Nematodes are dreadful worms that live in the soil and in the roots of many different crops and weeds. Nematodes are easier to prevent than to control. The secret is to: grow healthy seedlings; destroy all sources of nematodes in and near your vegetable field; rotate with crops that are resistant to nematodes; and avoid introducing nematodes from other fields. Farmers in southern Benin show us how to control nematodes.