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The initial deposition amount, dissipation dynamics, retention rate, and field control efficacy of difenoconazole in pepper-soil system were studied with different application dosages, planting regions and patterns. The initial deposition amount of difenoconazole under the same application dosage showed the following order: fruits < cultivated soils < lower stems < upper stems < lower leaves < upper leaves, open field < greenhouse, and Changjiang < Cixi < Hefei < Langfang, respectively, which increased with increasing application dosage. The dissipation rates in leaves, stems, fruits and cultivated soils exhibited an initially fast and then slow trend, while the retention rates displayed a tendency of first increasing and then stabilizing with increasing application dosages. After 7 d of difenoconazole application, the retention rates at five concentrations were 10.3%− 39.1%, and the field efficacy mostly reached the minimum effective dose. These results suggested that difenoconazole could be reduced by 25% based on the minimum recommended dose meeting the requirements of field control efficacy for controlling pepper anthracnose. [Display omitted] • Deposition distribution of difenoconazole was explored in the pepper-planting ecosystem. • Dissipation rate of difenoconazole differed in various plant parts and planting modes. • Dissipation of difenoconazole showed an initially fast and then slow trend. • Retention rate first rose and then stabilized with increasing application dosages. • Application dosages of difenoconazole could be reduced to control pepper anthracnose. [ABSTRACT FROM AUTHOR]