[digital_biscuit]

i did this last year, added rhubarb leaves to my water butt and left to rot! The water stinks but i had no problems with cabbage whites. Didnt try on white fly though! May give it a go this year?

Unfortunately i am moving my water butts soon and the rhubarb one is full of stinky water!!!! Oh dear!!!

[Stevens706]

I have never done this but I seem to remember reading that you boil the leaves then use the cooking water as shown  below

•   Boil 500 g (2 cups) of rhubarb leaves in 1 litre of water for 30 minutes.
•   Let cool and strain.
•   Useful against aphids, leaf miners and spider mites.

Taken from the following website for alternative to insecticides.

http://www2.ville.montreal.qc.ca/jardin/en/info_verte/fiches/pesticides_nat.htm

[SkipRat]

I use Rhubarb in water barrels (rhubarb tea) to help deter cabbage white butterfly,s laying eggs on my brassica,s, seems to work.

[yummy]

Our neighbour gave us some of this yesterday. She said it would kill what was on the brassicas now but wouldn't stop the white fly coming back. My 9 million cavolo nero seedlings were fine on Monday but I went to continue thinning yesterday afternoon and got swarmed with white fly.