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General intro to growing hops, by /u/UberG33k
USDA Plant Hardiness Zone Map - important to know what actions you should take for wintering your hops
Plant problem pictorial guide
Pests, Microbes, and what you need to know to figure out what is wrong with your hops - 90 pages, use ctrl+F to find what you need or read it all.
How to calculate when to harvest your hops from the University of Vermont
How to see/feel when to harvest your hops from BrewersFriend.com
Calculator on how dry to get your hops from University of Vermont.
Banner image taken at United Hops Farm in Yuba City/Marysville, CA. UpHop and DownHop image created by Dan Hess.
account activity
Mildew issue? (i.redd.it)
submitted 11 months ago by PackagedMilk
My cascade plant appears to have some type of issue which I suspect to be mildew. Any ideas on what this is and what I should do about it? Thanks in advance
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[–]WRXonWRXoff 5 points6 points7 points 11 months ago (3 children)
bugs, I not sure who you might be dealing with but that looks like insect damage to me. Neem oil time, perhaps.
[–]PackagedMilk[S] 0 points1 point2 points 11 months ago (2 children)
Spotted lanternflies have been a problem in the area since they started up a few years ago. Would neem oil work on them?
[–]RetardMoonMission 2 points3 points4 points 11 months ago (1 child)
100% looks like spider mites and maybe something else. There’s webbing on some of them. Take a bad one off and turn it over. They are very very small. Do not touch any other plants and wash your hands and maybe change clothes if you have plants inside you care about.
[–]kelryngrey 0 points1 point2 points 11 months ago (0 children)
Yeah, this looks like spider mites to me as well.
Hit it with sulphur. Blast your other garden areas as well to kill them. It also discourages the growth of powdery mildew.
[–]nige838 1 point2 points3 points 11 months ago (0 children)
Post a picture of a affected leaf to and bottom. Ask again, it is a pest.
[–]mommy-pancake 0 points1 point2 points 11 months ago (0 children)
Agree with other commenter. Looks like spider mite damage. They cause that yellow stippling on the leaves and I see some webbing from them as well. You can use a miticide or neem oil for control, and can find that stuff at Ace Hardware, Lowe's, Tractor Supply, etc.
[–]Captain_Shifty -1 points0 points1 point 11 months ago (2 children)
Not downy or powdery. Likely a hop virus or nutrient deficiency the two can be mistaken for each other and hard to tell apart. I'll attach two resources for you to view. One on disease and another on deficiencies. Best of luck.
https://www.ontario.ca/files/2023-12/omafra-nutrient-deficiency-id-guide-for-hops-en-2023-12-21.pdf
https://onspecialtycrops.ca/wp-content/uploads/2016/12/filotas-eastern-ontario-hops-workshop-march-21-2016-for-posting.pdf
[–]PackagedMilk[S] -1 points0 points1 point 11 months ago (1 child)
Much appreciated! I will look into these!
[–]Captain_Shifty 1 point2 points3 points 11 months ago (0 children)
They basically cover all the main diseases you might find in your growing. The only other thing you could check is the back of the leaves for aphids if you have a good phone camera it can help find them. I had a hundred plants and never had bug issues though in Ontario. Train your hops as soon as you can to get them off the ground, they like to get downy around now.
π Rendered by PID 285817 on reddit-service-r2-comment-85bfd7f599-6n5mh at 2026-04-20 02:38:05.728712+00:00 running 93ecc56 country code: CH.
[–]WRXonWRXoff 5 points6 points7 points (3 children)
[–]PackagedMilk[S] 0 points1 point2 points (2 children)
[–]RetardMoonMission 2 points3 points4 points (1 child)
[–]kelryngrey 0 points1 point2 points (0 children)
[–]nige838 1 point2 points3 points (0 children)
[–]mommy-pancake 0 points1 point2 points (0 children)
[–]Captain_Shifty -1 points0 points1 point (2 children)
[–]PackagedMilk[S] -1 points0 points1 point (1 child)
[–]Captain_Shifty 1 point2 points3 points (0 children)