I'm in my third year for some plants and 2nd year for about half the
plants, this year the challenge might not be critters but mildew.
Centennnial was the first to surpass the 18+ foot height yesterday
with many more to follow soon. I have chinook, centennial,
columbus, cascade, northern brewer, willamette, nugget.
Overall most of my plants seem to be doing well except I am noticing
some black spots on the underside of leaves (mostly near the bottom
still) and I pick these off. I have thinned most of the bottom leaves
and notice they seem to be the most affected. The pic shows
what the black looks like at the start, it will progress throught the
whole leaf. The second to last picture shows the top of the bine which is
about 11 feet tall and may be infected, I pulled a lot of blackend
leaves off this (columbus) and it also had a bine which was different
light shades of green and I clipped that bine completely off it.
The last pic shows a some sidearm that never started and seem
to dry out and I noticed some black there as well.
I am wondering if this is the downy mildew and what I should be do?
I sprayed with some copper fungicide a couple week ago. But I am not sure what the treatment might be and how to keep this from spreading across the yard?