Research progress over recent years on nematicidal Bacillus thuringiensis (B.t.) and its toxins was introduced, the species of nematicidal B.t. and nematode killed by B.t., the structure and toxicological mechanism of nematicidal toxins and related patents were extended. The cloning and expression of nematicidal genes and the application of B.t. preparation were discussed. The prospect of nematode biocontrol b...