I am growing Horseradish in a very large tub, what I would like to know is, if I get rid of the horseradish completely can I grow anything else in that soil or will the horseradish keep trying to grow.

it's about 10 - 15mm long, someone suggested it might be a fly maggot?

My autumn fruiting raspberries have curled and deformed leaves which seem to contain an insect.What is this and can I treat it and will it harm the raspberries