Recently, several of my plants have developed these translucent spots on their leaves:
What is causing this? What should I do?
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I would ignore the spots. I find them regularly, but they don't expand, and it seem not to damage the plants or reduce harvest.
Just check them regularly, and if they take only a small fraction of surface (compared to all other leaves), just ignore them.
On new plants (so with less leaves), I would worry a little bit more, but I have no solution other than than planting more beans and later selecting the better plants.