If there are no obvious insects visible in the daytime, slugs and/or earwigs
would be my guess. Go out at night with a flashlight.

Use "Sluggo" for the slugs (safe for pets and people, very effective) and
soap spray or traps for the earwigs.

Cheers,
Sue

--

Zone 6, South-central PA

"Al" wrote in message
link.net...
In our many years of gardening, we have never experienced this problem.
Any idea what is eating away at the beet greens? Solution? Garden
is protected by electric net. Insect? TIA