Syngenta Topas Systemic Fungicide for Plants Powdery Mildew Black Spot Scab Rust
1 | How quickly does Topas stop powdery mildew spread?. No—Topas targets powdery mildews and related ascomycetes. Combine with a phosphonate, copper or QoI for downy mildew cover. 3 | Does Topas move into new leaves?.