Chitosan hydrochoride is a natural product that gives different results under different conditions. The synthetic substances in chemical crop protection agents are generally more stable in terms of efficacy. The added value lies precisely in the combination of chemical crop protection agents with Hamerol, in order to use the best of both. Because Hamerol can fill some of the gaps in spraying schedules (caused by chemical agents losing their authorisation), it can contribute to resistance management. Moreover, in some cases it is possible to replace part of the chemistry by Hamerol. Also in crops under the PlanetProof label, the use of certain agents sometimes results in penalty points. If it is possible to replace these agents (partly) by Hamerol, a bonus point can be earned. In the cultivation of vegetables, the use of Hamerol results in a considerable reduction in residues.