Abstract
The development of resistant varieties is a promising strategy for bacterial spot disease (Xanthomonas axonopodis pv. passiflorae-Xap) and passion fruit woodiness disease (PWD; Cowpea aphid-borne mosaic virus-CABMV) control in sour passion fruit (Passiflora edulis Sims). This study aimed at evaluating the reaction of 12 sour passion fruit half-sib progenies to both mechanically inoculated Xap and CABMV, under protected cultivation. The bacterial spot and PWD severity degrees observed reveal the existence of variability within progenies. MAR20#2005 and BRS GA1 revealed the lowest bacterial disease severity scores while MAR20#41, MAR20#2005, and Rosa Intenso 1 showed the lowest PWD severity scores. MAR20#41 presented the lowest disease incidence in all evaluations, demonstrating a slow increase in the number of plants with symptoms over time. Also, MAR20#41 stood out as the progeny with the greatest number of plants presenting resistance to PWD at the end of the study. Among the progenies selected, MAR20#2005 was the most promising for presenting the lowest severity scores for both bacterial spot and PWD.
Highlights
Bacterial spot disease, caused by Xanthomonas axonopodis pv. passiflorae (Xap), is one of the major disease limiting yield in sour passion fruit (Passiflora edulis Sims) orchards
Lower severity scores and progeny × evaluation date interaction were recorded during the dry season both by Nogueira (2016) and Costa et al (2018b) for progenies of the same genotypes evaluated in this study
The bacterial spot and passion fruit woodiness disease (PWD) severity and incidence degrees observed in this study reveal the existence of variability within progenies
Summary
Bacterial spot disease, caused by Xanthomonas axonopodis pv. passiflorae (Xap), is one of the major disease limiting yield in sour passion fruit (Passiflora edulis Sims) orchards. Passiflorae (Xap), is one of the major disease limiting yield in sour passion fruit (Passiflora edulis Sims) orchards. The pathogen infects leaves and fruits, causing expressive damage especially in the hot and humid seasons (Junqueira, Sussel, Junqueira, Zacaroni, & Braga, 2016). The disease starts with small, translucent, and soaked lesions which subsequently become necrotic, with a reddish-brown color (Peruch, Colariccio, & Schroeder, 2011). A chlorotic halo may surround lesions (Junqueira et al, 2016). Xap may reach the vascular bundles, resulting in a systemic invasion of the whole plant, which causes plant drought and death in susceptible cultivars (Peruch et al, 2011; Junqueira et al, 2016)
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