Hello! From the attached pictures, you can see the presence of the Apple Blossom Beetle – Epicometis hirta (Blossom feeder scarab (Tropinota hirta)- pest management). This is a polyphagous pest, which attacks even fruit trees, causing significant damage to the floral organs.
Controlling this pest is quite difficult because it attacks during the flowering period, when it is necessary to protect the useful entomofauna. In our catalogue you will find a bee-friendly insecticide such as , in a dose of 5 ml solution in 10 l water. The pests can also be removed mechanically by shaking the trees in the morning, when they are dormant, followed by the removal and destruction of the adults that have fallen to the ground/on a tarpaulin. During the growing season, you may consider using a fertilizer such as , which has a balanced ratio of nutrients.
It has a high content of organic matter which favors the formation of humus in the soil. The product is applied by incorporation into the top layer of the soil in a dose of 80-100 g/m². Another option is , which is a concentrated NPK (4+6+8) liquid fertilizer with a tonic effect.
More information on the care of this species can be found in this article in the Armuro Community: Magnolia, planting guide and care work .