The effect of application of copper fungicides on photosynthesis parameters and level of elementary copper in hops

Krofta, Karel; Pokorný, J.; Kudrna, Tomáš; Ježek, J.; Pulkrábek, J.; Křivánek, J.; Bečka, D.

doi:10.17221/437/2011-pse

Cited by 5 publications

(6 citation statements)

References 15 publications

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“…This appears to be independent of application frequency and is likely dependent on the date of application relative to harvest. Similar findings of significantly increased copper concentrations have been reported in the application of copper sulfate [17] and copper oxychloride [30] in hops. The distribution of other elements measured in the present study does not appear to be impacted by the use of this copper hydroxide fungicide.…”

Section: Hop Elemental and Metal Contentsupporting

confidence: 86%

“…Krofta et al applied copper oxychloride fungicides to hop plants and monitored the copper content of the hop cones and leaves for an extended period following the applications. [30] It was found, generally, that the highest concentrations of elemental copper in hop cones were in those cones sampled closest to the date of the fungicide application, and the amount of copper decreased gradually over time. This trend was much more apparent in the copper content of the leaves as the increased foliar surface area resulted in greater fungicide deposition.…”

Section: Hop Elemental and Metal Contentmentioning

confidence: 96%

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Effect of Copper-Based Fungicide Treatments on the Quality of Hop Produced in the Northeastern United States

Chrisfield

Gugino

Hopfer

et al. 2021

Journal of the American Society of Brewing Chemists

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The quality of hops is dictated in large part by the content of flavor and aroma compounds. These compounds vary in concentration and are affected by agricultural practices. Previous research has found that the application of Bordeaux Mixture may impact the aroma quality of hops by altering concentrations of varietal thiols. The impact of copper fungicides other than Bordeaux Mixture and in hop production areas outside of the Pacific Northwest in the United States has yet to be evaluated. Herein we study the effects of application frequency of a copper (II) hydroxide fungicide on markers of hop quality in hops grown in the Northeastern United States. Copper fungicide application was found to significantly increase the total copper content of hop cones, regardless of application frequency; however, traditional markers of hop quality, including yield, essential oil composition, and acid content, were not affected. Beer consumers were unable to discriminate between beers dry-hopped with conventional or copper-treated hops based on aroma but were able to discriminate based on in-mouth perception. These findings suggest that the use of copper (II) hydroxide for the mitigation of fungal pathogens in hops grown in the Northeastern United States is unlikely to adversely affect final hop yield, acid content, or thiol quality.

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Section: Hop Elemental and Metal Contentsupporting

confidence: 86%

Section: Hop Elemental and Metal Contentmentioning

confidence: 96%

Effect of Copper-Based Fungicide Treatments on the Quality of Hop Produced in the Northeastern United States

Chrisfield

Gugino

Hopfer

et al. 2021

Journal of the American Society of Brewing Chemists

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“…Crop Sci. applied cooper and its content in hops has not yet been reported (Weihrauch et al, 2015;Krofta et al, 2012). The aim of this work was to investigate the copper content as well as to assess the influence whether beers containing high amounts of hops shows higher Cu content.…”

Section: Introductionmentioning

confidence: 97%

“…All these ingredients are endogenous sources of metals in beer, one in particular is Cu (Hardwick, 1994). Copper content is an important ingredient during the brewing process since it is essential for many malt enzymes and yeast growth (Krofta et al, 2012). Regarding quality, positive effects of Cu on beer has been attributed to foaming quality and flavour enhancement (Pohl, 2008).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of copper content in beers obtained from retail in Sweden

Osorio-MacÃas¹,

PeÃ±arrieta²

2017

J. Brew. Distilling

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A quantitative study of copper (Cu) content in 19 different beer brands produced in mainly European countries and consumed in Sweden were measured using atomic absorption spectrophotometer without sample digestion. Results showed that the Cu content in beers is below the permissible levels concentrations for potable drinking water recommended by World Health Organization. In addition, the studies indicated that there is no correlation between the amount of Cu content in beers and their respective hops Cu content.

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“…Czech hops occupy a significant position in the worldwide beer production due to their distinctive characteristics (Rybáček 1991, Krofta et al 2012. Purchasers put more and more emphasis not only on brewing parameters of hop product, but above all on absolute purity of hop granules in relation to undesirable impurities (Krofta and Ježek 2010).…”

mentioning

confidence: 99%

The effect of work of inclined belt conveyors on the quality of hop separation in hop picking line

Rybka¹,

Heřmánek²,

Honzík³

et al. 2014

PLANT SOIL ENVIRON

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The article summarizes the results of a two-year research focused on separating impurities in hop picking line by means of inclined belt conveyors. Researchers designed a new version of inclined belt conveyors which were installed in one segment of a parallel hop picking line. In the other segment the current inclined belt conveyors remained. Regarding the product quality, better results were obtained with new inclined belt conveyors where the average content of impurities at the output was 7.73%, contrary to the treatment with current conveyors where the content of impurities was 12.03%. The current inclined belt conveyors had 4.8 times higher losses of hops than the new ones. The economic assessment clearly proves the use of new inclined belt conveyors to be more effective, as the return of the costs for the exchange of six inclined belt conveyors in a picking line makes only 3.13 years at a comparable or even better quality of separation.

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The effect of application of copper fungicides on photosynthesis parameters and level of elementary copper in hops

Cited by 5 publications

References 15 publications

Effect of Copper-Based Fungicide Treatments on the Quality of Hop Produced in the Northeastern United States

Effect of Copper-Based Fungicide Treatments on the Quality of Hop Produced in the Northeastern United States

Evaluation of copper content in beers obtained from retail in Sweden

The effect of work of inclined belt conveyors on the quality of hop separation in hop picking line

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