White spots on roses? If they appear with moisture, most likely it is white, a frequent problem that requires attention: it is believed that mild conditions and air stagnation favor it, but there is hope with effective and natural remedies.
Before immersing yourself in the analysis, observing the plant immediately and acting with small gestures can make the difference: eliminating affected leaves or improving ventilation around the bush can arrest the phenomenon in the bud. The white spots on roses They are never just aesthetic: often you think about the so -called sore whitebut it can also be treated by insect attacks or nutritional problems. It is interesting to note how humidity creates the perfect environment for mushrooms that remain silent until they become visible. It is believed that the heat and the wet night are the highlight for the reproduction of the spores, and it is precisely here that the alarm is activated.
Sooner or later someone notices it: slight white powders on the upper page of the leaves, then the lower face, and finally the shoots. Have you already taken a look in the evening to check if the condition improves with direct sun? Often it is enough to move pruning and the place: only in this way can everything change.
What the white spots on roses causes humidity causes
The main causes revolve around mushrooms and insects. The sore white It is the most common cause: it looks like a whitish patina, similar to flour, which develops on leaves, sprouts and flowers. This mushroom prefers humid environments and moderate temperatures, especially if the air circulates little.
Then there are other managers, such as the downy mildew And similar molds, less frequent but especially present when humidity focuses in the heart of foliage. Some insects can also simulate the appearance of white spots. There cochinealThe acari they aphids They manifest themselves with cerful or cotton protuberances, capable of confusing the less experienced eye.
In general, White powder on newly curled leaves reports white sickness, while Cerful or cotton officers They make you think of insects. If you notice accompaniment of yellow leaves or black spots, it can also be more complex diseases.
Humidity and white sickness: how to prevent white spots
It is important to plan with care, because preventing is better than taking care. A well -abed environment can really make a difference, especially in the most humid months. Even small tricks, such as avoiding evening irrigation, contribute to reducing the risk. It is useful to observe young leaves often: they are the first to show suspicious signals. Some gardeners prefer light preventive treatments already at the end of winter. Finally, the choice of the position of the plant can change the entire fate of flowering:
- Space and circulation – place the roses in ventilated positions, avoiding too close plants that favor the stagnation of air.
- Targeted irrigation – prefer the watering to the base, early in the morning, in order to allow the drying of the leaves.
- Removal of sick leaves – Eliminate weak leaves and sprouts as soon as they appear, throwing them away from the plant.
- Resistant varieties – to plant tolerant or resistant varieties to white, increasingly widespread in nurseries.
- Use of sulfur dust or preventive treatments with organic solutions to be applied during the season at risk.
Natural remedies and targeted treatments to reduce the impact
When the stains appear, you can intervene immediately with:
- Solution of bicarbonate and neem oil: Mix 1 tablespoon of baking soda, a few drops of neutral soap and a few drops of Neem oil in 4 liters of water. Spray evenly every 7–10 days.
- Sulfur or sulphates: organic fungicides such as sulfur powder, excellent if applied in the absence of extreme heat (over 30 ° C).
- Neem oil puro: also valid for mealybugs and mites, it should be sprayed in the late afternoon, when there is no high insolation.
- Potassium bicarbonate: effective alternative to sodium bicarbonate, with a pH less impacting for the leaves.
For insect problems, use insecticide soaps or horticultural oils: they effectively remove the cochineal without damaging the environment. In addition, light pruning that favor light and ventilation help to break the reproductive cycle of mushrooms and stings.
Persistent white sickness? What to do when natural remedies are not enough
If, despite every precaution, the white spots continue to reappear, there are more decisive strategies to field. THE systemic or combined fungicideslike those based on Tebuconazole, Triticonazole or Chlorotalonil, are particularly indicated because they offer more lasting coverage.
It is advisable to follow a cyclical treatment Adjust, from early spring until late summer, repeating it every 10–14 days and especially after each rain. It is also fundamental constant surveillance: The upper leaves and the inside of the bush are often the first points where the infection lurks.
To avoid the development of resistance, thealternation between different fungicideschoosing formulas with different action mechanisms, mixing organic and synthetic products when necessary.
In any case, even when following the most rigorous protocol, it can be used to repeat the treatments for several weeks, because mushroom spores can be persistent, especially if you neglect the cleaning of the surrounding area.
It is worth asking yourself: is you giving enough space, light and ventilation to the roses? Sometimes the best defense is in careful observation and in action with precaution. A tiny change in the microclimate can always eliminate that unpleasant white veil.
Reviewing the arrangement of plants, experimenting with a short suspension of evening irrigation or trying a natural anti-Ooid solution are small steps easy to put into practice.
In doing so, we will soon return to admire the intact roses, with soft petals and shiny leaves, without white spots to ruin their beauty.
Photo © Stock.adobe
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