companion planting didn't work

Thats a shame, I have just taken on an allotment and am slightly concerned if my neighbours use chemicals as I dont want the spray getting onto my produce.  I grow organically and use companion planting at home - onions/garlic around carrots seem to work.  I also use net curtains to protect my few cabbages from catapliers.

We are usually overrun with blackfly in our garden, its more of a problem and very prolific than slugs/snails and any other pest - at times I feel like tearing my hair out and give up with shear dispair but then this year my clematis which was covered last year is totally free of blackfly this year.

When I get my crops in next year I am going to buy ladybird lave etc... to help fight the battle of the blackfly!

OVP x

Dare I say this year there is hardly any BB, however we have noticed last night a massive amount of ladybird nymph, I wondering if we are going to get plagued like 76, that was the year ehh!