Abstract
Selection for papaya resistance to multiple diseases in a base population of recurrent selection
Highlights
Papaya (Carica papaya L.) is considered one of the most cultivated and consumed fruit trees in the subtropical and tropical regions of the globe (Serrano and Cattaneo 2010; Carvalho et al, 2020)
The results indicate low repeatability for the traits and that the gains obtained from the use of the combined selection index better rank the genotypes in comparison to the gains obtained by direct selection
The genetic parameters revealed a high environmental effect on the estimates of traits related to resistance to black spot and phoma spot
Summary
Papaya (Carica papaya L.) is considered one of the most cultivated and consumed fruit trees in the subtropical and tropical regions of the globe (Serrano and Cattaneo 2010; Carvalho et al, 2020). Among the main fungal diseases that affect papaya at various stages of its development, the phoma spot Sydow)) stands out, which has the potential to reduce the leaf area and is considered the second major disease of post-harvest fruits; and, the black spot (Asperisporium caricae (Speg.). Maubl.)) that by reducing the photosynthetic area of the leaves and commercially depreciating the fruits, can cause severe losses of production (Liberato et al, 2004; Rezende and Fancelli, 2016). The appearance of the first symptoms of phoma spot and black spot recommend the beginning of disease control in the field (Ritzinger et al, 2000; Rezende et al, 2016). To the black spot control, sprays are made from restricted organic chemical groups such as dithiocarbamates and triazoles, or inorganic as copper oxychloride and cuprous oxide (Agrofit, 2020). The majority use of sprays of these chemical groups can result in 'selection pressure'
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