Historical, the role of plant parasitic nematodes in agriculture, methods of controlling nematodes, experimental techniques, training suggestions for nematologists; Collecting soil and plant material. Processing soil and plant material; Microscopic techniques. Preparation of permanent microscopic slides, morphology of nematodes, identifying nematodes, describing a new species; Classification of the phylum nemata. Outline of order tylenchida; Tylenchinae: genera tylenchus, tylenchorlynchus, tetylendrus, psilenchus, macrotrophurus, and trophurus; Genera ditylenchus and pseudhalenchus; Genus anguina; Subfamily hoplolaiminae; Subfamily pratylenchinae. Genera of uncertain position; Family neotylenchidae; Family heteroderidae. Genus heterodera; Generameloidogyne and meloidodera; Family criconematidae; Family tylenchulidae; Superfamily aphelenchoidea; Order rhabditida: families rhabditidae, cephalobidae; Miscellaneous representatives of class adenophorea.