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Rose

• Mosaic
• Spots
• Line patterns
• Veinbanding
• Mottle

Virus-infected roses may show no symptoms, or different symptoms in different parts of the same plant. Plants can also be infected with more than one virus.

An infection by Prunus necrotic ringspot virus, Apple mosaic virus, or Arabis mosaic virus, either singly or in combination, is usually responsible for rose mosaic disease. Apple mosaic virus and Prunus necrotic ringspot virus are the pathogens we most often find in rose samples.

Rose mosaic symptoms vary greatly, and can include chlorotic line patterns and spots--yellowish or light green because of lost chlorophyll--and mottled patterns. Although some plants may not show obvious symptoms, infected plants are less vigorous and more likely to die in the winter than healthy ones. Both viruses are spread by grafting. Strawberry latent ringspot virus, spread by nematodes in the soil or by propagating infected plants, can cause yellow flecks on leaves or stunted or distorted leaves. Some cultivars may be symptomless.

Tests for Apple mosaic virus and Prunus necrotic ringspot virus are frequently performed as part of large-scale rose screening programs. For best results, first discard plants showing rose mosaic symptoms, then send samples from the plants that appear healthy.

Rose Screen

Other tests available for rose are:

Pathogen	Symbol	Spread by	Test protocol
Arabis Mosaic Virus	ArMV	nematode, mechanical, seed	PCR
Carlavirus group test	Carla	aphid, mechanical	PCR
Luteovirus group test	Luteo	aphid	PCR
Nepovirus group test	Nepo	nematode, mechanical, seed	PCR
Phytoplasmas	Phyto	leafhopper	PCR
Potexvirus group test	Potex	insect, contact, mechanical	PCR
Potyvirus group test	Poty	aphid, mechanical, seed	PCR
Tobamovirus group test	Tobamo	contact, mechanical, seed	PCR

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