Pepino mosaic virus
takes place when the plants are heavily laden. Typical of the damage caused by PepMV is, that it is very intense for a few weeks and then disappears to [...] employees, visitors, mobile phones, insects, etc. In other words, all means by which plant sap of an infected plant gets in contact with a non-infected plant [...] plant. As soon as one single plant in the greenhouse has been infected by the virus, it is impossible to protect the other greenhouse plants from infection