Bt won't work on sawflies, as they are NOT the caterpillars of moths or butterflies. These insects can also be expected on currants, but they much prefer gooseberry. Keep you eyes out. Other products you can try would be insecticidal soap, a commercial product rather than home-brewed. Also, neem can be very helpful in controlling this pesky insect. And don't forget strong sprays of water right from the garden hose.

Thanks for the suggestions guys... I went out to check on the plant/caterpillar again and it's gone. I don't know if it may have burrowed into the pot or if it got eaten by something-- I put a sort of "cage" over the pot because something kept digging up the dill so I think the caterpillar would have been fairly well protected from being eaten, but who knows... The plant isn't doing too well unfortunately either :P I am wary of planting dill in the actual garden because I've heard it spreads like crazy, which is why I went with a pot. Maybe next time I'll just get a whole bunch of pots and that way maybe some dill will survive! I think this is the 3rd or 4th planting I've done in that pot this season-- the first one, something dug the seeds up, and the next time something dug the young plants up...something out there really likes dill! I actually tried to plant a butterfly garden in the back of my yard from a "butterfly garden roll" (a roll that supposedly had seeds for a bunch of plants) but it never sprouted. I tried again with a butterfly garden mix that came in a shaker can, but only a few plants came up...

I rescue any and all Cats

If you already know you have a serious slug problem then the odds greatly favor that it is them doing the damage. But without a photo of the damage that is just a guess. There are commercial slug baits available that are quite effective - far more so than any 'home remedies' like beer. Sluggo is one brand name. Sure other pests are possible, rabbits is one of them. But only someone there, checking the garden frequently has a chance to definitely ID the culprit. If it is rabbits then fencing the garden is the only really effective control. Dave