Abstract
Genetic resistance represents a sustainable alternative to disease control in papaya crop. The purpose of this study was to evaluate the use of testers to estimate combining ability and select hybrids resistant to black spot, phoma spot and chocolate spot. The experiment was conducted in a randomized block design with two replications and 20 plants per plot. The severity of phoma spot and black spot on leaves and the lesion area of black spot and chocolate spot on fruits were evaluated in two seasons. The combining ability of the following crosses is negative for all traits: tester 'JS 12' with 'Sunrise Solo' and 'Kaphoro Solo PV'; tester 'Americano' with 'Caliman M5', 'Sunrise Solo', 'Baixinho de Santa Amália' and 'Waimanalo'; and tester 'Maradol' with 'Caliman G', 'Caliman AM' and 'Sunrise Solo PT'. These results may be useful in breeding for disease resistance by hybridization.
Highlights
Papaya (Carica papaya L.) may be affected by various diseases, which constitute the main limiting crop factor, requiring adequate control measures that would not cause major damage to production and marketing
The phoma spot is caused by Phoma caricae-papayae (Tarr) Punith, and anthracnose and chocolate spot share the common etiologic agent Colletotrichum gloeosporioides (Penz.) Penz. & Sacc. in Penz. (Rezende and Fancelli 1997)
This study aims to evaluate testers used in the selection of hybrids resistant to black spot (A. caricae) in leaves and fruits, phoma spot (P. caricaepapayae) on leaves and chocolate spot (C. gloeosporioides) in papaya fruit
Summary
Papaya (Carica papaya L.) may be affected by various diseases, which constitute the main limiting crop factor, requiring adequate control measures that would not cause major damage to production and marketing. Among the diseases that affect the crop stand out black spot, whose causal agent is Asperisporium caricae (Speg.) Maubl. The phoma spot is caused by Phoma caricae-papayae (Tarr) Punith, and anthracnose and chocolate spot share the common etiologic agent Colletotrichum gloeosporioides (Penz.) Penz. The selection of resistant genotypes is a sustainable alternative to disease control in papaya cultivation. Total resistance has not been observed in commercial papaya genotypes with some degree of selection. Crop breeding can contribute to the selection of resistant genotypes, and/or indicated the best hybrid combinations, based on the hybrid vigor, known as heterosis
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