The article outlines changes to the Mcf policy for seed potatoes in the Netherlands, effective from 2019. It introduces the requirement for potatoes grown within a one-kilometer radius of an infected plot to be examined for Mcf in the following year. If not found to be free, the grower will not receive a NAK certificate. Over time, this investigation responsibility shifts to the specific plot. Lifting of this obligation occurs after two consecutive Mcf-free potato crops. The article also allows for testing of potatoes grown on Mcf-infected plots for nematode presence. However, finding Mcf can impact potato sales, especially for exports to third countries. The NAK provides an application form for growers to have plots tested.