Hello, first, it is important to note that there are a few different viruses that infect blueberries in Oregon, the two primary ones are blueberry scorch virus (Vaccinium corymbosum) and blueberry shock virus (Vaccinium corymbosum). Symptoms of blueberry shock virus (BlShV) are very similar to those of scorch virus (BlScV), they both cause sudden flower and leaf necrosis during bloom. However, with BlShV, a second flush of foliage will appear and the plants will look normal later in the season except for the lack of fruit. Laboratory testing is often required to properly diagnose the issue. You can send some photos of symptoms in the reply, or send a plant sample to the OSU Plant Clinic in Corvallis for laboratory testing.

The easiest and best thing to do would be to remove and destroy plants that show symptoms to prevent spread to the healthy plants. If you replant, make sure you are purchasing certified virus tested planting stock. Try to keep the plants healthy through proper soil pH, fertilization, and watering. Other than removal of infected plants, there are no chemical control options, so you will need to let the virus run its course.

For more information, please refer to the following OSU websites:

PNW Handbook: https://pnwhandbooks.org/plantdisease/host-disease/blueberry-vaccinium-corymbosum-shock

Managing blueberry viruses: https://extension.oregonstate.edu/crop-production/berries/managing-blueberry-viruses-pacific-northwest

Virus disease progress of Blueberry Shock: https://extension.oregonstate.edu/video/viral-disease-progress-blueberry-shock