Inhibition of the lemon brown rot causal agent Phytophthora citrophthora by low-toxicity compounds.

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ID: 263845
2020
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Abstract
Phytophthora spp., soil-borne oomycetes, cause brown rot (BR) on postharvest lemons. The management of this disease is based on cultural practices and chemical control using inorganic salts of limited efficacy. In the search for new alternatives, the aim of this work was to evaluate the effect of low-toxicity compounds to inhibit the growth of P. citrophthora and to control BR disease on lemons. Sodium bicarbonate, potassium sorbate, polyhexamethylene guanidine, Ascophyllum nodosum extract and a formulation containing phosphite salts plus A. nodosum (P+An) were evaluated.All tested products inhibited mycelial growth, sporangia formation and zoospore germination of P. citrophthora in vitro. In postharvest applications on artificially inoculated lemons, only P+An exhibited a BR curative effect, with incidence reduction of around 60%. When this formulation was applied in field treatments, BR incidence was reduced by 40% on lemons harvested and inoculated up to 30 days post application.Our results demonstrate the in vitro direct anti-oomycete effect of low-toxicity compounds and the in vivo efficacy of P+An formulation to control BR, encouraging the incorporation of the latter in the management of citrus BR. © 2020 Society of Chemical Industry.
Reference Key
olmedo2020inhibitionjournal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Olmedo, Gabriela M;Baigorria, Carina G;Ramallo, Ana C;Sepulveda, Milena;Ramallo, Jacqueline;Volentini, Sabrina I;Rapisarda, Viviana A;Cerioni, Luciana;
Journal Journal of the science of food and agriculture
Year 2020
DOI
10.1002/jsfa.10990
URL
Keywords
Citrus ascophyllum nodosum gras salts phmg oomycete

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