Seasonal progression of leaf rust in ‘Niagara Rosada’ grapevine in a biannual crop system in Brazil
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Grapevine leaf rust, which is caused by the fungus Phakopsora euvitis, is an important late-season disease of ‘Niagara Rosada’ (Vitis labrusca) grapevine in Brazil. The early defoliation of plants caused by the disease impairs fruit ripening and reduces marketable yield. In a study carried out in northern Paraná State, the temporal progression of grapevine leaf rust was quantified in a production system of ‘Niagara Rosada’ grapevine with two growing seasons per year: mid-summer-autumn and late winter-spring. The influence of weather-related variables on rust progression was examined through correlation analyses. It was observed that the rust was more severe in summer-autumn than in winter-spring. Significant positive linear correlations (P ≤ 0.05) were found between rust severity and rainfall (r ≥ 0.90) and average daily hours of leaf wetness (r ≥ 0.82). In addition, negative correlation was found between rust severity and temperature (r ≥ −0.84) in the mid-summer/autumn season. Mild temperatures in autumn were considered decisive for rust progression. In Brazilian tropical viticulture, management strategies for grapevine leaf rust must consider the risk of rust damage in autumn caused by temperature.
KeywordsPhakopsora euvitis Vitis Epidemiology Fungal diseases Grape Viticulture
This research was supported by funds from the National Council for Scientific and Technological Development (CNPq; grant 550.552/2009-0), and CAPES Foundation of the Ministry of Education of Brazil (grant BEX 8576/11-4) for sandwich program at University of Florida.
This study was funded by the National Council for Scientific and Technological Development of Brazil (CNPq; grant 550.552/2009–0) and CAPES Foundation of the Ministry of Education of Brazil (scholarship grant BEX 8576/11–4).
Compliance with ethical standards
Conflict of interest
Claudia R. Scapin-Buffara declares that she has no conflict of interest; Francislene Angelotti declares she has no conflict of interest; Nicholas S. Dufault declares he has no conflict of interest; Carolina B. Pereira declares she has no conflict of interest; and Dauri J. Tessmann declares he has no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
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