Pest categorisation of Nacobbus aberrans

Jeger, Michael; Bragard, Claude; Caffier, David; Candresse, Thierry; Chatzivassiliou, Elisavet; Dehnen‐Schmutz, Katharina; Gilioli, Gianni; Grégoire, Jean‐Claude; Miret, Josep Anton Jaques; MacLeod, Alan; Navarro, María Navajas; Parnell, Stephen; Potting, Roel; Rafoss, Trond; Rossi, Vittorio; Urek, Gregor; Bruggen, Ariena Van; Werf, Wopke Van der; West, Jonathan; Winter, Stephan; Kałuski, Tomasz; Niere, Björn

doi:10.2903/j.efsa.2018.5249

Cited by 30 publications

(41 citation statements)

References 19 publications

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“…Root-knot nematode (RKN) (Meloidogyne spp.) infestation is a soil-borne disease that has a wide-ranging and serious damage worldwide; it is difficult to control and its incidence has continuously increased in recent years (Kerry 2000;Jeger et al 2018). According to Food and Agriculture Organization of the United Nations (FAO) statistics, the annual loss caused by plant parasitic nematodes is more than 157 billion dollars worldwide; hence, infestation with such nematodes has been considered the fourth type of invasive disease that harms plants (Abad et al 2008;Oka et al 2000;John et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Exploring the key microbial changes in the rhizosphere that affect the occurrence of tobacco root-knot nematodes

et al. 2020

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Root-knot nematode (RKN) disease is a soil-borne disease. However, most studies on RKN have focused on the screening of agents and the cultivation of resistant varieties, and reports on the interaction of RKNs with soil microorganisms are few. In this study, we performed Illumina high-throughput sequencing to analyze diseased and healthy soil and the microbial-community changes in rhizosphere soil after microbial treatment (Pseudomonas flurescens, Bacillus subtilis, Paecolomyces lilacinus). Results showed significant differences in the bacterial community richness and diversity between diseased and healthy soil and the presence of different microbial species. After treatment, the richness and diversity of microbial communities in soil, as well as the number and incidence of second-stage juvenile of RKNs, decreased. Through linear discriminant analysis effect size, Pearson correlation, and Venn diagram analysis, we screened five genera that were closely related to disease occurrence, among which Pseudomonas was most related to disease inhibition. Our results suggested that the occurrence of tobacco RKN was related to changes in soil microbial communities, and that the interactions among Pseudomonas, Bryobacter, Variibacter, Coniochaeta, and Metarhizium affected the health of rhizosphere soil.

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Section: Introductionmentioning

confidence: 99%

Exploring the key microbial changes in the rhizosphere that affect the occurrence of tobacco root-knot nematodes

et al. 2020

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“…According to the EFSA Scientific Opinion on pest categorization of N. aberrans published in 2018, all populations of N. aberrans sensu lato are highly polyphagous and could attack and cause severe damage to many important host plants in the EU. Yield losses reported on crops infected by N. aberrans depend on initial density, climatic conditions, soil type and crop cultivar and average 65% for potato in the Andean region of South America, and 55% and 36% for tomato and bean, respectively in Mexico (Inserra et al, 2004;EFSA, 2018). The false root-knot nematode is adapted to different climatic conditions and has been reported from temperate and subtropical regions of North (USA, Mexico) and South America (Argentina, Bolivia, Chile, Ecuador and Peru) (EFSA Journal, 2018).…”

Section: Pra Informationmentioning

confidence: 99%

“…Tubers and roots inhabited by the vermiform and motile stages of N. aberrans escape any visual inspection. The absence of symptoms (galls) in certain plants is possible and the presence of N. aberrans within tubers of ulluco may be overlooked (EFSA, 2018).…”

Section: Presence Of Asymptomatic Plantsmentioning

confidence: 99%

Commodity risk assessment of Ullucus tuberosus tubers from Peru

Bragard¹,

Dehnen‐Schmutz²,

Serio³

et al. 2021

EFS2

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The European Commission requested the EFSA Panel on Plant Health to prepare and deliver risk assessments for commodities listed in Commission Implementing Regulation ( EU ) 2018/2019 as ‘High risk plants, plant products and other objects. This Scientific Opinion covers plant health risks posed by tubers of Ullucus tuberosus imported from Peru, taking into account the available scientific information, including the technical information provided by Peru. The relevance of an EU quarantine pest for this opinion was based on evidence that: (i) the pest is present in Peru, (ii) U. tuberosus is a host of the pest and (iii) the pest can be associated with the commodity. The relevance of any other pest, not regulated in the EU , was based on evidence that: (i) the pest is present in Peru (ii) the pest is absent in the EU ; (iii) U. tuberosus is a host of the pest; (iv) the pest can be associated with the commodity and (v) the pest may have an impact and can pose a potential risk for the EU territory. There are five pests i.e. one insect ( Amathynetoides nitidiventris ), two nematodes ( Atalodera andina and Nacobbus aberrans ) and two viruses (the Andean potato latent virus ( APLV ) and the potato virus T ( PVT )) that fulfilled all relevant criteria were selected for further evaluation. For the five pests, the risk mitigation measures proposed in the technical dossier from Peru were evaluated taking into account the possible limiting factors. For each of the five pests, an expert judgement is given on the likelihood of pest freedom taking into consideration the risk mitigation measures acting on the pest, including uncertainties associated with the assessment. The degree of pest freedom varies among the pests evaluated, with PVT being the pest most frequently expected on the imported commodities. The Expert Knowledge Elicitation indicated, with 95% certainty, that between 9,157 and 10,000 tubers out of 10,000 would be free of PVT .

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“…disease is an important crop disease that has become one of the main factors limiting sustainable crop production ( Gorny et al, 2019 ; Hemmati and Saeedizadeh, 2020 ). RKN infects plant roots and forms nodules, which hinder the absorption of nutrients and water by the roots, leading to wilting and withering; in addition, RKN infection reduces plant resistance, causes wounds, is conducive to infection by other pathogens, and often causes complex diseases ( EFSA Panel on Plant Health et al, 2018 ; Khan and Ahamad, 2020 ), such as Fusarium wilt, root rot, and bacterial diseases ( Khan and Ahamad, 2020 ; Leonetti and Molinari, 2020 ). With the prohibition of methyl bromide and the appearance of chemical nematicides with high toxicity and high residue, such as imidacloprid, aldicarb, and carbofuran, there are few nematicides that both have the control effect and are safe for use in agriculture ( Huang et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Tobacco Root Microbial Community Composition Significantly Associated With Root-Knot Nematode Infections: Dynamic Changes in Microbiota and Growth Stage

Cao

Yang

et al. 2022

Front. Microbiol.

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The root-knot nematode (RKN) is an important pathogen that affects the growth of many crops. Exploring the interaction of biocontrol bacteria-pathogens-host root microbes is the theoretical basis for improving colonization and controlling the effect of biocontrol bacteria in the rhizosphere. Therefore, 16S and 18S rRNA sequencing technology was used to explore the microbial composition and diversity of tobacco roots (rhizosphere and endophytic) at different growth stages in typical tobacco RKN-infected areas for 2 consecutive years. We observed that RKN infection changed the α-diversity and microbial composition of root microorganisms and drove the transformation of microorganisms from bacteria to fungi. The abundance of Sphingomonas decreased significantly from 18% to less than 3%, while the abundance of Rhizobiaceae increased from 4 to 15% at the early growth stage during the first planting year, and it promoted the proliferation of Chryseobacterium at the late growth stage in rhizosphere microorganisms with the highest abundance of 17%. The overall trend of rhizosphere microorganisms changed in the early growth stage with increasing growth time. The specific results were as follows: (1) Rhizobiaceae and Chryseobacterium increased rapidly after 75 days, became the main abundant bacteria in the rhizosphere microorganisms. (2) The dominant flora in fungi were Fusarium and Setophoma. (3) Comparing the root microbes in 2017 and 2018, RKN infection significantly promoted the proliferation of Pseudomonas and Setophoma in both the rhizosphere and endophytes during the second year of continuous tobacco planting, increasing the relative abundance of Pseudomonas from 2 to 25%. Pseudomonas was determined to play an important role in plant pest control. Finally, a total of 32 strains of growth-promoting bacteria were screened from tobacco rhizosphere bacteria infected with RKN through a combination of 16S rRNA sequencing and life-promoting tests. The results of this research are helpful for analyzing the relationship between RKNs and bacteria in plants, providing reference data for elucidating the pathogenesis of RKNs and new ideas for the biological control of RKNs.

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Pest categorisation of Nacobbus aberrans

Cited by 30 publications

References 19 publications

Exploring the key microbial changes in the rhizosphere that affect the occurrence of tobacco root-knot nematodes

Exploring the key microbial changes in the rhizosphere that affect the occurrence of tobacco root-knot nematodes

Commodity risk assessment of Ullucus tuberosus tubers from Peru

Tobacco Root Microbial Community Composition Significantly Associated With Root-Knot Nematode Infections: Dynamic Changes in Microbiota and Growth Stage

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