Calculation used: match the event average temperature to the closest OMAFRA wetness row, then compare clustered wet hours against the light, moderate, and heavy wetness thresholds from that row.

Use on the page: this is the primary infection severity shown in the event table and summary cards.

Source: OMAFRA relationship of temperature and moisture to apple scab infection

Calculation used: match the event average temperature to the closest secondary infection row, then compare clustered wet hours against the infection-hour threshold for that row.

Use on the page: this is the secondary infection severity shown beside the OMAFRA primary result for each event.

Source: APS apple scab education center and Mills-style infection guidance

Calculation used: accumulate degree-days above 0 C from the configured biofix date, compare that running total to the 760 DD threshold, and describe the maturity stage reached by the end of each event.

Use on the page: this estimates how mature the seasonal ascospore pool is, and how much more of the yearly ascospore supply likely matured since the last completed event.

Source: OSU apple scab model interpretation

Source: Gadoury and MacHardy 1982 ascospore maturity model