Maybe you really do have fruit fly problems, I don't know. That is the same way to prevent knats. Never heard of anyone having a problem with fruit flys on weed. If so, I learned something.
msactech1 Reviewed by msactech1 on . Getting rid of fruit flies Hi all, although fruit flies are no harm to the plant, I thought I'd share what worked best to eliminate those little buggers. Fruit flies or vinegar flies are attracted by fruit, vinegar, wine, beer (obviously, eh). To get rid of many/most of them, do the following: Take a long drink glass and pour in the following liquids: - Red wine (1/4 of the glass) - Vinegar (half of the amount of red wine) Rating: 5