I do know that dill and other plants like queen anne's lace are loved by lady bugs. Not sure why! It's a great sign that they are around your garden though! :)I know lacewings also love dill, they feed on the nectar (I think).

Rather than assuming that your dill plants have an aphid infestation, why not inspect them so that you know for certain? That way you can take some preventative measures next year.

Well, I did look and really didn't see any aphids. I didn't get out my magnifying glass. But why else would there be so many ladybugs? They have to be eating something there, don't they?

Yesterday I brought in some dill from the garden that appeared to be pest free. I laid it on the white counter before washing and chopping, when I picked it up there were itty-bitty-teeny-weeny aphids all over where the dill had lain. Perhaps that's what your Ladybugs were eating..... no-see-'em Aphids.

It just occured to me - I don't remember any ants on the dill. If there were aphids there, I would think there were be ants too. But then, maybe the ladybugs were eating the ants too?

Also, the ladybugs were all on the mature/dying dill. I had loads of baby dill plants that were about six inches tall. No ladybugs on them at all.

Having aphids in the garden doesn't always mean having farming ants. I only get ants farming aphids when there are ants hills nearby :)