Plant diseases

Powdery mildew rose

Powdery mildew

Powdery mildew is one of the diseases that most often endanger the life and health of roses: the development of the disease presents obvious and easily recognizable symptoms. The affected leaves and branches in fact have spots composed of a whitish mold, which tend to expand until they completely cover the leaf or branch. At the same time, they cause its rot and its progressive death. The infection is also evident on the buds, which do not open or they do so giving life to very small flowers, while on the flowers that have already blossomed the spots will appear that will cause a premature fall. The disease is transmitted through conidia which are carried by the wind and which easily take root on healthy tissues,

Treatment and prevention


The prevention of powdery mildew occurs mainly in the agronomic field, with the implementation of behaviors that facilitate the correct and healthy development of the plant without resorting, when not necessary, to the use of products that can also be aggressive for the vegetation. It is important to remove the fallen leaves and twigs, which could give rise to the spread of a disturbance perhaps initially localized, also avoiding water stagnation which also favor the development of fungi and parasites. Pruning is also an important disease-fighting tool, as it promotes air circulation between the leaves and healthier growth for the affected plants. Likewise, a nitrogen fertilizer will be useful for the growth of roses,

Powdery mildew rose: Chemical interventions


If preventive and agronomic measures are not sufficient and the disease manifests itself, it will be necessary to intervene through a targeted and specific chemical fight. In this case, specific products based on sulfur and triazoles or primidyls will be used. The use of chemical agents will probably have to take place several times before the disorder can be eradicated. Using chemicals can also be useful in the preventive phase, with treatments to be applied at the beginning of spring and repeated after some time during the most fertile season of the plant, which also correspond to the periods of greatest risk of the spread of powdery mildew. . It is advisable to resort to treatments in the early evening,

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