hello, coming from work and read not all posts-quick answer from my small experiences:
stinging nettle together with fruit trees and bushs against aphids
basil (Basilicum) together with cucumber, cabbage and tomatoes against mildew and white fly
southern wormwood (artemisia abrotanum), rosmary together with cabbage and carot against cabbage butterfly
lavender together with roses against ants
tagetes together with tomatoes, cabbage, botatoes and strawberries against nematodes
horse radish together with cherry and peach against leaf curl. Greetings, ThaiGer