Pepino mosaic virus
the virus – which isolate of which strain – that causes the infection is one them. The moment in the crop cycle when the infection takes place is another [...] case of infection, the infection is usually more aggressive than when only one single strain is present. Within the strains, however, there is also variability [...] isolates belonging to the same strain. Although different isolates within one and the same strain are genetically very similar, they can show very different