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Orange Rust: Symptoms: Orange powdery growth on the underside of leaf surfaces. Photo by Plant Disease Clinic |
There are many types of rust diseases occuring on raspberries that are caused by different fungi. Orange and yellow rusts are two of the most common types occuring on raspberry. Orange rust on black raspberry is the most serious. Orange rust is systemic, so infected plants will show symptoms each growing season. Yellow rust commonly occurs on red raspberries. |
Orange Rust: Symptoms: Orange powdery growth on the underside of leaf surfaces. Photo by Plant Disease Clinic |
| Causal organism: | Orange rust:Arthuriomyces peckianus & Gymnoconia nitens Yellow rust: Phragmidium rubi-idaei |
| Over wintering: | Orange rust: In infected plant roots Yellow rust: In plant material and debris |
| Months of infection: | May - June |
| Method of dispersal: | Rain and wind |
| Infection point: | Leaves and/or canes, rarely fruit |
| Control: | Choose a proper planting site and control all weeds. Properly water, fertilize, and mulch plants. Clean up all plant debris and thin plants yearly. Orange rust is a systemic disease (spreading to and remaining in all parts of the plant), so affected plants should be removed. |
| Labelled fungicides (First application) |
Lime sulfur as a dormant spray (in spring at bud swell) Yellow rust: Copper (at bud break) See the U of MN Extension's "Home Fruit Spray Guide" for more info on spraying |
| Comments: | Choose hardy, disease resistant varieties when available. |
| For additional info | For additional info | Back to Raspberry Diseases |