I have a tomato plant on my balcony that is suffering due to whitefly. I spray the plant with folimat whenever I see them, which mean every couple of weeks for the las five months or so, but the seem to keep re-appearing.

Any idea how I can knock this thing on the head once and for all?

Thank you :)

Yesterday I build a big trolley/rack on wheels for my tomato plants so that I can roll the plants into the sun when ever I want. I used plain pine timber which I gave a western cedar color and a protective coat of clear varnish.
while the varnish was still wet I put the plants on the trolley and tied them up on the 2.4 meter high support system I build on to the trolley. an hour later I came back to check on it all and to my surprise I noticed that my cedar color had turned white in many spots. On closer inspection I saw that it was whiteflies. again literally hundreds upon hundreds of the suckers had flown from the plants onto the wet varnish and got stuck on it.
The varnish I used is slow drying and this morning I looked again and found lost more whitefly stuck on the wet varnish. absolutely fantastic.
I shook the plants a few times and noticed that the amount of whitefly on my plants had reduced drastically, and while the whitefly still free flew off the plants many of them were stupid enough to land on the wet varnish and joined their already dead family members.
I now shake the plants 2-3 times a day and each time more and more of the suckers will die, beautiful.
I also took the advice I read on some websites and cut strips of yellow dividers (from arch lever file folders) and covered them in petroleum jelly and hung about 10 of these between my 10 plants, that seems to work as well.

so I hope that this will help some of ya's in the worldwide battle against the little white tomato thieves.