Information, including identification, symptoms and control, related to most common diseases that plague rose growers in Western Missouri and Eastern Kansas.
Cleanliness is the best method of reducing problems that can arise once roses are established. Always remove prunings, leaf litter and faded flowers; use clean mulch; keep beds free of weeds; and, of utmost importance, use clean pruning equipment to reduce transmission of disease.
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Select Below to Learn More About
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Crown Gall Description:
Symptoms:
Control:
Reference: U. of Minnesota, Crown Gall |
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Fungal |
Black Spot
Description:
Symptoms:
Control:
Reference: K-State Extension, Rose Black Spot PDF |
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Cankers
Description:
Symptoms:
Control:
Reference: U. of Maryland Extension, Rose Cankers |
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Powdery Mildew
Description:
Symptoms:
Control:
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Viral |
Rose Mosaic
Description:
Symptoms:
Control:
Reference: |
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Rose Rosette
Description:
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Symptoms:
Control:
Reference:
- Elongated, reddish new growth that stays red. It is not unusual to see reddish new growth, but normal growth typically turns green as it matures.
- Excessive prickles, usually smaller than normal, appear on the canes.
- Leaves are chlorotic, deformed, narrow, and/or small.
- Flower buds don’t open normally.
- Blooms are deformed.
- New, infected canes are larger than the cane from which they arise.
- Multiple branches on the end of canes form the characteristic ‘witches broom’ growth.
- Many of these changes mimic herbicide damage, so a detailed history and careful examination of surrounding plants is necessary to eliminate herbicide drift as a cause of unusual growth among roses.
Control:
- No effective treatment for RRD virus infected roses.
- Infected plants should be removed and discarded in the trash, as soon as, RRD is diagnosed.
- New or replacement roses can be planted in the same spot after waiting a week.
Reference: