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Diff: Rose Rosette Disease

Comparing revision #1 (2026-06-06 19:07:49) with revision #2 (2026-06-07 19:41:44).

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== Rose Rosette Disease ==	== Rose Rosette Disease ==

Rose Rosette Disease, often shortened to RRD, is a serious viral disease of roses. It is associated with distorted new growth and is spread primarily by eriophyid mites and by grafting. There is no cure for a systemically infected rose.	Rose Rosette Disease, often shortened to RRD, is a serious viral disease of roses. It is associated with distorted new growth and is spread primarily by eriophyid mites and by grafting. There is no cure for a systemically infected rose.

=== Do not diagnose from red growth alone ===	=== Do not diagnose from red growth alone ===
Many healthy roses produce red, bronze, or burgundy new growth. Colour by itself is not enough for an RRD call. A useful diagnosis looks for a pattern of abnormal growth, compares it with the rest of the plant, and considers recent herbicide exposure, weather stress, insect damage, vigorous basal breaks, and normal cultivar behaviour.
	Many healthy roses produce red, bronze, or burgundy new growth. Colour by itself is not enough for an RRD call. Compare the affected cane with the rest of the plant, the cultivar's normal growth, recent herbicide exposure, weather stress, insect damage, and whether the symptoms are spreading.

=== Symptoms worth photographing ===	=== Symptoms worth photographing ===
* Dense witches broom or rosette-like clustering of shoots.	* Dense witches broom or rosette-like clustering of shoots.
* Excessively thorny, soft, pliable new growth that looks unlike the plant's normal canes.
* Distorted, narrowed, strapped, twisted, or stunted leaves.
	* Excessive soft, pliable thorniness on new growth that looks unlike the plant's normal canes.
	* Distorted, narrow, strapped, twisted, or stunted leaves.
* Buds or flowers that abort or deform.	* Buds or flowers that abort or deform.
* One cane or section showing abnormal growth that spreads over time.
* Decline, dieback, or repeated abnormal flushes after the growth should have hardened.

=== Common look-alikes ===
* Normal red new growth on healthy roses.
* Herbicide drift or residue, which can cause narrow leaves, stunting, yellowing, and witches broom-like distortion.
* Chilli thrips, spider mites, aphids, sawfly larvae, and other pest injury.
* Heat, drought, root stress, transplant shock, overfertilising, or spray burn.
* Vigorous basal breaks, which can look dramatic but are often healthy.

=== Common false alarms ===
Most r/Roses false alarms start with normal red new growth. Red, bronze, or burgundy shoots are common on many healthy roses, especially during a fresh flush. If the leaves expand normally, harden, and turn green without clustering, strap-like distortion, abnormal thorniness, bud failure, or spreading cane decline, colour alone is not a strong RRD sign.

Other frequent false alarms include herbicide drift, chilli thrips or mite injury, aphid-distorted tips, heat or drought stress, transplant shock, pruning response, fertiliser burn, spray burn, and vigorous basal breaks. A useful post should say whether weedkiller has been used nearby, whether the growth later turned green, whether multiple shoots are clustered from one point, whether the thorns are unusually dense and soft, and whether buds or flowers are deformed.
	* One cane or section showing abnormal growth that progresses over time.
	* Decline, dieback, or repeated abnormal flushes after growth should have hardened.

=== What to do if RRD is plausible ===	=== What to do if RRD is plausible ===
* Take whole-plant photos plus close-ups of the affected cane, leaves, buds, thorns, and nearby roses.
* Compare symptoms over time; progressive distortion is more concerning than one colourful flush.
	* Take whole-plant photos plus close-ups of the affected cane, leaves, buds, thorns, crown, and nearby roses.
	* Check for [[RRD Look-Alikes]], especially normal red growth, [[Herbicide Injury]], aphids, mites, thrips, and heat or root stress.
* Contact local extension or a plant diagnostic lab when available.	* Contact local extension or a plant diagnostic lab when available.
* If RRD is strongly suspected or confirmed, remove the plant promptly, including as much root material as practical.	* If RRD is strongly suspected or confirmed, remove the plant promptly, including as much root material as practical.
* Bag infected material and dispose of it. Do not compost suspect RRD material.	* Bag infected material and dispose of it. Do not compost suspect RRD material.
* Monitor nearby roses and multiflora rose, which can act as an infection reservoir.	* Monitor nearby roses and multiflora rose, which can act as an infection reservoir.

	=== US and UK/EU notes ===
	* RRD is a major concern in the US and Canada, especially where multiflora rose is present.
	* RHS notes RRV is a problem in the USA and Canada and says suspicious UK cases should be reported to plant health authorities when herbicide injury is not a good explanation.
	* There are no pesticides that cure RRD. Mite control is difficult and is not a substitute for removing infected roses.

=== RRD comparison tool ===	=== RRD comparison tool ===
Use the RRD compare tool from the sidebar to upload suspect photos and view them beside verified RRD reference images. Mods can add reference examples by approving public images and tagging them Verified RRD.	Use the RRD compare tool from the sidebar to upload suspect photos and view them beside verified RRD reference images. Mods can add reference examples by approving public images and tagging them Verified RRD.

	'''Use controls lawfully:''' Current local product label/register wins for any pesticide, fertiliser, or soil amendment use.

=== Sources ===	=== Sources ===
* [University of Maryland Extension: Rose Rosette Disease](https://www.extension.umd.edu/resource/rose-rosette-disease)	* [University of Maryland Extension: Rose Rosette Disease](https://www.extension.umd.edu/resource/rose-rosette-disease)
* [Oklahoma State Extension: Rose Rosette Disease](https://extension.okstate.edu/fact-sheets/rose-rosette-disease)
* [Clemson Extension: Rose Diseases](https://hgic.clemson.edu/factsheet/rose-diseases/)
	* [Oklahoma State Extension: Rose Rosette Disease](https://extension.okstate.edu/fact-sheets/rose-rosette-disease.html)
	* [UC IPM: Roses diseases and abiotic disorders](https://ipm.ucanr.edu/home-and-landscape/roses-diseases-and-abiotic-disorders/)
	* [RHS: Rose problems FAQ](https://www.rhs.org.uk/plants/roses/frequently-asked-questions)

[[Category:RRD]]	[[Category:RRD]]
[[Category:Diseases]]	[[Category:Diseases]]
[[Category:Care]]	[[Category:Care]]