Was wanting to hear other people's experiences? This the second year in a row the flea beetles have used prosper as a salad dressing on my canola. We never had this issue with helix extra and the new expensive lubiderm works very well also.
Doesn't it just depend on how many flea beetles there are? They have to chew/bite the canola plant to ingest the chemical that will kill them. If there are enough flea beetles, there won't be much plant left if they all take a bite.