to no observable symptoms.

     A picture of a rose with intermediate vein banding symptoms (that was confirmed to have rose spring dwarf) appeared in a scientific publication from Chile:


     Also please notice that: "RSDaV was detected in 24% of the analyzed samples."
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     A picture of a rose with mosaic/rosette symptoms (that was confirmed to have rose spring dwarf) appeared in a 2013 scientific publication from New Zealand.

    Rose spring dwarf was found in 20% of the roses tested.
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    What was interpreted as rose spring dwarf symptoms  was also reported recently in a scientific publication from Turkey.
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     The virus is now reported as widespread in California  

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      January 2018 general article about rose viruses from National Clean Plant Network adds rose spring dwarf virus to those listed as found world wide.

http://nationalcleanplantnetwork.org/files/276825.pdf

     The main difference between it and earlier articles (to me) is that it states: " Several viruses are found worldwide, including Prunus necrotic ringspot virus (PNRSV), Apple Mosaic Virus (ApMV), and Rose spring dwarf-associated virus (RSDaV." 

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     The vein banding and mosaic/rosette symptoms appear to be similar to some of the symptoms attributed to virus infections that have been historically called Rose Mosaic Virus.   Possibly this is the reason that there is a very recent (2019) article that states that rose mosaic virus is spread by aphids.  

    https://utahpests.usu.edu/ipm/ornamental-pest-guide/diseases/rose-mosaic

      Of course it is possible that a temperature sensitive rose virus such as PNRSV could be observed to spread in cooler climates such as Utah but not observed to spread in a southern state.

                    https://sites.google.com/site/temperatureandrosemosaicvirus/home

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My other rose virus sites can be reached from the following index page:

https://sites.google.com/site/rosevirusindexpage/