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The properties that are important for starch varieties are highly varied. The main ones are resistance to different types of wart disease and potato fatigue (potato cyst nematodes), starch content, protein content and yield.
Resistance to Phytophthora infestans is becoming more important, since this makes it possible to greatly reduce the use of pesticides (50-75%) and achieve considerable cost savings. The resistance levels of clones in the programme are determined by infecting them with the pathogens in bioassays and examining the extent to which they are affected.
Aspects such as the number of tubers, shape and virus sensitivity are determined because the seed potato grower must also be able to grow the potential variety cost-effectively. And there are many other aspects that determine whether an offspring is selected as a potential breed.