Chrysanthemum stunt viroid
Chrysanthemum stunt viroid | |
---|---|
Error creating thumbnail: Unable to save thumbnail to destination
|
|
The flower on the right has been infected with CSVd | |
Scientific Classification | |
Family: | Pospiviroidae |
Genus: | Pospiviroid |
Species: | Chrysanthemum stunt viroid |
Error creating thumbnail: Unable to save thumbnail to destination |
|
Areas where CSVd has been confirmed (blue) and is unconfirmed or has not become established (light blue). | |
Synonyms | |
Chrysanthemum stunt mottle virus Chrysanthemum stunt viroid |
The main hosts of chrysanthemum stunt viroid are chrysanthemum and related ornamentals including Tanacetum. Susceptibility varies between cultivars, but generally all-the-year-round cultivars are more susceptible.[1]
Symptoms[edit | edit source]
Chrysanthemum[edit | edit source]
About 30% of plants are symptomless carriers. Infected plants bloom earlier than normal plants of the same cultivar and this effect increases with time; on plants coming from infected mother plants, it is usually shorter in the first year of infection (a few days) than in the following year (up to more than 3 weeks). Flowers are fewer and smaller and the colour, particularly of the bronze and red ones, may be bleached to a lighter shade. Plants infected the previous summer produce far fewer laterals the following spring.[1]
Leaves are reduced in number and size; a striking crinkle symptom is found in cultivars Blanche and Yellow Garza, the leaf surface being wavy or crumpled with associated yellowish-green patches. Stems become very brittle and break easily where they branch.[1]
Tanacetum[edit | edit source]
Tanacetum parthenium cv. Matricaria Golden Ball may show a dwarfing with associated pale leaves and shortened, crowded inflorescences.[1]
Control[edit | edit source]
Control of the disease is extremely difficult due to its highly contagious nature and long latent period. Viroid-free plants may be obtained by meristem-tip culture, which may be combined with heat treatment. However, the proportion of viroid-free plants which can be obtained is only about 5%.[2][1]
References[edit | edit source]
- ↑ a b c d e Data Sheets on Quarantine Pests - Chrysanthemum stunt viroid. European and Mediterranean Plant Protection Organization. Retrieved: 2011-01-30.
- ↑ Hollings, M.; Stone, O.M. (1970) Attempts to eliminate chrysanthemum stunt from chrysanthemum by meristem-tip culture after heat treatment. Annals of Applied Biology 65, 311-315.