A simple and effective preparation for the protection of in vitro-derived seedlings from phytopathogens has been developed by a scientific team of NUST MISIS together with colleagues from Voronezh and Tambov. Small doses of copper oxide nanoparticles in its composition work as an immunostimulator of plants. As a result, scientists are planning to obtain a preparation that will increase the amount of harvested planting material. The results of the work have been published in the Nanomaterials international scientific journal.