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Factors influencing the performance of phosphites on the control of coffee leaf rust

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dc.contributor.author Honorato Júnior, Jaime
dc.contributor.author Debona, Daniel
dc.contributor.author Zambolim, Laércio
dc.contributor.author Rodrigues, Fabrício Ávila
dc.date.accessioned 2021-12-02T12:34:29Z
dc.date.available 2021-12-02T12:34:29Z
dc.date.issued 2021
dc.identifier.citation HONORATO JÚNIOR, J. et al. Factors influencing the performance of phosphites on the control of coffee leaf rust. Bragantia, Campinas, v. 80, p. 1-7, 2021. pt_BR
dc.identifier.issn 1678-4499
dc.identifier.uri https://doi.org/10.1590/1678-4499.20200176 pt_BR
dc.identifier.uri http://www.sbicafe.ufv.br/handle/123456789/12863
dc.description.abstract This study investigated the effect of different phosphites on the control of coffee leaf rust (CLR) caused by Hemileia vastatrix, considered the major disease affecting coffee yield worldwide. Three-month-old coffee plants were sprayed with two doses each of the phosphite solutions (standard and double), as follows: K (40% P2O5; 1.5 and 3 mL·L-1), K (30% P2O5; 3 and 6 mL·L-1), Cu (2.5 and 5 mL·L- 1), Mn+Zn (3 and 6 mL·L-1) and Na (3 and 6 mL·L-1) 24 h before being inoculated with H. vastatrix. Leaves were not washed or washed with deionized water after the foliar phosphites spray. Plants sprayed with water served as the control treatment. Inoculation was performed on the abaxial side of the first pair of expanded leaves using a camel hairbrush with a suspension of urediniospores (1 mg per leaf). All phosphites applied at the standard doses (from 1.5 to 3 mL·L-1) reduced the total number of pustules (TNP) per leaf by 28-69% regardless of washing treatment. The biggest reductions were observed for Cu phosphite, which decreased the TNP per leaf by 60 and 69% without and with leaf washing, respectively. A similar trend was observed when the double doses of phosphites (from 3 to 6 mL·L-1) were used, though Na phosphite without leaf washing and Mn/Zn phosphite without and with leaf washing were not efficient to reduce the TNP per leaf. Without leaf washing, only Cu and Na phosphites decreased CLR severity at the standard doses (53-61%), whereas all phosphites, except the Mn/ Zn phosphite, reduced CLR severity at the double dose. The CLR severity was decreased using K 30%, K 40% and Cu phosphites When applied at the standard doses with leaf washing (41-59%). With double doses, only Cu and Na phosphites decreased CLR severity by 55% for both treatments. In conclusion, the efficiency of the phosphites for CLR control varied according to the accompanying cation, dose and washing conditions. The Cu phosphite resulted in the best CLR control regardless of the dose used and the washing conditions. pt_BR
dc.format pdf pt_BR
dc.language.iso en pt_BR
dc.publisher Instituto Agronômico (IAC) pt_BR
dc.relation.ispartofseries Bragantia;v.80, 2021
dc.rights Open Access pt_BR
dc.subject Coffea arabica L. pt_BR
dc.subject Disease control pt_BR
dc.subject Induced resistance pt_BR
dc.subject.classification Cafeicultura::Pragas, doenças e plantas daninhas pt_BR
dc.title Factors influencing the performance of phosphites on the control of coffee leaf rust pt_BR
dc.type Artigo pt_BR

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