One of the key traits for a successful potato cultivar is to have a low incidence of internal defects. To score this trait, the breeding program cuts open 30-50 tubers per plot during our initial post-harvest evaluation.
The photo below on the left shows the presence of hollow heart defect in a plot of Russet Burbank potatoes. The internal quality of the UW breeding line W9133-1rus on the right looks better.
