(In En) (In Fr) Plant parasitic nematodes, the hidden enemies of crops, are important constraints to crop productivity and yield stability in developing countries where farmers are generally unaware of the presence of these microscopic organisms in their soils. Developing countries do not have adequate trained nematologists to detect the presence of these harmful nematodes and to make management recommendations to farmers. The subtle nature of nematode damage is one of the major reasons why so few efforts have been made to control them. This training course addresses technology transfer to encourage and promote research on nematodes in parts of the semi-arid tropics. Future courses, with participation from researchers in the African region, are envisaged.