There is nothing you can do except to pick off the infected leaves and dispose of them. A good way to control spider mite is a strong jet of water on a daily basis. This knocks them off, and they don't like wet conditions. Don't worry about this damage, it looks bad but the potato plant will still grow and be healthy and give a good crop. On fruit trees, curled leaves can indicate aphids.
Ants are also present as they milk the aphids.
The presence of many aphids causes the leaves to curl instead of opening out flat. Soapy water or a strong jet of water with the hose up underneath should knock them off. The hot sun has caused sun scorching on the edges of raspberry leaves. The sun is getting stronger causing more of these problems as time goes on. Shade cloth may be the answer or try a different location that provides more shade.