Signs on a pest on Calla Aethiopica

Vancouver, Canada

I was hoping to get some help in identifying which pest may be causing this damage. It seems to be windowing, but it also resembles a burn. These are being grown in a high humidity greenhouse, between 15 - 22 degrees celsius.

Thumbnail by wstbch Thumbnail by wstbch
Minot, ND

This looks to me more like environmental stress damage of some sort as opposed to insect feeding damage...

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