The disclosure relates to the use of an oil emulsion for acaricidal, insecticidal, and antifungal treatment of the stems and leaves of a plant during the growth thereof in confined, intensive-cultivation spaces, the emulsion including water and a paraffin oil obtained from petroleum and having a boiling point of 200° C. to 450° C., a viscosity of no more than 20 mm2/s at 40° C., and an unsulfonated residue content of no less than 99% according to the ASTM D483 standard, and further including at least 20 wt % of mono- or polycyclic naphthenes, the paraffinic oil being introduced as a stable emulsifiable concentrate including water.
