Rose stem and cane diseases

Dark lesions, cracks, dieback or galls on canes usually mean a fungus or bacterium entered through pruning wounds.

Where is the problem?

Calcium (Ca) deficiency typically develops in acidic soils, leached substrates, or where irrigation is uneven, because…

Crown gall is a bacterial disease caused by Agrobacterium tumefaciens, which forms hard, swollen tumour-like galls at…

Light deficiency occurs when the rose does not receive enough light to photosynthesise efficiently. Roses need at least…

Two closely related piercing-sucking pests commonly attack roses: Mealybugs (Pseudococcidae): soft-bodied insects…

Phosphorus (P) deficiency occurs when the rose is not supplied with enough phosphorus — one of the three macronutrients…

Pestalotiopsis leaf spot and blight is caused by fungi of the family Pestalotiopsidaceae — chiefly Pestalotiopsis and…

Powdery mildew is caused by the fungus Sphaerotheca pannosa (also classified as Podosphaera pannosa). It is one of the…

Rose Rosette Disease (RRD) is one of the most destructive diseases of roses (Rosa spp.), especially across North…

Stem canker is caused by a complex of fungal pathogens including Botryosphaeria, Leptosphaeria, and Coniothyrium…