Lower Columbia Basin: Burkard spore trap in artificially-infested perennial ryegrass fungicide test plots at the Hermiston Agricultural Research and Extension Center. Spore production is continuing at this site. On May 26, over 27,000 spores were detected:
Upper Columbia Basin: Burkard spore trap and rotating arm sampler in a Kentucky bluegrass seed field near Paterson, WA (naturally occurring inoculum). Spore production is continuing at this site:
Central Oregon: Burkard spore trap in Kentucky bluegrass plant growth regulator test plots at the Central Oregon Agricultural Research and Extension Center (naturally occurring inoculum). Spore production is continuing at this site:
Union County: Rotating arm samplers placed in two Kentucky bluegrass seed fields with moderate and high histories of ergot (naturally occurring inoculum). Over 2,700 spores were detected during the week of May 19-May 26 at Field #1. Spores have not been detected at Field #2.
Many fields are in full flower (anthesis). Protective fungicides should be applied immediately prior to onset of anthesis and throughout the flowering period to protect unfertilized ovaries from infection. Cultivars with prolonged flowering periods may require more than one application.
Please refer to the PNW Plant Disease Management Handbook for more information on fungicide options for ergot (https://pnwhandbooks.org/plantdisease/host-disease/grass-seed-ergot), or contact Jeremiah Dung if you have any questions.
This work is funded by the Eastern Oregon Kentucky Bluegrass Working Group, the Washington Turfgrass Seed Commission, the Oregon Seed Council, and the Agricultural Research Foundation.