My blackcurrant bushes are coming into bud but there is a strange reddish river looking mark on a couple of the leaves. A fellow plotholder said to spray them with a bug killer, so asked hubby to get me a spray for the blackcurrants when he was in town today and he came back with Py Spray. It's says on the label that it's fine for flowers, fruit and veg, but on the back that it's dangerous for the environment! Can anyone give me advice on this product - or what I should use instead, please?