By Johan Desaeger The importance of plant-parasitic nematodes (PPN) in agriculture was first demonstrated in the mid-1800s with the discovery of sugar beet cyst nematodes in Europe and root-knot nematodes in Europe and the Americas. Experiments with nematicides in the early-mid 1900s demonstrated the significant yield loss caused by these nematodes. Yet to this day, PPN’s true impact on crop …