Pest risk assessment of the Cucumber green mottle

07/207-4 Finaland periods with no production) and the indirect costs due to difficulties in cooperation withother growers and uncertainty regarding the market situation.To avoid all possible pathways of CGMMV infection, some growers may be reluctant to reusetrays for cucumber transport. Increased waste from the cucumber production can thus becomea negative environmental consequence of a possible further establishment and spread ofCGMMV in the PRA area.As CGMMV particles are very stable, it is difficult to get rid of the virus without an efficientwashing and disinfection procedure.Dry heat treatment of seed lots (to 70°C for 2-4 days) has been found highly effective, and hasprobably been the most effective measure to prevent the spread of CGMMV.New cultures must start with healthy seed or healthy seedlings. It is important to limit theamount of visitors, and avoid tools or trays or people coming from potentially infectedgreenhouses.It is important to handle healthy plants before infected ones to avoid spread of the virus to theentire crop. Use of skimmed milk (dipping hands, spraying on leaves) has been found to slowdown the spread of tobamoviruses.In the case of a crop infection, there has to be strict destruction of infected plant material,washing and disinfection of greenhouses, equipment, tools and clothes. To safeguard the newcrop there should be a stop in cucumber production before starting a new cucumber crop.Norwegian Scientific Committee for Food Safety 26