New host plant records for pospiviroids
Following the recent findings of Potato spindle tuber viroid (Pospiviroid, PSTVd – EPPO A2 List) in ornamental Solanaceae in Europe (e.g. Solanum jasminoides and Brugmansia– see EPPO RS 2006/142, 2006/159, 2006/229, 2007/024, 2007/149), surveys have been initiated in the Netherlands in 2006 to better understand the host status of ornamental plants. Many plant samples have been collected and tested (RT-PCR, sequencing). Although none of the ornamental host plants showed any symptoms, several samples tested positive for the presence of pospiviroids. In all cases, eradication measures have been applied (destruction of infested lots). The following viroids were identified:
- Citrus exocortis viroid (CEVd) in Verbena sp. (Verbenaceae). It is noted that CEVd had also been recently reported on Verbena in India and the USA.
- Potato spindle tuber viroid (PSTVd – EPPO A2 List) in Brugmansia suaveolens, Streptosolen jamesonii, and Solanum jasminoides (all Solanaceae).
- Tomato apical stunt viroid (TASVd – EPPO Alert List) in Cestrum sp. (Solanaceae).
Sources
Singh RP, Dilworth AD, Baranwal VK, Gupta KN (2006) Detection of Citrus exocortis viroid, Iresine viroid, and Tomato chlorotic dwarf viroid in new ornamental host plants in India. Plant Disease 90(11), p 1457.
Verhoeven JTJ, Jansen CCC, Roenhorst JW (2007) First report of pospiviroids infecting ornamentals in the Netherlands: Citrus exocortis viroid in Verbena sp., Potato spindle tuber viroid in Burgmansia suaveloens and Solanum jasminoides, and Tomato apical stunt viroid in Cestrum sp. New Disease Reports Volume 15 (February – July). http://www.bspp.org.uk/ndr/july2007/2007-13.asp
Verhoeven JTJ, Jansen CCC, Roenhorst JW (2007) Streptosolen jamesonii ‘Yellow’, a new host plant of Potato spindle tuber viroid. New Disease Reports Volume 15 (February – July). http://www.bspp.org.uk/ndr/july2007/2007-46.asp