Originally Posted by Seabee John
most definitely over watered/ overly wet soil... I've got 20 bines with the lower 1/4 looking just the same.... just on a larger scale.... don't water so often... the upper 3/4 of mine now look great.... they will come back just let the soil dry out a bit before you water them again.... I'm down to watering once every 12 days or so and the soil here is a heavy clay so it retains a bit of the moisture.
As John noted, overwatering will cause the leaves to go yellow. I have some hops in a pasture that gets flood irrigation once a week. I have some others that are watered with soaker hoses - 30 minutes twice a week now and I will increase it to 60 minutes twice a week when it gets hot. If you water heavily and water less often, the roots will go deeper in search of water. The plants get more drought resistant as well. And you minimize the possibility of mildew because the top layer of soil does not stay wet.
"You can't drink all day if you don't start in the morning."
Kegged - Where's Waldo Amber Ale
Dry peppering - Jalapeno Wheat
On the fruit - Currant Wheat and Huckleberry Wheat
Primary - FUBAR Weizenbock and Accidental Dunkelweizen
Hops - Centennial, Nugget, Mt. Hood, Cascade, Willamette, Magnum, Chinook