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Control of Phytophthora root rot on Mediteranean Quercus spp. Using fosetyl-Al trunk injections. M.

AuthorsGonzález, Mario; Romero, María; Ramo, Cristina ; Serrano, María S. ; Sánchez, María Esperanza
Issue DateDec-2017
PublisherFirenze University Press
CitationPhytopathologia Mediterranea 56(2): 340 (2017)
AbstractPotassium phosphite (PP) is the most used plant defense stimulant against Phytophthora diseases, but PP formulations are prohibited in Spain when registered as fertilizers. In previous pot experiments, fosetyl-aluminium (fos-Al) demonstrated better efficacy than PP for prevention of root disease caused by Phytophthora cinnamomi on Quercus suber and Q. ilex. In November 2014, 4% fos-Al was applied by trunk injection (one 20 mL-injector at each 20 cmperimeter) to trees in two different Quercus woodlands affected by P. cinnamomi. For each woodland, 20 asymptomatic trees (defoliation class, DC = 0), 20 trees with low crown symptoms (10-25% defoliation, DC = 1), and 20 with moderate crown symptoms (26- 50% defoliation, DC = 2), were randomly chosen. For each DC, ten trees were injected with fos-Al and ten with water only. All trees were sampled (rhizosphere soil and rootlets) before treatments. At I year intervals, all trees were evaluated for defoliation class, re-sampled (roots and soil). Samples were checked for P. cinnamomi presence (roots) and P. cinnamomi inoculum density (chlamydospores g-1 dry soil).Disease severity (variation in DC with time) decreased in treated trees when compared with untreated trees, mainly because the treated trees had decreased DCs, but also because untreated trees had increased DCs. Detection of P. cinnamomi in roots increased in the water-treated trees, although soil inoculum densities decreased with time, not differing between treated or untreated trees. This trial has demonstrated the effectiveness of fos-Al for prevention of P. cinnamomi oak disease in the field, decreasing crown symptoms and pathogen detection in roots.
DescriptionTrabajo presentado en el 15th Congress of the Mediterranean Phytopathological Union, celebrado en córdoba (España) del 20 al 23 de junio de 2017.
Publisher version (URL)http://dx.doi.org/10.14601/Phytopathol_Mediterr-20879
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