Stroby WG is a strobilurin fungicide with excellent protectant activity for control of leaf and fruit scab in apples leading to an increase in the production of quality fruits. When Stroby WG is used for control of apple scab a reduction of apple powdery mildew may also be obtained. Stroby WG also gives protectant activity for control of powdery mildew in strawberries and blackcurrants and mildew and blackspot on roses.