31 Result(s)
within
Lucien Hoffmann
Life Sciences
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Article
Open AccessWhitefly endosymbionts: IPM opportunity or tilting at windmills?
Whiteflies are sap-sucking insects responsible for high economic losses. They colonize hundreds of plant species and cause direct feeding damage and indirect damage through transmission of devastating viruses....
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Article
Enhancing septoria leaf blotch forecasts in winter wheat I: the effect of temperature on the temporal distance between critical rainfall periods and the breaking of the control threshold
In integrated pest management (IPM), pests are controlled when the costs of control correspond with the damage caused by a pest on a monetary scale, implying that low pest levels are left uncontrolled. Several...
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Article
Open AccessEnhancing septoria leaf blotch forecasts in winter wheat II: model architecture and validation results
In precision agriculture, pesticides and other inputs shall be used precisely when (and where) they are needed. European Directive 2009/128/EC calls for respecting the principles of integrated pest management ...
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Article
Atomic force microscopy (AFM) application to diatom study: review and perspectives
Atomic force microscopy (AFM) allows high image resolution, based on slight differences in surface height and on imaging transparent structures, thus, is an excellent type of microscopy for imaging nano-sized ...
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Article
Composition and evaluation of a novel web-based decision support system for grape black rot control
Black rot on grapevine is a fungal disease caused by Phyllosticta ampelicida (syn. Guignardia bidwellii) affecting grape leaves as well as clusters. A novel black rot decision support system termed VitiMeteo Blac...
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Chapter and Conference Paper
Intrauterine treated lambs as a model for the study of Intrauterine Growth Restriction (IUGR) and consequent metabolic disorders
Developmental exposure to environmental and therapeutic chemicals, including excess androgens, has been reported to induce Intrauterine Growth Restriction (IUGR) and abnormal post-natal growth. It has now been...
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Article
Are diatom diversity indices reliable monitoring metrics?
A biological survey was carried out in 640 stations spread over the Loire-Bretagne National Network (France) between 1996 and 2000. Epilithic diatom inventories were obtained following standard methods. A tota...
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Article
Preface: Use of algae for monitoring rivers
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Article
Alpine freshwater ecosystems in a protected area: a source of diatom diversity
The “All Taxa Biodiversity Inventories” (ATBIs) project coordinated by the European Distributed Institute of Taxonomy (EDIT) aims to achieve a baseline biodiversity assessment of flora and fauna in those regio...
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Article
Ecological assessment of Portuguese reservoirs based on littoral epilithic diatoms
The objective of this study was to evaluate whether biological methods based on epilithic littoral diatoms are a valuable complement to other biological elements for the assessment of the ecological potential ...
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Article
Fractal dimension and shape parameters of asexual Fusarium spores from selected species: Which species can be distinguished?
Fungi of the genus Fusarium are prominent plant pathogens producing various toxic secondary metabolites. Digital microscopic images were taken from the asexual spores of Fusarium avenaceum, F. cerealis, F. culmor...
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Article
Carbohydrate metabolism and cell protection mechanisms differentiate drought tolerance and sensitivity in advanced potato clones (Solanum tuberosum L.)
In potatoes and many other crops, drought is one of the most important environmental constraints leading to yield loss. Development of drought-tolerant cultivars is therefore required for maintaining yields un...
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Article
A note on the insecticide sensitivity status of Meligethes species (Coleoptera: Nitidulidae) in Luxembourg
Adult pollen beetles, Meligethes spp. (Coleoptera: Nitidulidae), were sampled from 27 and 35 oilseed rape (Brassica napus subsp. oleifera) fields scattered over Luxembourg in 2008 and 2009, respectively. Ten well...
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Article
Evidence for natural resistance towards trifloxystrobin in Fusarium graminearum
A collection of 55 Fusarium graminearum (Gibberella zeae) strains isolated between 1969 and 2009 in Belgium, Canada, Germany, Italy, Luxembourg, or the USA belonging to the three known chemotypes (3-acetylated de...
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Article
Monitoring gene expression of potato under salinity using cDNA microarrays
The molecular response to salt exposure was studied in the leaves of a Solanum tuberosum clone using cDNA microarray. Differentially expressed genes were classified according to their known or predicted function ...
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Article
Diatom teratological forms and environmental alterations: a review
The foremost feature of a diatom is the species-specific ornamentation of the silicon cell wall, which is preserved and faithfully reproduced through the generations. If exposed to different kinds of stress du...
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Article
Ecophysiological responses of nine floodplain meadow species to changing hydrological conditions
Here, we investigated how species from different floodplain meadow plant communities differ in their ecophysiological responses to an abrupt change in hydrological conditions. We simulated two contrasting hydr...
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Chapter
Ecophysiological responses of nine floodplain meadow species to changing hydrological conditions
Here, we investigated how species from different floodplain meadow plant communities differ in their ecophysiological responses to an abrupt change in hydrological conditions. We simulated two contrasting hydr...
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Article
Spatio-temporal Patterns of Protozoan Communities in a Meso-eutrophic Reservoir (Esch-sur-Sûre, Luxembourg)
The spatio-temporal distribution of the heterotrophic nanoflagellates (HNF) and ciliates was monitored in the reservoir of Esch-sur-Sûre during the year 1999. Three main periods of protozoan development were o...
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Article
A Top-down Approach for the Development of a Stream Typology Based on Abiotic Variables
The management of aquatic ecosystems requires stream-type specific assessment systems, which enable the partition of natural spatial variability and consequently an optimisation of monitoring and assessment pr...
