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Rose Rosette Disease. Contagious Fatal Sneaky. What is it?. Uhhh . . . We don’t know. ?. Disease (It could be . . .). A virus or virus like particle A sequence of single or double stranded RNA Electron Micrograph studies . . . . . . nothing conclusive. Disease What does it infect?.

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rose rosette disease

Rose Rosette Disease

Contagious

Fatal

Sneaky

what is it
What is it?
  • Uhhh . . . We don’t know.

?

disease it could be
Disease (It could be . . .)
  • A virus or virus like particle
  • A sequence of single or double stranded RNA
  • Electron Micrograph studies . . .

. . . nothing conclusive

disease what does it infect
Disease What does it infect?
  • Most native roses are susceptible as well as R. multiflora and all cultivated rose species.
  • The result of RRD infection is DEATH!!!!!
origin of rrd
Origin of RRD

Rosa multiflora

  • Introduced to N. America in late 1700’s for gardens and cultivar rootstocks.
slide6

Rosa multiflora

  • Spread by the Government for . . .
    • cattle barriers
rosa multiflora
Rosa multiflora
  • Spread by the Government
    • cattle barriers
rosa multiflora8
Rosa multiflora
  • Spread by the Government
    • cattle barriers
    • stop erosion
    • create wildlife habitats
    • crash barriers for highways
origin of rrd9
Origin of RRD

Rosa multiflora

  • OOPS!!!!! (Big Mistake)
  • Rosa multiflora now classified as an invasive species:
    • Very hardy
    • Very promiscuous
    • Impossible (nearly) to clear
    • Each hip contains thousands of seeds

Gee . . . How can we kill this STUFF?!

slide10
RRD!
  • First identified as “Witches’ Broom” in the 1940’s in Manitoba, Canada.
  • In late 90’s, RRD was spread mechanically by the enemies of Rosa multiflora (i.e. government funded scientists researching for a biocontrol)

Multiflora stands = Reservoirs for RRD

how does it get around
How does it get around?

^

  • Disease transmitted by eriophyoid mite

microscopic!

Phil !

Phyllocoptes fructiphilus

dormancy winter rest in roses
Dormancy/ winter rest in roses
  • Decrease in light triggers shutdown of chlorophyll production in leaves
  • As leaf shuts down, the stomata close
  • Upward water movement ceases
  • Free water binds to starches to form sugars called colloids (a.k.a. bound water)
  • Bound water acts as antifreeze, protecting the canes from drying out over winter
  • the bigger the plant cells, the more bound water is stored.
stages of infection
Stages of Infection

Phil transmits RRD when he bites the rose.

Symptoms of the disease appear from the point of infection to the new growth of that branch.

.

Free water retreats to the larger canes and is bound in the cells in the fall . . .

. . . the infection travels with it. ***** (see the notes for this slide)*****

Next spring, the plant will show symptoms in all new growth.

symptoms of infection as seen on new growth
Symptoms of Infection(as seen on NEW GROWTH)

False Alarms

  • New growth
  • Witches’ Broom
  • 2,4-D damage
  • Yellow mosaic pattern on leaves
  • Distorted foliage
  • Herbicide Drift damage (this w/ yellowing caused by 2,4-D)
  • Vegetative blooms
  • Hyper-prickliness
  • Vegetative blooms
  • Symptomatic canes that are wider than the healthy canes from which they grew
  • Growth nodes will be close together
more false alarms
More False Alarms
  • ‘Normal’ funky growth
    • Discolored canes
    • Blind shoots
    • Rootstock suckers
  • Zinc deficiency
  • Cold damage
risk increasers
Risk Increasers
  • Tall roses (large surface area)
  • Close plantings with canes touching
  • Nearby stands of multiflora
  • downwind
  • Lotsa roses!!
  • Rose gardens atop a hill
  • ‘Drop zones’ (spots in the yard where dead air would cause mites to drop on unlucky roses planted there)
slide32

How do you treat an infected bush?

  • Spray bush with miticide

2. Dig up bush and garbage bag it, DON’T COMPOST

3. Carefully remove remaining roots

4. Maybe spray surrounding bushes

5. Cut off infected cane from bud union ***

*** Only effective in early detection. Not recommended.

educated guess
Educated Guess
  • RRD may be an excess of growth accelerant or stimulant that forces the plant to spend energy faster than it can replenish that energy.
  • RRD symptoms similar to herbicide damage, specifically 2,4-D.
  • The herbicide 2,4-D is a synthetic auxin (plant version of a growth hormone) that kills plants by using up their energy stores faster than they can be replenished, essentially making the plant grow itself to death.

The “hypothesis” I am investigating currently is whether the mode of action of RRD is similar to that of 2,4-D.

sources of wisdom
Sources of Wisdom
  • Amrine, J. W. Jr. 22 Multiflora Rose. Division of Plant and Soil Sciences, West Virginia University, Morgantown, West Virginia, USA. <http://www.invasive.org/eastern/biocontrol/22MultifloraRose.html>. 5 November 2003.

2. Ann Peck. Rose Rosette Disease: a Web Book. <http://www.rosegeeks.com>. 20 May 2007.

3. Chuan Hong, et all. Rose Rosette Disease. Virginia Cooperative Extension. Publication Number: 450-620 <http://www.ext.vt.edu/pubs/plantdiseasefs/450-620/450-620.html>. May 2002.

4. Kevin Glaes. For information on the dormancy process in roses, meristem production, revisions, and more.

Feel free to contact me with questions: James R Redington,

347 Leedy Way E., Chambersburg, PA 17202, jr3188@ship.edu