Spore production appears to be ramping up in the Lower Columbia Basin of Oregon:

Accumulated degree-days as of May 20 were 539 in Hermiston, OR (orange 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 2019, accumulated degree-days were 482 (dotted line).

This research is funded by the Washington Turfgrass Seed Commission, the Oregon Seed Council, the Eastern Oregon Kentucky Bluegrass Working Group, and the Oregon Department of Agriculture Alternatives for Field Burning Research Financial Assistance Program.

Updated spore counts are available for the central Oregon area:

  • It is recommended that growers scout fields as grass seed crops approach anthesis.
  • Protective fungicides should be applied prior to the onset of anthesis to protect unfertilized flowers from infection.
  • Cultivars with prolonged flowering periods may require multiple applications.
  • Please refer to the PNW Plant Disease Management Handbook for more information (https://pnwhandbooks.org/plantdisease/host-disease/grass-seed-ergot).

This research is funded by the Washington Turfgrass Seed Commission, the Oregon Seed Council, the Eastern Oregon Kentucky Bluegrass Working Group, and the Oregon Department of Agriculture Alternatives for Field Burning Research Financial Assistance Program.