Low spore levels (1 to 60 spores/day) have been observed at the HAREC site since our last update.

Accumulated degree-days as of May 16 were 442 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 476 (dotted line).