I have a centennial (2nd year) and a mystery hop (also 2nd year) with what look to be similar problems.
The mystery hop (lighter color plant in the photos) is significantly worse, and had more down-curling leaves. The affected leaves get significantly lighter, then curl down, get crunchy and fall off. this started at the bottom and is working its way up.
the Centennial has some up-turning leaves, and some curling down. These start by turning yellow and brown around the edges and veins, eventually spreading to the whole leaf, which then falls off. It has started putting out new growth at the bottom. also started at the bottom and worked up.
It was cool and wet here until last week. they got some organic fertilizer (don't remember the variety, but it was one i saw recommended on here a while back) at the beginning of the season, and are sprayed regularly with neem (in the evening after the sun has gone down, with the prescribed ratio)
Mystery
Centennial
The mystery hop (lighter color plant in the photos) is significantly worse, and had more down-curling leaves. The affected leaves get significantly lighter, then curl down, get crunchy and fall off. this started at the bottom and is working its way up.
the Centennial has some up-turning leaves, and some curling down. These start by turning yellow and brown around the edges and veins, eventually spreading to the whole leaf, which then falls off. It has started putting out new growth at the bottom. also started at the bottom and worked up.
It was cool and wet here until last week. they got some organic fertilizer (don't remember the variety, but it was one i saw recommended on here a while back) at the beginning of the season, and are sprayed regularly with neem (in the evening after the sun has gone down, with the prescribed ratio)
Mystery
Centennial