Rose flower and bud diseases

Rotting buds, brown-spotted petals, deformed blooms or early bud drop can come from fungi, insects or the weather.

Where is the problem?

Aphids (family Aphididae — the common pest species on roses is Aphis gossypii) are soft-bodied insects, approximately…

Botrytis blight (grey mould) is caused by the fungus Botrytis cinerea. It attacks flowers, buds, and young shoots most…

Iron (Fe) deficiency is usually caused by alkaline soil (pH > 7), which precipitates iron into forms the roots cannot…

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…

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

Rose mosaic is caused by a complex of plant viruses, most often Prunus necrotic ringspot virus (PNRSV) and Apple mosaic…

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

Sulfur (S) is often called the fourth major nutrient for roses, after nitrogen, phosphorus and potassium. It is a…

Thrips are tiny (1–2 mm) piercing-sucking insects in the order Thysanoptera, most commonly Frankliniella occidentalis…