GB/T 35331-2017

This standard specifies the methods for detecting and identifying the fungus *Didymella lycopersici* Klebahn, which causes stem canker and fruit rot in tomatoes. It is applied in plant quarantine and agricultural testing contexts, particularly for seed health certification, import/export inspection of tomato seeds and plant materials, and field disease diagnosis. The standard ensures accurate identification of this pathogen to prevent its introduction and spread in tomato-growing regions.