Posted: 14/07/2013 at 10:05
My allotment neighbour waters the leaves of his brassicas with extract of rhubarb leaves - fill an old dustbin with rhubarb leaves, top up with water and leave for a few weeks. Smells as bad as you would imagine, keep the lid on! Water over the plants generously. I must say his brassicas look healthy and completely un-pecked. Also deters catapillars I am told. I haven't tried it because I know rhubarb leaves are poisonous which makes me nervous about applying it to an edible crop.