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Subject: Chrysanthemum stem necrosis virus (CSNV) on Tomato in Brazil
Date posted: October 02, 2002
Source: EPPO
Reports of Chrysanthemum stem necrosis virus (CSNV) on tomato (Lycopersicon esculentum) in Brazil continue to increase and raise economic concerns. CSNV is a tospovirus transmitted by thrips that has not received much attention since its initial 1995 detections on chrysanthemum (Dendrathema morifolium) in Brazil and chrysanthemum cuttings sent to the Netherlands from Brazil. Glasshouse-grown chrysanthemums are attributed as the source of inoculum for these recent outbreaks on tomato. Chrysanthemums and tomatoes are the only reported natural hosts for CSNV. On chrysanthemum, symptoms closely resemble tomato spotted wilt virus and symptomless infections can occur. Other potential natural hosts include members of the Solanaceae, Cucurbitaceae, and Leguminoseae families. Research in Brazil indicates Frankliniella schultzei and F. occidentalis as the main thrips vectors. Brazil currently has three tospoviruses on tomato and at this time cannot quantify losses from CSNV. ELISA and host differentials are the current detection methods for CSNV.

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