control of anthracnose (Colletotrichum sp.) in postharvest mango fruit CV. HADEN WITH CHITOSAN AND POTASSIUM SORBATE

• DOI: https://doi.org/10.22533/at.ed.9734162416124

• Palavras-chave: inhibition, severity, anthracnose, mango, Haden.

• Keywords: inhibition, severity, anthracnose, mango, Haden.

• Abstract:

  The objective of the study was to evaluate the effectiveness of chitosan and potassium sorbate in the control of anthracnose in postharvest mango fruit cv. Haden. The treatments evaluated were Chitosan at 1 %, Potassium Sorbate at 1.5, 2.5 and 3.5 %, and the combination of Chitosan plus the three concentrations of Potassium Sorbate; distilled water was used as a control treatment. The incidence and diameter of anthracnose lesions were evaluated 3, 6, 9 and 12 days after application of the treatments. A completely randomized experimental design with three replicates was used, three fruits were considered as replicates. Data were analyzed using the Kruskal-Wallis nonparametric test and comparison with the mean rank test. The incidence at 12 days was higher in the control (94.47 %) while the lowest averages were recorded in 2.5 % potassium sorbate and in combination with chitosan. The lesion diameter was higher in the control (20.83 mm) and the lowest values in 2.5 % potassium sorbate (without necrotic lesion) and 1 % chitosan plus 3.5 % sorbate (1.21 mm). These two treatments showed an effectiveness of 100 and 94 % of disease control with respect to the control. However, fruits treated with 1% chitosan and 3.5% potassium sorbate did not ripen normally, since they presented green skin. Potassium sorbate 2.5% can be an ecological alternative for the control of anthracnose in postharvest of mango cv. Haden.