I did want you to know right away that we did get a positive identification for Downy Mildew on the variety, Galena. You should be scouting your hop yards several times a week and reviewing what Downy Mildew looks like.
Sue Colucci, extension agent and pathologist in our area, did a good blog piece (with great pictures and control recommendations) on Downy Mildew on hops that you can access here: Downy Mildew on Hops in Western NC.
If you suspect that you have Downy Mildew, sent a sample (use an overnight service and do not send on Friday) to the NCSU Plant Disease and Insect Clinic. I encourage you to report your findings on the Southern Appalachian Hops Guild blog. I'm of the opinion that the more we share information on our hops growing experiences, the faster we will find solutions to our challenges and grow this industry.