For crop problems being eaten as soon as planting,you can purchase a fairy new product called Grazers Originally produced for agricultural use is now being supplied in small bottles for garden and allotment use at £13.99 a bottle+postage
I have tried it on a few Kale i have just planted.A few pecks from the F.R. and they have been left alone for the last few days
A friend who used it last year swears by it after his crop of brassicas was devastated the previour year introduced me to it
http://www.grazers.co.uk/
You're advertising this stuff all over the site.
Sorry, Thought i was being helpfull