Davo wrote:
Although they are supposed to be poisonous, the leaves on my rhubarb
plants are being regularly eaten back to the stem.
There does not appear to be any caterpillars or snails on them, which
would have been my guess.
Any thoughts as to what the culprits might be?

Davo

Go out at night with a light and check. I have had snails and grubs on
mine. The treatment is different.

David