The present invention relates to the use of polyethylene glycol as an effective substance to prevent and/or combat the proliferation of phytoparasitic nematodes on the plant and/or in the soil, as well as the use of polyethylene glycol to combat and/or reduce the damage caused by nematodes to plants, preferably to the rooting apparatus of the plants, and/or to improve the resistance of plants, preferably of the rooting apparatus of the plants, to the attack of nematodes.
