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Dill is said to repel cabbage worms and loopers (the primary pests against brassicas). This group of plants includes kohlrabi, collards, cabbage, and broccoli.
All three of these plants will help keep aphids away (which can be a significant problem for dill). So, if you have aphids in your area, use these three companion crops for protection.
The lacewings and ladybugs attracted by dill plants will help protect asparagus from pests like aphids.