Does the doll repel the aphids or do the aphids like the dill more? Serious question...
Dill, a fragarent herb, is known as a natural insect repellent against aphids, cabbage looper, spider mites and squash bugs.
It is also known to be a 'trap crop' for tomato hornworm, those large green caterpillars that defoliate mature plants.
The hornworms can be more easily identified in the lacey dill folliage, and easily removed, or drowned.
Also, dill attracts certain varieties of butterfly, such as the 'swallow-tail butterfly', so be selective.
Since they are members of the Umbelliferae family, dill will cross-pollinate with carrots; not reccommended.
There are many other herbs that can be planted with vegetable crops:
'companion planting', and 'trap crops' will increase vegetable production, and use natural repellents.