PM 3/24 (2)Chrysanthemum stunt viroid:inspection

Abstract

EPPO BulletinVolume 43, Issue 3 p. 396-396 Phytosanitary procedures Méthodes phytosanitairesFree Access PM 3/24 (2) Chrysanthemum stunt viroid: inspection First published: 19 November 2013 https://doi.org/10.1111/epp.12072Citations: 1AboutSectionsPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Specific scope This standard describes the inspection for Chrysanthemum stunt viroid. Specific approval and amendment First approved in September 1988. Edited as EPPO Standard in 1998. Revised in 2013-09. Introduction Chrysanthemum stunt viroid is on the EPPO A2 List of pests recommended for regulation and details about its biology, distribution and economic importance can be found in EPPO Datasheet (EPPO/CABI, 1997). Phytosanitary measures at import may include provisions that countries exporting plants of chrysanthemum certify either that they are derived, at not more than the third generation, from mother plants which have been tested and found free from the viroid, or that they are directly derived from mother plants of which a representative sample has been inspected visually at flowering. Methods To obtain satisfactory results by visual inspection, it is necessary to examine at least 10% of the mother plants because of the high proportion of symptomless carriers (30%) in some cultivars. It may be difficult to diagnose accurately in cases when a mild strain affects a high percentage of a batch and there are no distinct differences between healthy and affected plants. However, even with these strains, expression is not uniform and inspection will show some variation in growth. It is desirable, if such a situation is suspected, to make a confirmatory laboratory or glasshouse test. Visual inspection A representative sample of 30 plants or 10% of the mother plants whichever is the greater, should be inspected at flowering. In infected plants the flowers are smaller and fewer and, in fact, infected plants bloom earlier, between a few days and several weeks, than healthy plants. The flower colour may be somewhat lighter (see photos in PQR EPPO, 2013). Laboratory testing For laboratory testing see PM 7/6 Diagnostic Protocol for Chrysanthemum stunt viroid. References EPPO (2013) PQR-EPPO database on quarantine pests (available online) http://www.eppo.int/DATABASES/pqr/pqr.htm. EPPO/CABI. (1997) Chrysanthemum stunt viroid. In: Quarantine Pests for Europe, 2nd edn, (Eds Smith IM, McNamara DG, Scott PR, Holderness M) pp. 1227– 1230. CAB International, Wallingford (GB). Citing Literature Volume43, Issue3December 2013Pages 396-396 ReferencesRelatedInformation