The transition between different lesions can take a few days,weeks, or up to several years (Döpfer et al., 1997; Berry et al., 2012;Krull et al., 2016). Although very frequent preferably weekly andconsistent scoring events are preferable to avoid missing M-stagetransitions between scoring dates, the short scoring intervals arenot always feasible on farm. Our data sets’ mean scoring inter-vals varied from 1 to 11.25 weeks. We suggest scoring intervalsto be less than or equal to 1 month since greater intervals willincrease the odds that two or more transitions will have taken placebetween evaluations (Berry et al., 2012). On endemically affectedfarms, this is of lesser consequence compared to farms suffering