Hello. The laurel cherries seem to be affected by a combination of biotic and abiotic factors, such as the stress suffered at planting, inadequate soil properties, lack of balanced fertilization, high and constant humidity of the soil, the presence of pathogens, etc., depending on the case. Some symptoms are similar to those produced by various plant pathogens, possibly bacteria or fungi (for an exact identification laboratory tests are necessary).
For the time being, it is recommended to remove the deteriorated leaves and destroy them by burning, followed by two treatments at an interval of 7-10 days between them, alternating a copper-containing fungicide (e.g. , in a dose of 20 g/10 L water) with an azoxystrobin-containing fungicide (e.g. , in a dose of 10 ml/10 L water). Dissolve in water at the recommended dose and apply by foliar spraying as evenly as possible over the entire plant, while respecting the good practices for carrying out phytosanitary treatments – Phytosanitary treatments - environmental and labor protection. More specifically, if the first treatment is carried out with , after 7-10 days apply . Spray the solutions as finely as possible, so as to achieve a more uniform distribution on the plants, both on the underside and topside of the leaves and on the stems.
Additionally, after the action period of the fertilizer has elapsed, it is recommended to apply a fertilizer that stimulates the expansion of roots and healthy plant growth, such as (by watering at the roots, as recommended in the product description). Alternatively, 10-14 days after completion of the foliar fungicide treatments, a foliar fertilizer can be applied to stimulate the regeneration of plants after certain stressful conditions, such as , according to the instructions in the product description.
Subsequently, the fertilizer administration can be continued regularly. In the future, it is recommended to respect the optimal environmental conditions and care for this species (Cherry laurel, planting guide and care work).
Given the appearance of the cherry laurels in the photos and those mentioned above, it is not possible to say exactly how they will develop in the future.