What’s eating our redcurrants? Update #2

I had a great conversation with another vegetable grower the other week, over a game of bowls. I mentioned my sawfly/redcurrant problem (see this post), and she gave me the following tip: horse manure. Stick a layer of horse manure over the soil (in early spring, I think she said), and the sawfly larvae will have a much harder job to emerge and plunder your redcurrant bushes. Something to think about.