White, powdery fungal growth on the upper leaf surface, sometimes over the entire plant. It can affect a wide range of plants including some fruit bushes such as currants and raspberries. Leaves can become distorted especially if the foliage is young at the time of infection. Affected fruits may crack and split as they can not expand normally.
Product solution: Spray with Systhane Fungus Fighter before damage is visible and then every 14 days if necessary.