Field Evaluation System for Resistance of Sweet Potato Stem Nematode

[ Objective] The paper was to explore the field evaluation system for resistance of sweet potato stem nematode. [ Method ] The resistance of 52.5 acces- sions was evaluated using naturally induced identification method in diseased field from 2004 to 2009, and the accessions with resistance were selected. [ Result ] The field evaluation system for resistance of sweet p6tato stem nematode was affected by many factors. Non-uniform incidence in fields led to unstable identification results of certain materials. For test problems, some parameters of the existing evaluation system were corrected to reduce the experimental error. E Conclusion The study provided the reference for further improvement of field evaluation system for resistance of sweet potato stem nematode.