Citrus tristeza virus (CTV) is a member of genus Closterovirus with long flexuous virions, approximately 2000 X 11 nm and monopartite genome and is vectored by aphids. CTV spreads into new regions via movement of infected propagating materials and within a citrus growing area by aphid dispersion. Efficiency of CTV transmissibility is affected by the species of aphids, the source plant at acquisition feeding and the CTV isolate. The BrCA is the most efficient aphid vector of CTV. In areas where BrCA is not present, Aphis gossypii is the most efficient vector implicated. In major citrus growing areas of Peninsular Malaysia, all Citrus varieties and its hybrides including Fortunella sp., Citrofortunella microcarpa and Citromelo were infected with CTV in a high rate. Survey of CTV vector (s) in Peninsular Malaysia revealed that at least there is one efficient vector (A. gossypii) of CTV in citrus growing areas.
Key words: Citrus Tristeza virus, Aphids, transmission, Peninsular Malaysia.
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