Low spore counts (between 0 and 10 spores) have been observed on most days, with the exception of May 15 when 212 spores were captured.

Accumulated degree-days as of May 23 were 513 in Hermiston, OR (solid line). According to the model, most ascospores are produced in the Lower Columbia Basin when accumulated degree-days are between 414 and 727.

At this time in 2018, accumulated degree-days were 596 (dotted line).