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A few of my beet plants (~5%) have these odd skin-like bubbles forming on one or two of their leaves. When I pop them they're filled with these patches of black particles (possibly dead pests of some sort?). Any ideas what they're from, and/or if they're malicious?

I'm in the high desert in Albuquerque, NM where it's been oscillating between intense sun, cool (40s-50sF) nights, and spotty rain. I have had an outbreak of leaf miners on the beet leaves and nearby on some cauliflower and spinach leaves. Could this be related?

Top of the leaf Back of the leaf Top after popping

  • Something similar happened here: Beet Leaves turning yellow brown – J. Chomel Jun 2 '17 at 5:19
  • Yeah I looked through that before posting, but I didn't find any reference to bubbling like this. I'll cut back on the watering a bit (I may be overcompensating for the dry, windy, and sunny conditions) and try the Boron though. – calcium3000 Jun 2 '17 at 15:59
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Could be spinach leaf miners - they're a pest on beets as well. The blisters are caused by the tiny maggots inside the leaf, that's likely what the black bits are that you can see now you've popped a blister.

There's no real solution other than trying to keep them out in the first place by using row covers or something similar - more info here http://www.apartmenttherapy.com/gardening-qa-why-are-my-swiss-153766

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