Updated spore counts for Central Oregon are shown below:

Stripe rust has also been observed in experimental plots at COAREC, so scouting for this disease is recommended. There are many fungicide options available for stripe rust control – for more information please refer to the Pacific Northwest Plant Disease Management Handbook: https://pnwhandbooks.org/plantdisease/host-disease/grass-seed-stripe-rust

Updated spore counts for Central Oregon are shown below:

Honeydew has been reported in Central Oregon.

Weather conditions in Central Oregon are expected to be favorable for spore production over the next week, and some Kentucky bluegrass cultivars are flowering in the area. Protective fungicides should be applied prior to onset of flowering and throughout anthesis to protect unfertilized ovaries from infection. Cultivars with prolonged flowering periods may require more than one application.

A predictive model for ergot ascospores was developed for the Lower Columbia Basin of Oregon that uses accumulated degree-days (beginning January 1, with a base temperature of 50°F and upper threshold temperature of 77°F) to forecast when ascospores are likely to be present.

According to the model, most ascospores are produced in the Lower Columbia Basin when accumulated degree-days are between 414 and 727. Based on this model, the degree-day threshold was reached on May 27, 2022 in Hermiston, OR (accumulated degree days = 422).

At this time in 2021, accumulated degree-days were 646.