Pest risk assessment of the Cucumber green mottle

07/207-4 FinalJapanese cucumber strain has been described from Japan. This strain gives severe fruitsymptoms in cucumber and local lesions in D. stramonium, but no local lesions in C.amaranticolor. This strain is now classified as a separate species, KGMMV.The formerly described Yodo strain gives severe fruit symptoms in cucumber and locallesions in C. amaranticolor, D. stramonium and P. x hybrida. This strain is now classified asKGMMV-Y (Francki et al. 1986).The “Indian strain” was isolated from bottlegourd(Lagenaria siceraria) in India (Hollings et al. 1975), in which it caused mosaic, growthreduction and yield loss. This isolate is reported to give local lesions in C. amaranticolor,symptomless infection in inoculated leaves of D. stramonium and no infection in tobacco orP. x hybrida.Of the 22 definitive members in the genus Tobamovirus, four have been identified in Norway(Blystad and Munthe 1997):• Cucumber green mottle mosaic virus (agurkgrønnmosaikkvirus) in cucumber• Ribgrass mosaic virus (smalkjempemosaikkvirus) in Plantago major• Tobacco mosaic virus (tobakkmosaikkvirus) in petunia• Tomato mosaic virus (tomatmosaikkvirus) in tomato4.1.1.5 Bayer computer codeCGMMV4.1.2 Methods for detection and identification4.1.2.1 Symptoms in cucumberTypical symptoms of CGMMV such as mosaic, leaf bubbling, wilting and chlorosis are easilyrecognized, but symptoms on lower leaves and weak symptoms may look like physiologicaldisorders.Norwegian Scientific Committee for Food Safety 8