This pest survey card was prepared in the context of the EFSA mandate on plant pest surveillance (M-2020-0114), at the request of the European Commission. Its purpose is to guide the Member States in preparing data and information for chrysanthemum stem necrosis virus (CSNV) surveys.
These are required for designing statistically sound and risk-based pest surveys in line with current international standards. CSNV is a clearly defined taxonomic entity. It is a Union quarantine pest reported in Brazil, Iran, Japan, and South Korea. CSNV has been declared officially eradicated from all Member States in the EU. CSNV systemically infects its host plants and is transmitted naturally by thrips vectors, i.e. Frankliniella occidentalis, F. schultzei, and F. intonsa, which are known to be present in the EU with different prevalences. CSNV has a wide host range including ornamentals and tomato plants. Detection surveys should include chrysanthemum and other ornamental plants, while for delimiting surveys all known host plants should be included. Host plant and vector presence are the only limiting factors for the establishment of the virus. CSNV spreads naturally mainly through its vector thrips. The main pathway for spread is the movement of CSNV in infected plants for planting or plants for planting infested by viruliferous vectors.
CSNV can cause a range of symptoms in its host plants, mostly on leaves and stems, which can be confused with those caused by other tospoviruses. Therefore, visual examination is not sufficient, and identification should be confirmed by sampling and molecular testing.
EFSA (European Food Safety Authority), Mustapic L, Milanovic J, Chiumenti M, Culot A, Carotti L, Mattion G and Vos S, 2024. Pest survey card on chrysanthemum stem necrosis virus. EFSA supporting publication 2024:EN-9108. doi:10.2903/sp.efsa.2024.EN-9108.
Source: EFSA