Control of anthracnose in papaya fruits by acetylsalicylic acid and 1-methylcyclopropene

Luiz Eduardo Bassay Blum,Leonardo Ferreira Lopes,André Freire Cruz,Mariana Coelho de Sena

doi:10.14393/bj-v36n1a2020-42511

Luiz Eduardo Bassay Blum, Leonardo Ferreira Lopes + Show 2 more

Open Access

https://doi.org/10.14393/bj-v36n1a2020-42511

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Abstract

This study assessed the effect of acetylsalicylic acid (ASA) and 1-methylcyclopropene (1-MCP) to control anthracnose in papaya (cultivar Golden). Disinfested-surface fruits were inoculated with Colletotrichum gloeosporioides and then the compounds were applied. The lesion diameters and the physical-chemical properties were analyzed. Assays were carried out with ASA and 1-MCP targeting the control of anthracnose and maintenance of the fruit’s physical-chemical properties. The effect of ASA (20 mM; 20 min) on reducing lesion diameter occurred when applied before inoculation. Fruits treated with 1-MCP (300ppb) for 12 h showed a smaller lesion diameter than control. For the physical-chemical analysis, fruit treated with 1-MCP (200; 300 ppb; 12h) maintained fruit firmness, delayed fruit ripening and fruit fresh weight loss.

Highlights

Papaya (Carica papaya L.) is a perennial fruit plant from the Caricaceae family, and it is a crucial crop in Brazil and in other tropical and subtropical regions worldwide
Papaya fruits showing post-harvest anthracnose symptoms present sunken, prominent, dark brown to black lesions (DICKMAN, 1994). The control of this disease sometimes leads to other problems, since in some cases the treatments affect the ripening process, and the use of fungicides for extended periods may lead to the appearance of fungicide resistant Colletotrichum strains (GAMAGAE et al, 2003)
Similar results were found by Pesis et al (2002), who observed that the application of 100 to 300 nL L-1 of 1-MCP in Hass avocado significantly reduced the development of rot spots

Summary

Introduction

Papaya (Carica papaya L.) is a perennial fruit plant from the Caricaceae family, and it is a crucial crop in Brazil and in other tropical and subtropical regions worldwide. Papaya fruits showing post-harvest anthracnose symptoms present sunken, prominent, dark brown to black lesions (DICKMAN, 1994) The control of this disease sometimes leads to other problems, since in some cases the treatments affect the ripening process, and the use of fungicides for extended periods may lead to the appearance of fungicide resistant Colletotrichum strains (GAMAGAE et al, 2003). The exogenous application of ASA to inhibit ethylene production in Kiwi fruits was showed, resulting in delayed fruit ripening by interfering with ethylene biosynthesis and perception (YIN et al, 2013). This compound might reduce postharvest papaya anthracnose

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