It forms initially yellowish and translucent spots which then extend into large brown areas, with a rather varied symptomatology. The optimal temperatures for development are around 18 ° C with high humidity, close to 100% and wet foliage for at least 3 hours.
It affects all the green parts of the plant, both young vegetation and less herbaceous tissues.
The preventive treatments are copper-based and those performed for scab can be valid, while for the curatives both broad-spectrum fungicides (Dodine) up to triazoles, cupric and Fosetyl aluminum can be used. In the rose, it appears above all in summer, after the first flowering, in hot, muggy places with little ventilation.
Discover our most disease resistant varieties:
Rosai Rampicanti Rambler
H. Noisette
Rosai ad Arbusto - Arbustiva
H. Noisette
Rosai Rampicanti Climber
Arbustiva moderna
Floribunda o Rosai a Mazzi
Rosai ad Arbusto - Arbustiva
Rosai Rampicanti Climber
Rosai ad Arbusto - Arbustiva
H. Multiflora
Rosai Miniatura
Floribunda o Rosai a Mazzi
Grandi Fiori - Ibride di Tea
Rosai Rampicanti Climber
Grandi Fiori - Ibride di Tea
Floribunda o Rosai a Mazzi