Hi, welcome to the forum from Louisiana, glad you joined.
The caterpillars I'd find on dill were usually the larva of the Eastern Black Swallowtail butterfly. That's not it, wrong colors, not sure which butterfly that would make. Since I was growing dill for the heads to make dill pickles and those caterpillars just ate the ferns I left them alone and let them pupate.
first time i've seen them when i was out picking dill right before dark so i could get the pickles made. made for a longer time of the process having to inspect each bit of dill. yes, pests for sure! will have to read up on what they might be when they grow up so i can keep an eye out for...
from Central IL. Please put where you live with your avatar bc I will forget where that is when your starting posting on other threads.
RE; your worm...
The purple carrot-seed caterpillar is green and reddish brown with prominent white spots on each segment of the body. Photo by Shannon Bielicke, Johnson County Extension Office.
If you like digging in the dirt, you will enjoy squishing worms, too.
I know I thoroughly enjoyed squishing the squash vine borer that killed my zucchini.
If you’ve seen a large, mostly black butterfly lately, chances are it was a black swallowtail, a very common butterfly of eastern North America. The colorful caterpillars feed on many herb garden plants while the adults nectar at a variety of flowers. To learn more about this species and how to...
after the one year i think i did have some repeat the following year, but i don't recall them being a major problem the year after and i've not seen any this year at all. i have cut and eaten dill without even looking beyond a quick glance. perhaps they're not there or they don't add enough of an off-taste or texture i've noticed? one thing for sure, i'm not looking too closely in the past year because i'm not making pickles. i guess tiny worms floating around in a pickle jar might upset someone but give them a big worm floating around in alcohol and they won't phase them in the slightest...