Potato cultivars that are resistant to late blight and at the same time having acceptable other traits, have started to emerge. However, little of this material is used in Sweden and no organized and comparative table potato trials are done. Biological products against skin-finish diseases are becoming available, and skin-finish as well as drought cause increasing problems for Swedish potato growers. The main goal of this application is to promote the use of resistant cultivars and biopesticides in potato production in Sweden. This will be achieved by screening-trials with a large start material, followed by comparative trials at three different regions with different cultivation systems: conventional, biopesticides and ecological. Traits such as resistance to late blight, drought and skin-finish, as well as yield and size distribution will be analyzed. New types of molecular analyses and communication will also be carried out to ensure diversity of resistance mechanisms.