Evaluation of a paper by Guarnaccia et al. (2017) on the first report of Phyllosticta citricarpa in Europe

27The Plant Health Panel reviewed the paper by Guarnaccia et al. (2017) and compared theirfindingswith previous predictions on the establishment ofPhyllosticta citricarpa. Four species ofPhyllostictawere found by Guarnaccia et al. (2017) in Europe.P. citricarpaandP. capitalensisare well-definedspecies, withP. citricarparecorded for thefirst time in Europe, confirming predictions by Magareyet al. (2015) and EFSA (2008, 2014, 2016) thatP. citricarpacan establish in some European citrus-growing regions. Two new speciesP. paracitricarpaandP. paracapitalensiswere also described, withP. paracitricarpa(found only in Greece) shown to be pathogenic on sweet orange fruits.Genotyping oftheP. citricarpaisolates suggests at least two independent introductions, with the population inPortugal being different from that present in Malta and Italy.P. citricarpaandP. paracitricarpawereisolated only from leaf litter in backyards. However, sinceP. citricarpadoes not infect or colonise deadleaves, the pathogen must have infected the above living leaves in citrus trees nearby. Guarnacciaet al. (2017) considered introduction to be a consequence ofP. citricarpahaving long been present orof illegal movement of planting material. In the Panel’s view, the fruit pathway would be an equally ormore likely origin. The authors did not report how surveys for citrus black spot (CBS) disease werecarried out, therefore their claim that there was no CBS disease even where the pathogen was presentis not supported by the results presented. From previous simulations, the locations where Guarnacciaet al. (2017) foundP. citricarpaorP. paracitricarpawere conducive forP. citricarpaestablishment, withnumber of simulated infection events by pycnidiospores comparable to sites of CBS occurrence outsideEurope. Preliminary surveys by National Plant Protection Organisations (NPPOs) have not confirmed sofar thefindings by Guarnaccia et al. (2017) but monitoring is still ongoingopenopenJeger, Michael; Bragard, Claude; Caffier, David; Candresse, Thierry; Chatzivassiliou, Elisavet; Dehnen‐Schmutz, Katharina; Gilioli, Gianni; Grégoire, Jean‐Claude; Jaques Miret, Josep Anton; MacLeod, Alan; Navajas Navarro, Maria; Niere, Björn; Parnell, Stephen; Potting, Roel; Rafoss, Trond; Rossi, Vittorio; Urek, Gregor; Van Bruggen, Ariena; Van Der Werf, Wopke; West, Jonathan; Winter, Stephan; Baker, Richard; Fraaije, Bart; Vicent, Antonio; Behring, Carsten; Mosbach Schulz, Olaf; Stancanelli, GiuseppeJeger, Michael; Bragard, Claude; Caffier, David; Candresse, Thierry; Chatzivassiliou, Elisavet; Dehnen‐schmutz, Katharina; Gilioli, Gianni; Grégoire, Jean‐claude; Jaques Miret, Josep Anton; Macleod, Alan; Navajas Navarro, Maria; Niere, Björn; Parnell, Stephen; Potting, Roel; Rafoss, Trond; Rossi, Vittorio; Urek, Gregor; Van Bruggen, Ariena; Van Der Werf, Wopke; West, Jonathan; Winter, Stephan; Baker, Richard; Fraaije, Bart; Vicent, Antonio; Behring, Carsten; Mosbach Schulz, Olaf; Stancanelli, Giusepp

Computing environment for EFSA opinion 10.2903/j.efsa.2018.5114

Computing environment for EFSA opinion 10.2903/j.efsa.2018.5114 in form of a Docker container archive. To create all maps the attached Docker container archive needs to be imported into Docker and started: docker load -i cbs2017-save.tgz docker run -ti --rm cbs2017 /bin/bash From inside the container, all maps can then be generated by running a single command: Rscript makeTableAndMaps.

Data package for EFSA Opinion 10.2903/j.efsa.2018.5114

This is the data package containing the data to reproduce all maps from the EFSA opinion 10.2903/j.efsa.2018.511

demoFCD: First working version

<p>New release to test Zenodo integration</p

Algorithms to solve coupled systems of differential equations in terms of power series

Using integration by parts relations, Feynman integrals can be represented in terms of coupled systems of differential equations. In the following we suppose that the unknown Feynman integrals can be given in power series representations, and that sufficiently many initial values of the integrals are given. Then there exist algorithms that decide constructively if the coefficients of their power series representations can be given within the class of nested sums over hypergeometric products. In this article we will work out the calculation steps that solve this problem. First, we will present a successful tactic that has been applied recently to challenging problems coming from massive 3-loop Feynman integrals. Here our main tool is to solve scalar linear recurrences within the class of nested sums over hypergeometric products. Second, we will present a new variation of this tactic which relies on more involved summation technologies but succeeds in reducing the problem to solve scalar recurrences with lower recurrence orders. The article will work out the different challenges of this new tactic and demonstrates how they can be treated efficiently with our existing summation technologies

Algorithms to solve coupled systems of differential equations in terms of power series

Using integration by parts relations, Feynman integrals can be represented in terms of coupled systems of differential equations. In the following we suppose that the unknown Feynman integrals can be given in power series representations, and that sufficiently many initial values of the integrals are given. Then there exist algorithms that decide constructively if the coefficients of their power series representations can be given within the class of nested sums over hypergeometric products. In this article we will work out the calculation steps that solve this problem. First, we will present a successful tactic that has been applied recently to challenging problems coming from massive 3-loop Feynman integrals. Here our main tool is to solve scalar linear recurrences within the class of nested sums over hypergeometric products. Second, we will present a new variation of this tactic which relies on more involved summation technologies but succeeds in reducing the problem to solve scalar recurrences with lower recurrence orders. The article will work out the different challenges of this new tactic and demonstrates how they can be treated efficiently with our existing summation technologies

The non-first-order-factorizable contributions to the three-loop single-mass operator matrix elements AQg(3)A_{Qg}^{(3)} and ΔAQg(3)\Delta A_{Qg}^{(3)}

The non-first-order-factorizable contributions (The terms 'first-order-factorizable contributions' and 'non-first-order-factorizable contributions' have been introduced and discussed in Refs. \cite{Behring:2023rlq,Ablinger:2023ahe}. They describe the factorization behaviour of the difference- or differential equations for a subset of master integrals of a given problem.) to the unpolarized and polarized massive operator matrix elements to three-loop order, $A_{Qg}^{(3)}$ and $\Delta A_{Qg}^{(3)}$, are calculated in the single-mass case. For the $_2F_1$-related master integrals of the problem, we use a semi-analytic method based on series expansions and utilize the first-order differential equations for the master integrals which does not need a special basis of the master integrals. Due to the singularity structure of this basis a part of the integrals has to be computed to $O(\varepsilon^5)$ in the dimensional parameter. The solutions have to be matched at a series of thresholds and pseudo-thresholds in the region of the Bjorken variable $x \in ]0,\infty[$ using highly precise series expansions to obtain the imaginary part of the physical amplitude for $x \in ]0,1]$ at a high relative accuracy. We compare the present results both with previous analytic results, the results for fixed Mellin moments, and a prediction in the small-$x$ region. We also derive expansions in the region of small and large values of $x$. With this paper, all three-loop single-mass unpolarized and polarized operator matrix elements are calculated

Effects of workpiece microstructure, mechanical properties and machining conditions on tool wear when milling compacted graphite iron

The aim of the present study was to investigate the tool performance when machining compacted graphite iron (CGI) alloys. A comparison was made between solid solution strengthened CGI including various amounts of silicon (Si-CGI) and the pearlitic-ferritic CGI as a reference material. The emphasis was on examining the influence of microstructure and mechanical properties of the material on tool wear in face milling process. Machining experiments were performed on the engine-like test pieces comprised of solid solution strengthened CGI with three different silicon contents and the reference CGI alloy. The results showed up-to 50% lower flank wear when machining Si-CGI alloys, although with comparable hardness and tensile properties. In-depth analysis of the worn tool surfaces showed that the abrasion and adhesion were the dominant wear mechanisms for all investigated alloys. However, the better tool performance when machining Si-CGI alloys was mainly due to a lower amount of abrasive carbo-nitride particles and the suppression of pearlite formation in the investigated solid solution strengthened alloys

The Polarized Three-Loop Anomalous Dimensions from a Massive Calculation

We present results on the calculation of the polarized 2- and 3-loop anomalous dimensions in a massive computation of the associated operator matrix element. We also discuss the treatment of $\gamma_5$ and derive results in the M-scheme.1