Peach brown rot control and the relationship of latent infection with postharvest disease

Magno Roberto Pasquetti berghetti

Resumo


The peach brown rot, caused by Monilinia fructicola, is the main disease of the culture, causing significant losses during preharvest and postharvest. This study aimed to evaluate the performance of preharvest fungicide application on brown rot control and verify the role of latent infection and external contamination in postharvest disease. An experiment was carried out to evaluate the performance of six active ingredients (captan, iprodione, iminoctadine, tebuconazole, difenoconazole and azoxystrobin) during preharvest brown rot control and the effect on latent infection. A second experiment was carried out to monitor the latent infection during growth and ripening of the fruit and in order to correlate it with the postharvest disease incidence. The active ingredients iprodione, tebuconazole and difenoconazole were found to be the most efficient in controlling brown rot on the field, while iminoctadine has excellent performance during postharvest control, acting on latent infections. The incidence of latent infections during fruit growth and ripening has a positive correlation with brown rot incidence at postharvest. The highest disease incidence after storage is due to the latent infections manifestation. Effective chemical control in the field, throughout the growing and ripening of fruit, is an important approach to postharvest brown rot control, even after cold storage and during shelf life at 20°C. 

Palavras-chave


cold storage, fungicides, Monilinia fructicola.

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