Q.Who Is Eating My Swiss Chard?
Tha plants are struggling to grow as leaves are eaten

BushDoctor
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on June 3, 2020
It could be any number of insect pests. Unfortunately, it is hard to say which without catching it in the act.
I would treat with a broad spectrum insecticide.
These articles will help:
https://www.gardeningknowhow.com/special/organic/what-are-organic-pesticides.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides
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