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  • 1
    In: NeoBiota, Pensoft Publishers, Vol. 84 ( 2023-05-18), p. 9-40
    Abstract: Emerging and invasive tree pests and pathogens in Europe are increasing in number and range, having impacts on biodiversity, forest services, ecosystems and human well-being. Stakeholders involved in tree and forest management contribute to the detection and management of new and emerging tree pests and pathogens (PnPs). We surveyed different groups of stakeholders in European countries. The stakeholders were mainly researchers, tree health surveyors and forest managers, as well as forest owners, nurseries, policy-makers, advisors, forestry authorities, NGOs and civil society. We investigated which tools they used to detect and manage PnPs, surveyed their current PnP awareness and knowledge and collated the new and emerging PnP species of concern to them. The 237 respondents were based in 15 European countries, with the majority from the United Kingdom, France and the Czech Republic. There was a strong participation of respondents with a work focus on research and surveying, whereas timber traders and plant importers were less represented. Respondents were surveyed on 18 new, emerging PnPs in Europe and listed an additional 37 pest species and 21 pathogen species as potential future threats. We found that species on EPPO’s list of ‘priority pests’ were better known than those not listed. Stakeholders working in urban environments were more aware of PnPs compared to those working in rural areas. Stakeholders’ awareness of PnPs was not related to the number of new, emerging PnP species present in a country. Stakeholders want access to more detection and management tools, including long-term citizen-science monitoring, maps showing spread and range of new PnPs, pest identification smartphone apps, hand-held detection devices, drone monitoring and eDNA metabarcoding. To help facilitate better forest health across Europe, they called for mixed forest development, reduced nursery stock movement, biosecurity and data sharing amongst organisations. These results indicate that stakeholder knowledge of a few key PnP may be good, but given that the large diversity of threats is so large and future risks unknown, we conclude that multiple and varied methods for generic detection, mitigation and management methods, many in development, are needed in the hands of stakeholders surveying and managing trees and woodlands in Europe.
    Type of Medium: Online Resource
    ISSN: 1314-2488 , 1619-0033
    Language: Unknown
    Publisher: Pensoft Publishers
    Publication Date: 2023
    detail.hit.zdb_id: 2628537-X
    SSG: 21
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  • 2
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 81, No. 10 ( 2015-05-15), p. 3492-3501
    Abstract: We hypothesized that interactions between fusarium head blight-causing pathogens and herbivores are likely to occur because they share wheat as a host plant. Our aim was to investigate the interactions between the grain aphid, Sitobion avenae , and Fusarium graminearum on wheat ears and the role that host volatile chemicals play in mediating interactions. Wheat ears were treated with aphids and F. graminearum inoculum, together or separately, and disease progress was monitored by visual assessment and by quantification of pathogen DNA and mycotoxins. Plants exposed to both aphids and F. graminearum inoculum showed accelerated disease progression, with a 2-fold increase in disease severity and 5-fold increase in mycotoxin accumulation over those of plants treated only with F. graminearum . Furthermore, the longer the period of aphid colonization of the host prior to inoculation with F. graminearum , the greater the amount of pathogen DNA that accumulated. Headspace samples of plant volatiles were collected for use in aphid olfactometer assays and were analyzed by gas chromatography-mass spectrometry (GC-MS) and GC-coupled electroantennography. Disease-induced plant volatiles were repellent to aphids, and 2-pentadecanone was the key semiochemical underpinning the repellent effect. We measured aphid survival and fecundity on infected wheat ears and found that both were markedly reduced on infected ears. Thus, interactions between F. graminearum and grain aphids on wheat ears benefit the pathogen at the expense of the pest. Our findings have important consequences for disease epidemiology, because we show increased spread and development of host disease, together with greater disease severity and greater accumulation of pathogen DNA and mycotoxin, when aphids are present.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    RVK:
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2015
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    detail.hit.zdb_id: 1478346-0
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    Scientific Societies ; 2017
    In:  Plant Disease Vol. 101, No. 11 ( 2017-11), p. 1903-1909
    In: Plant Disease, Scientific Societies, Vol. 101, No. 11 ( 2017-11), p. 1903-1909
    Abstract: Honey fungus (Armillaria spp.) root rot is the disease most frequently inquired about by U.K. gardeners to the Royal Horticultural Society. Armillaria epidemiology has been studied within forestry and agriculture, but data are lacking within gardens, which have greater host plant diversity than orchards and vineyards and greater disturbance than woodlands. Which Armillaria species are responsible for garden disease, and how the broad range of susceptible ornamentals are differentially affected is not known. To address this, isolates of Armillaria were obtained from dead and dying plants from across the U.K. over a 4-year period (2004 to 2007). Species were identified by PCR-RFLP for IGS, and further verified by species-specific PCR for EF-1 α. Of the seven species known in the U.K., three were identified: A. mellea (83.1%), A. gallica (15.8%), and A. ostoyae (1.1%). Armillaria was isolated from trees, shrubs, and nonwoody plants including bulbs and vegetables, with newly recorded hosts listed herein. A. mellea was associated with infections of multiple hosts, and with all infections of the most common host, Ligustrum. In sites where more than one Armillaria species was found, the combination was of A. mellea and A. gallica, raising questions regarding the interactions of these species in U.K. gardens.
    Type of Medium: Online Resource
    ISSN: 0191-2917 , 1943-7692
    Language: English
    Publisher: Scientific Societies
    Publication Date: 2017
    detail.hit.zdb_id: 2042679-3
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  • 4
    Online Resource
    Online Resource
    Scientific Societies ; 2020
    In:  Plant Disease Vol. 104, No. 2 ( 2020-02), p. 483-492
    In: Plant Disease, Scientific Societies, Vol. 104, No. 2 ( 2020-02), p. 483-492
    Abstract: Armillaria root rot (ARR) is a serious disease of woody plants caused by several species of Armillaria. Armillaria isolates from diagnostic samples received in 2017 were identified by genus- and species-specific PCR and compared with isolates from an earlier survey (2004 to 2007). The results were comparable and, therefore, were combined for further analysis. Three species were identified: Armillaria mellea (83%), A. gallica (15%), and A. ostoyae (2%). Their wide host range makes choice of resistant plants in management of the disease difficult. We used the Royal Horticultural Society diagnostic dataset of ARR records from U.K. gardens to compare the susceptibility of different host genera to the disease. The dataset was compared with an earlier experiment at the University of California. An index-based approach was used to separate genera into three categories: 77 low-index ( 〈 0.99), 37 medium-index (0.99 to 1.76), and 56 high-index ( 〉 1.76) genera were recorded. All three species were associated with both angiosperms and gymnosperms; moreover, A. ostoyae did not show the host preference for gymnosperms that has been reported elsewhere. A. gallica was particularly common on herbaceous perennials and showed a trend to occur on resistant hosts that may be under other stress, supporting its description as an opportunistic pathogen. Four monocotyledons grown as trees or shrubs in U.K. gardens had a very low ARR index according to indices associated with A. mellea and A. ostoyae. Genera in the order Myrtales were almost always low index, while those in the Saxifragales and Fagales were mostly high index. These results provide confidence in the use of host resistance as part of the integrated management of ARR.
    Type of Medium: Online Resource
    ISSN: 0191-2917 , 1943-7692
    Language: English
    Publisher: Scientific Societies
    Publication Date: 2020
    detail.hit.zdb_id: 2042679-3
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  • 5
    In: Toxins, MDPI AG, Vol. 8, No. 12 ( 2016-11-30), p. 353-
    Type of Medium: Online Resource
    ISSN: 2072-6651
    Language: English
    Publisher: MDPI AG
    Publication Date: 2016
    detail.hit.zdb_id: 2518395-3
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  • 6
    In: NeoBiota, Pensoft Publishers, Vol. 58 ( 2020-07-10), p. 107-127
    Abstract: The world’s forests have never been more threatened by invasions of exotic pests and pathogens, whose causes and impacts are reinforced by global change. However, forest entomologists and pathologists have, for too long, worked independently, used different concepts and proposed specific management methods without recognising parallels and synergies between their respective fields. Instead, we advocate increased collaboration between these two scientific communities to improve the long-term health of forests. Our arguments are that the pathways of entry of exotic pests and pathogens are often the same and that insects and fungi often coexist in the same affected trees. Innovative methods for preventing invasions, early detection and identification of non-native species, modelling of their impact and spread and prevention of damage by increasing the resistance of ecosystems can be shared for the management of both pests and diseases. We, therefore, make recommendations to foster this convergence, proposing in particular the development of interdisciplinary research programmes, the development of generic tools or methods for pest and pathogen management and capacity building for the education and training of students, managers, decision-makers and citizens concerned with forest health.
    Type of Medium: Online Resource
    ISSN: 1314-2488 , 1619-0033
    Language: Unknown
    Publisher: Pensoft Publishers
    Publication Date: 2020
    detail.hit.zdb_id: 2628537-X
    SSG: 21
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  • 7
    Online Resource
    Online Resource
    American Society for Microbiology ; 2016
    In:  Applied and Environmental Microbiology Vol. 82, No. 22 ( 2016-11-15), p. 6548-6556
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 82, No. 22 ( 2016-11-15), p. 6548-6556
    Abstract: Fusarium langsethiae is a fungal pathogen of cereal crops that is an increasing problem in northern Europe, but much of its epidemiology is poorly understood. The species produces the mycotoxins T-2 and HT-2, which are highly toxic. It was hypothesized that grain aphids, Sitobion avenae , may transmit F. langsethiae inoculum between wheat plants, and a series of transmission experiments and volatile chemical analyses was performed to test this. Manual translocation of aphids from inoculated to uninfected hosts resulted in pathogen DNA accumulation in hosts. However, the free movement of wingless aphids from infected to healthy plants did not. The addition of winged aphids reared on F. langsethiae -inoculated wheat seedlings to wheat plants also did not achieve successful pathogen transfer. While our data suggested that aphid transmission of the pathogen was not very efficient, we observed an increase in disease when aphids were present. After seedling inoculation, an increase in pathogen DNA accumulation in seedling leaves was observed upon treatment with aphids. Furthermore, the presence of aphids on wheat plants with F. langsethiae- inoculated ears not only led to a rise in the amount of F. langsethiae DNA in infected grain but also to an increase in the concentrations of T-2 and HT-2 toxins, with more than 3-fold higher toxin levels than diseased plants without aphids. This work highlights that aphids increase the susceptibility of wheat host plants to F. langsethiae and that aphid infestation is a risk factor for accumulating increased levels of T-2 and HT-2 in wheat products. IMPORTANCE Fusarium langsethiae is shown here to cause increased contamination levels of grain with toxins produced by fungus when aphids share the host plant. This effect has also recently been demonstrated with Fusarium graminearum , yet the two fungal species show stark differences in their effect on aphid populations. In both cases, aphids improve the ability of the pathogens to cause and initiate Fusarium head blight (FHB) disease in wheat, but F. langsethiae may be able to act as a dispersal agent. F. langsethiae contributes harmful toxins to wheat grain that need to be controlled, but as yet, its epidemiology is unresolved. This work reveals insights into the role aphids play in promoting the successful colonization of this species in wheat and the benefit of controlling aphid populations on crops that are at high risk of FHB.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    RVK:
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2016
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
    SSG: 12
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  • 8
    In: PLOS ONE, Public Library of Science (PLoS), Vol. 17, No. 8 ( 2022-8-1), p. e0271622-
    Abstract: Armillaria mellea is an important fungal pathogen worldwide, affecting a large number of hosts in the horticulture and forestry industries. Controlling A . mellea infection is expensive, labour intensive and time-consuming, so a new, environmentally friendly management solution is required. To this effect, endophytic Trichoderma species were studied as a potential protective agent for Armillaria root rot (ARR) in strawberry and privet plants. A collection of forty endophytic Trichoderma isolates were inoculated into strawberry ( Fragaria × ananassa ) plants and plant growth was monitored for two months, during which time Trichoderma treatment had no apparent effect. Trichoderma -colonised strawberry plants were then inoculated with A . mellea and after three months plants were assessed for A . mellea infection. There was considerable variation in ARR disease levels between plants inoculated with different Trichoderma spp. isolates, but seven isolates reduced ARR below the level of positive controls. These isolates were further tested for protective potential in Trichoderma -colonized privet ( Ligustrum vulgare ) plants where five Trichoderma spp. isolates, including two highly effective Trichoderma atrobrunneum isolates, were able to significantly reduce levels of disease. This study highlights the potential of plants pre-colonised with T . atrobrunneum for effective protection against A . mellea in two hosts from different plant families.
    Type of Medium: Online Resource
    ISSN: 1932-6203
    Language: English
    Publisher: Public Library of Science (PLoS)
    Publication Date: 2022
    detail.hit.zdb_id: 2267670-3
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