Yellow spots on the underside of hop leaves

[howdyho]

Hello!

My first post here, I've been brewing for a year now, but haven't posted yet on this forum so cheers !

I planted Magnum hops last year and had spider mites which destroyed most of the 1st year's yield So this year I decided to be more careful and look for these nasty bugs before they are all over the place. I found this on the underside of bottom leaves 2-3 days ago (Check pics below). Maybe I'm just being paranoid and this is just some random pollen or something else, but in case these are spider mite eggs what should I treat them with?

Also there are kinda dried areas of leaves too, I didn't notice mites yet, but I could have just missed those tiny bastards...

Whole leaf (bottom side) with visible yellow spots:


Part of the leaf with dry spots (bottom side):


Yellow spots under microscope (bottom side again) :


Same as above but top side of the leaf:


One more pic of area affected by yellow spots:


Anyone experienced something similar?
Thanks and cheers!

 

[B-Hoppy]

Those are lupulin glands. They're found all over the plant but are concentrated in the cones of the female plant. Unless you live where it's really hot, mites generally aren't a problem at this time of the year, look up their life cycle.

 

[howdyho]

Indeed they look like lupulin glands, I wasn't aware that they can be found before the cones even appear. Thanks!

Continental climate with hot summers here, I had those bastards last year during peak summer (July/August) so for now, they shouldn't be a problem, but they usually start laying eggs around this time so I panicked.

For future reference, here is mites' life cycle: