Some bugs just like certain plants. In my greenhouse of about 25 plants Ive got 3-4 that ants just won’t fuck off of, got em to abandon a couple but won’t give it a rest on the other couple
If u wanna do something without throwing anything on the plant then get 4 sticks on four sides of ur grow container and pitch a tent with some mesh screen over top of it at night when it’s being unattended