Abstract
Abstract In support of breeding of papaya (Carica papaya), the disease incidence and severity of powdery mildew (Ovulariopsis caricicola) were evaluated in papaya genotypes. Two experiments in complete randomized blocks were carried out, one in the field and the other in a greenhouse. In field experiments, the lowest mean disease incidence was observed on the genotypes ‘Costa Rica’ and ‘Baixinho Super’, and the lowest mean disease severity on ‘Caliman M5’, ‘GTF’, ‘SH 11-08’, and ‘JS 11’. In the greenhouse experiment, the genotypes ‘Caliman M5’, ‘Golden’, ‘Kapoho Solo’, ‘Waimanalo’, ‘Mamao Bene’, ‘SH 12-07’, ‘JS 12’, and ‘GTF’ had the lowest mean incidence in at least one evaluation. On the other hand, for severity, the genotypes ‘Diva’, ‘Sunrise Solo 72/12’, ‘Kapoho Solo PA’, ‘Waimanalo’, ‘Maradol’, ‘Maradol GL’, ‘SH 15-04’, ‘FMV, ‘JS 12-4’, ‘SH 12-07’ and ‘Sekati FLM’ had the lowest means. These results indicate these genotypes for a possible use in breeding for reduction of powdery mildew intensity.
Highlights
In Brazil and worldwide, papaya (Carica papaya L.) is an important tropical fruit
Papaya is cultivated in several Brazilian states, of which Bahia, Espírito Santo, Ceará, Minas Gerais, and Rio Grande do Norte are the largest producers
The greenhouse experiment was installed on the campus ‘Leonael Brizola’ of Universidade Estadual do Norte Fluminense Darcy Ribeiro – UENF, in Campos dos Goytacazes, Rio de Janeiro, Brazil
Summary
In Brazil and worldwide, papaya (Carica papaya L.) is an important tropical fruit. Today, Brazil ranks second in global production volume and third in acreage. Despite the high production and consumption of Brazilian papaya, there are several restrictions to an expansion and even the maintenance of papaya plantations. These limitations are due mainly to the high incidence of pests and diseases (Rezende and Martins 2005, Suzuki et al 2007, Martelleto et al 2008). Landraces and obsolete cultivars may contain genes that confer better adaptation to environmental stresses, as well as resistance to numerous pests and diseases (Gepts 2006, Vivas et al 2010, Vivas et al 2012, Vivas et al 2014) These genotypes maintained in genebanks should be described and evaluated
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