Winter pruning: option for management against alternaria brown spot (Alteraria alternata f. sp. citri) in Honey Murcott tangor [Citrus reticulata Blanco x C. sinensis (L.) Osbeck]

• DOI: 10.21475/ajcs.19.13.10.p1849
• Publication Date: 2019-12-12T01:41:13Z
• Authors: Fernando Alves de...; Thiago Fernando M...; Patrícia Marluci ...; Camilla de Andrad...; Rodrigo Martinelli; Marinês Bastianel
• Keywords: Pruning

Alternaria brown spot (ABS), caused by alternata f. sp. citri, is the main fungal disease plaguing tangerines. The symptoms are falling leaf and fruit, resulting in loss of production quality. initial leaves characterized small or black spots, surrounded, not, yellowish halos. In dark cortical patches appear that can easily break. this study, winter pruning plants was investigated to complementary control ABS. experiment conducted 10-year-old Honey Murcott tangor plants, where two treatments were applied: no pruning, using a randomized block design with ten replicates. treatment performed before flowering (September Brazil), branches cut close trunk, thicker removed. chemical both treatments. Evaluations severity fruit diagrammatic scale; incidence area under progress curve (AUDPC) also calculated. drop yield (t ha-1) quantified, temperature humidity inside canopy measured. Winter had positive effect on ABS management since it provided decrease incidence, severity, AUDPC values. Fruit fall reduced, greater productivity for plants. results confirmed alternaria spot.