How do I select the best "strain" of an apple cultivar?

In selecting the best strain of a cultivar it is important to talk to other fruit growers, cooperative extension personnel and nursery owners. Solicit advice from these groups that know your local growing conditions. Check to see if any of these people have trees of the strain you are interested in and visit their orchards to see fruit on the trees. If you are looking to plant large acreage of a particular strain you should set out a few trees, 5 to 10, of the strain in your orchard on a dwarfing rootstock to see how they perform.