Peach rusty spot is caused by the apple powdery mildew fungus, Podosphaera leucotricha

Jankovics, Tünde and Dolovac, Nenad and Bulajic, Aleksandra and Krstic, Branka and Pascal, Thierry and Bardin, Marc and Nicot, Philippe C. and Kiss, Levente (2011) Peach rusty spot is caused by the apple powdery mildew fungus, Podosphaera leucotricha. Plant Disease, 95 (6). pp. 719-724. ISSN 0191-2917

Abstract

Peach rusty spot, an economically important disease of peach (Prunus persica var. persica), appears as necrotic spots on fruit. The etiology of the disease is still not well understood, although it has long been suspected that the causal agent is the apple powdery mildew pathogen, Podosphaera leucotricha. This work confirmed this hypothesis based on cross-inoculation experiments and analysis of rDNA internal transcribed spacer sequences polymerase chain reaction amplified from rusty spot and peach powdery mildew lesions. Cross-inoculations of apple and peach leaves with P. leucotricha and P. pannosa, the causal agent of peach powdery mildew, showed that (i) young peach fruit, up to 5 cm in diameter, developed symptoms typical of rusty spot following inoculation with P. leucotricha; (ii) leaves of 'Jonagold' apple seedlings developed powdery mildew infections when inoculated by touching young rusty spot lesions to their surfaces; (iii) P. leucotricha sporulated on young peach fruit up to 5 cm in diameter; and (iv) peach leaves and young shoots were not susceptible to P. leucotricha, whereas P. pannosa infected all the green parts of peach. A field experiment revealed that there was only a 2- to 3-week period of time during early peach fruit development when the epidermis was susceptible to P. leucotricha. An outcome of this study is that now a clear distinction can be made between the symptoms caused by P. pannosa and P. leucotricha on peach.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version due to publisher copyright policy. However, article can be freely accessed through the publisher's website at: http://apsjournals.apsnet.org/doi/abs/10.1094/PDIS-10-10-0711
Faculty / Department / School: No Faculty
Date Deposited: 29 May 2017 01:50
Last Modified: 29 May 2017 01:50
Uncontrolled Keywords: peach rusty spot; fungal pathogens and diseases; plant pathology and symbiosis; apple powdery mildew; cross-inoculation, spacer sequences; PCR; peach fruit; Erysiphales; fungi; Malus x domestica; Podosphaera leucotricha; Prunus; Prunus persica
Fields of Research : 06 Biological Sciences > 0607 Plant Biology > 060704 Plant Pathology
06 Biological Sciences > 0605 Microbiology > 060505 Mycology
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
Identification Number or DOI: 10.1094/PDIS-10-10-0711
URI: http://eprints.usq.edu.au/id/eprint/31890

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