Plant viruses are responsible for a significant proportion of crop diseases and are very difficult to combat due to the scarcity of effective countermeasures, placing them among the most important agricultural pathogens. Most emerging infectious diseases of plants are caused by viruses, being emergence provably favored by climate change, increased seasonal weather instability, and conditioned by intensive global trade. Viral diseases can affect food quality as well as reducing yields, yet quality is also affected by measures such as spraying with pesticides to kill off insect vectors. With no doubt, the best strategy for the control of plant viruses consist of the use of crop cultivars or varieties that are genetically resistant. Thus, introgressions of durable resistance to plant viruses into elite cultivars as well as the identification of new sources of resistance are major goals in plant research. About half of the ~200 known virus resistance genes in plants are recessively inherited, suggesting that recessive resistance is more common for viruses than for other plant pathogens. The use of such genes is a very important tool in breeding programs. Based on previous knowledge on recessive resistance to plant viruses generated by the participating teams, we propose the identification of new plant susceptibility factors whose modification would confer recessive virus resistance. We aim at transferring this knowledge to at least three important crop species: barley, tomato and melon.