Out of seven hop varieties planted this Spring two have died in the last three weeks, and one seems to be struggling. First the leaves turn yellow/brown, then an entire bine dries out within 3-4 days. Here are the pictures:
Varieties that died are Ultra and Liberty. Also, Mt. Hood is struggling. I have a downy mildew problem with my grapes that are growing nearby. But the underside of hops leaves doesn't have those white spots.
Any ideas? Thanks.