This method specifies a colloidal gold immunochromatographic method for the rapid detection of cyromazine in vegetables and fruits. This method is suitable for the rapid characterization of cyromazine in onions, leaf lettuce, head lettuce, lettuce, stem lettuce leaves, celery, cucumbers, zucchini, luffa, cowpeas, lentils, snow peas, stem lettuce, ginger, and cantaloupe. Determination.