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‘R. multiflora’ & Rose Rosette Disease The Good, The Bad, The Ugly The White Menace.

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Presentation on theme: "‘R. multiflora’ & Rose Rosette Disease The Good, The Bad, The Ugly The White Menace."— Presentation transcript:

1 ‘R. multiflora’ & Rose Rosette Disease The Good, The Bad, The Ugly The White Menace

2 This Program Services Committee presentation created by: Mary Peterson Master Rosarian

3 ‘R. multiflora’

4 Plants of ‘R. multiflora ’

5 Fields overgrown with ‘R. multiflora’

6 Flower clusters of ‘R. multiflora’ Photo by John Lynch

7 Panicles of ‘R. multiflora’ flowers Photo by James Miller

8 ‘Achenes’ or rose seeds of ’R. multiflora’

9 Northern Mockingbird and Multiflora Rose Hips Photo by Johann Schumacher

10 Distribution of ‘R. multiflora ‘ (green areas = areas of ‘R. multiflora’) (white areas = none reported)

11 Photo by S. Debolt ‘R. multiflora’ infected with Rose Rosette

12 “Witches Broom” Photo by James W. Amrine Jr. Photo by M.A. Hansen Photo by Ann Peck

13 Abiotic damage to foliage from RoundUp ® Photos by Baldo Villegas Entomology Dept. UC Davis Photo by M.A. Hansen

14 Photos by Ann Peck Reddish aberrant new growth on modern roses infected with RRD

15 Photo by Chris Evans Typical Rose Rosette growth on ‘R. multiflora’ roses

16 Distorted bud formation on a modern rose infected with RRD Photo by S. Debolt

17 Photo by James W. Amrine Jr. Typical Red New Growth of RRD Infected plant

18 Twisted stem growth on RRD infected plant

19 Symptomatic thorns on roses caused by rose rosette Photo by S. Debolt Photo by Jim Yearwood

20 Mowing and burning operation Physical Control of stands of ‘R. multiflora ’ Rose bushes cut with a chain saw during the winter months After spending approximately 2 months cutting Multiflora rose bushes, burning them was very satisfying

21 Eriophyid Mites Biological Control of RRD

22 Microscopic Eriophyid Mites Phyllocoptes fructiphilus Keifer

23 Rose Stem Girdler Photo by Whitney Cranshaw Girdled cane caused by larva Photos by James W. Amrine Jr. A "flag" caused by the break of a cane at the girdle Close up of girdle and broken cane Agrilus aurichalceus (Coleoptera: Buprestidae)

24 Rose Seed Chalcid Wasp Photo by James W. Amrine Jr.

25 Rose Seed Chalcid

26 Seed parasitism by the Chalcid Wasp

27 Rose hips damaged by Chalcid wasp

28 Cold Weather Affect on New Rose Growth Spring Dwarf Disease?

29 ‘R. multiflora’ and RRD Early Identification of RRD infected ‘R. multiflora’ Physical Control – cutting/burning Herbicide/Chemical – Round Up, Krenite, Banvel Biological Control – Eriophyid Mite Rose Seed Chalcid Rose Stem Girdler

30 What The Future Holds … The reduced populations of multiflora rose remaining after the RRD epidemic are likely to be infested by the seed chalcid at the same rate (90-95%) as plants in Korea and Japan. Multiflora rose will then be another occasional plant in the environment, and not the noxious weed that it is today. It is estimated that this scenario will transpire within the next three to five decades. Farmers and others wanting eradication of multiflora rose desire human intervention to increase the rate of spread of the disease, the mite and the torymid into uninfested areas. However, many rosarians desire that all augmentation work with RRD and the mite cease. The rose seed chalcid could be intentionally released in areas wherever infestation rates are below 50-60%. Risk to other rose species from this seed chalcid appears to be minimal. Even if not deliberately spread, its range will increase by birds. Eventually, multiflora rose will be reduced to low levels, occurrence of RRD will become minimal and problems for farmers and rosarians alike should be greatly reduced.

31 Dr. Keith Zary (VP of research for Jackson & Perkins) has encouraged breeders to concentrate their efforts on hybridizing roses that are RRD resistant and RRD tolerant. A species called the McCartney rose, which exists as a weed in Texas, is susceptible to RRD but resistant to feeding by the mites that transmit the disease. It may be possible, through breeding techniques, to incorporate this mite resistance into cultivated roses in the future. In the meantime, it would be wise to assume that all cultivated roses are potentially susceptible to the disease and to be on the lookout for symptoms of rose rosette. Additional Considerations…

32 Program Services Committee John Mattia, Chairman Jolene Adams Richard Donovan Pat Hibbard Larry Peterson Mary Peterson Diane Schrift

33 Program Services Power Point programs on roses are available for download from the ARS website, ‘members only section.’ They are offered to our members for use by a local or district rose society or an ARS judging or consulting rosarian school. These programs are copyright © ARS 2007 Commercial use is strictly forbidden.

34 The End


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