References of "Schiffers, Bruno"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailRisk Assessment of Florists Exposed to Pesticide Residues through Handling of Flowers and Preparing Bouquets
Toumi, Khaoula ULg; Laure, Joly; Vleminckx, Christiane et al

in International Journal of Environmental Research and Public Health (2017), 14(5)

Abstract: Flowers are frequently treated with pesticides and, as a result, florists handling daily a large number of flowers can be exposed to pesticide residues. A study was conducted among twenty ... [more ▼]

Abstract: Flowers are frequently treated with pesticides and, as a result, florists handling daily a large number of flowers can be exposed to pesticide residues. A study was conducted among twenty volunteer florists located in Namur Province and in the Brussels Capital Region of Belgium in order to assess their potential dermal exposure to dislodgeable pesticide residues transferred from flowers to hands. Two pairs of cotton gloves were worn during two consecutive half days while handling flowers and preparing bouquets (from min 2 h to max 3 h/day). The residual pesticide deposits on the glove samples were extracted with a multi-residue Quick Easy Cheap Effective Rugged Safe (QuEChERS) method and analyzed by a combination of gas and liquid chromatography tandem mass spectrometry (GC-MS/MS and LC-MS/MS) by an accredited laboratory. A total of 111 active substances (mainly insecticides and fungicides) were detected, with an average of 37 active substances per sample and a total concentration per glove sample of 22.22 mg/kg. Several predictive levels of contamination were considered to assess the risk. The potential dermal exposures (PDE) of florists were estimated at the average, for different percentiles, and at the maximum concentration of residues in samples. At the PDE P90 and at the PDEMAX (or worst case) values, three and five active substances respectively exceed the Acceptable Operator Exposure Level (AOEL), indicating risk situations. For the systemic exposure (SE), one active substance (clofentezine) exceeds the AOEL at the P90 predictive level. In the worst case, SEMAX (at the maximum concentrations), four active substances (clofentezine, famoxadone, methiocarb, and pyridaben) exceed their respective AOEL values. Among the 14 most frequently detected active substances, two have SEMAX values exceeding the AOEL. Exposure could be particularly critical for clofentezine with an SEMAX value four times higher than the AOEL (393%). The exposure of florists appeared to be an example of a unique professional situation in which workers are exposed regularly to both a very high number of toxic chemicals and rather high concentration levels. Therefore the priority should be to raise the level of awareness among the florists who must change their habits and practices if they want to minimize their exposure. [less ▲]

Detailed reference viewed: 24 (2 ULg)
Full Text
Peer Reviewed
See detailA survey of pesticide residues in cut flowers from various countries
Toumi, Khaoula ULg; Vleminckx, Christiane; Van Loco, Joris et al

in Communications in Agricultural and Applied Biological Sciences (2016), 81(3), 493-502

As in any intensive culture, flowers require the use of a wide range of pesticides to control diseases and pests which can damage production and marketability. In order to evaluate the average levels of ... [more ▼]

As in any intensive culture, flowers require the use of a wide range of pesticides to control diseases and pests which can damage production and marketability. In order to evaluate the average levels of contamination of the cut flowers and to assess the risk for professionals exposed to pesticide residues when handling cut flowers, a survey was carried out with a group of florists from the Belgian largest cities. Fifty samples of roses (5 stems per bouquet) were collected: 45 bouquets were sampled in the 7 largest cities of Belgium (Antwerp, Brussels, Charleroi, Ghent, Leuven, Liege and Namur) and 5 were sampled from 5 supermarkets. Analysis of residual pesticide deposit is made by combining two multi-residue methods (GC-MS-MS and LC-MS-MS) in a laboratory accredited for pesticide residues. For all the samples analysed, a total of 97 active substances were detected, i.e. an average of 14 active substances per bouquet and a total average pesticide load of 26,03 mg/kg per flower sample. Most active substances (a.s.) reached high levels of residues, with concentrations between 10 and 50 mg/kg. Samples from Belgium and The Netherlands have a lower average number of a.s./sample, but the amount of residues is about the same in all samples (20-30 mg/kg) whatever the country of origin , except for the sample from Germany who is the worst case (22 a.s. with a total amount of 92 mg/kg). Most of the detected active substances are fungicides (dodemorph, spiroxamine, cyprodinil, fluopyram, pyrimethanil, benomyl (carbendazim), propamocarb, boscalid and iprodione) which are present on more than 20 of the 50 samples. All of them have a dermal acute toxicity. Consequently, florists who handle a large number of flowers are exposed daily with a potential effect on their health. [less ▲]

Detailed reference viewed: 17 (1 ULg)
Full Text
Peer Reviewed
See detailPesticide Residues on Three Cut Flower Species and Potential Exposure of Florists in Belgium
Toumi, Khaoula ULg; Vleminckx, Christiane; van Loco, Joris et al

in International Journal of Environmental Research and Public Health (2016), 13(10), 943-957

In order to assess the prevalence of pesticide contamination and the risk of florists’ exposure when handling cut flowers, sampling and analysis of 90 bouquets of the most commonly sold cut flowers in ... [more ▼]

In order to assess the prevalence of pesticide contamination and the risk of florists’ exposure when handling cut flowers, sampling and analysis of 90 bouquets of the most commonly sold cut flowers in Belgium (50 bouquets of roses; 20 of gerberas, and 20 of chrysanthemums) were carried out. The bouquets were collected from 50 florists located in the seven largest cities of Belgium (Antwerp, Brussels, Charleroi, Ghent, Leuven, Liege, and Namur) and from five supermarkets located in the different regions. To have a better understanding of the route of exposure and professional practices a questionnaire was also addressed to a group of 25 florists who volunteered to take part in the survey. All florists were interviewed individually when collecting the questionnaire. The residual pesticide deposit values on cut flowers were determined in an accredited laboratory using a multi-residue (QuEChERS Quick Easy Cheap Effective Rugged Safe) method and a combination of gas chromatography (GC) and liquid chormatograhphy (LC) analysis. A total of 107 active substances were detected from all samples; i.e., an average of about 10 active substances per bouquet. The most severely contaminated bouquet accumulated a total concentration of residues up to 97 mg/kg. Results show that roses are the most contaminated cut flowers; with an average of 14 substances detected per sample and a total concentration per rose sample of 26 mg/kg. Some active substances present an acute toxicity (acephate, methiocarb, monocrotophos, methomyl, deltamethrin, etc.) and exposure can generate a direct effect on the nervous system of florists. Nevertheless, fungicides (dodemorph, propamocarb, and procymidone) were the most frequently detected in samples and had the highest maximum concentrations out of all the active substances analysed. Dodemorph was the most frequently detected substance with the highest maximum concentration (41.9 mg/kg) measured in the rose samples. It appears from the survey that, despite being exposed to high deposits of residues, florists usually do not protect themselves from contact with residues even if they spend several hours handling cut flowers and preparing bouquets (from 2 to 6 h/day, depending on the time of year and/or selling periods) daily. Bad habits (eating, drinking, or smoking at work) and absence of personal protective equipment of most florists also increase the risk of contact with pesticide residues. [less ▲]

Detailed reference viewed: 27 (6 ULg)
Full Text
Peer Reviewed
See detailÉtude des potentialités des systèmes d’application contrôlée des gouttes (CDA) pour les traitements phytosanitaires en céréaliculture (synthèse bibliographique)
Ouled Taleb Salah, Sofiene ULg; De Cock, Nicolas ULg; Massinon, Mathieu ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment (2016)

Introduction. L’application contrôlée des gouttes (CDA) présente le double avantage de réduire à la fois l’étendue de la distribution des tailles des gouttes et le volume appliqué par rapport aux buses ... [more ▼]

Introduction. L’application contrôlée des gouttes (CDA) présente le double avantage de réduire à la fois l’étendue de la distribution des tailles des gouttes et le volume appliqué par rapport aux buses hydrauliques conventionnelles. Littérature. Cette revue investigue la potentialité de la CDA par rapport aux buses hydrauliques dans le cadre du désherbage précoce des adventices (2-3 feuilles). En termes de rétention, les études reliant les caractéristiques des gouttes (taille, vitesse et direction) et l’architecture, la densité et la mouillabilité du feuillage, en fonction de la formulation de bouillies, ont été abordées. Ces études montrent que des gouttes de 300 μm avec un adjuvant approprié et des jets émis 60° vers l’avant par rapport à la verticale contribuent à l’augmentation de la rétention sur les cibles problématiques à port dressé. L’effet des réductions des volumes d’application pour ces deux techniques est étudié sur base de la moyenne, du coefficient de variation et du taux de couverture des dépôts. Néanmoins, les résultats de ces études ne peuvent être généralisés du fait des différences de réglages opératoires entre les deux techniques d’application. Quant à la dérive, les atomiseurs CDA orientés horizontalement présentent un potentiel de dérive plus important que les buses hydrauliques pour lesquelles le spray est orienté vers le bas. La dérive augmente avec la vitesse du vent et diminue lorsque le diamètre médian volumétrique (DV50) augmente. Conclusions. De nouveaux réglages des atomiseurs de la CDA en termes de DV50 et de direction du jet peuvent répondre aux défis de l’agriculture de précision. Les pistes d’innovations proposées sont d’une part une amélioration de la résistance à l’usure des dents situées en bordure des disques et, d’autre part, une distribution granulométrique plus étroite. [less ▲]

Detailed reference viewed: 75 (23 ULg)
Full Text
Peer Reviewed
See detailDrift potential of tilted shielded rotary atomisers based on wind tunnel measurements
Ouled Taleb Salah, Sofiene ULg; Massinon, Mathieu ULg; De Cock, Nicolas ULg et al

in 67th International Symposium on Crop Protection (2015, May 19)

Detailed reference viewed: 47 (12 ULg)
Full Text
Peer Reviewed
See detailDrift of tilted shielded rotary atomisers based on wind tunnel measurements
Ouled Taleb Salah, Sofiene ULg; Massinon, Mathieu ULg; De Cock, Nicolas ULg et al

in Proceedings of International Symposium on Crop Protection Ghent 2015 (2015)

Detailed reference viewed: 25 (7 ULg)
Full Text
See detailOptimisation de la rétention des produits phytosanitaires sur une surface superhydrophobe
Ouled Taleb Salah, Sofiene ULg; Massinon, Mathieu ULg; Schiffers, Bruno ULg et al

in Journée Nationale sur la valorisation des Résultats de la Recherche dans le Domaine des Grandes Cultures (2014, April 17)

La protection des cultures est principalement réalisée en Tunisie par l’application de bouillies phytosanitaires à base d’eau. Au niveau de l’impact des gouttes sur le feuillage, trois types de ... [more ▼]

La protection des cultures est principalement réalisée en Tunisie par l’application de bouillies phytosanitaires à base d’eau. Au niveau de l’impact des gouttes sur le feuillage, trois types de comportement sont observés, à savoir l’adhésion, le rebond et la fragmentation. Ces types d’impact affectent la rétention par le feuillage et dépendent de la taille et de la vitesse des gouttes, des propriétés physico-chimiques de la bouillie et de la mouillabilité des surfaces foliaires. Une technique d’imagerie rapide a permis d’évaluer la pertinence de l’utilisation d’adjuvants tensio-actifs en vue d’améliorer la rétention en agissant sur le type d’impact. Des essais de rétention sur feuilles de vulpin, surface très peu mouillables ou superhydrophobe, montrent que l’ajout d’un adjuvant 0,1 %v/v dans l’eau contribue à l’amélioration des dépôts. La proportion d’adhésion a augmenté alors que celle du rebond a diminué. Cette technique en laboratoire est un outil efficace pour évaluer les pratiques culturales des agriculteurs et de fournir des conseils et recommandations pratiques en fonction des cibles. [less ▲]

Detailed reference viewed: 40 (6 ULg)
Peer Reviewed
See detailChapitre 9. Retour d’expérience. Institutions internationales - Chap. 9.4. Approche opérationnelle du PIP dans le soutien des petits producteurs africains face aux standards privés
STINGLHAMBER, Guy; Schiffers, Bruno ULg

in HAMMOUDI, Abdelhakim; GRAZIA, Cristina; SURRY, Yves (Eds.) Sécurité sanitaire des aliments : Régulation, analyses économiques et retours d'expérience (2014)

Les crises sanitaires de ces dernières années (E. coli, vache folle, poulet à la dioxine) ont fait prendre conscience de façon particulièrement violente des dangers liés à un développement non maîtrisé de ... [more ▼]

Les crises sanitaires de ces dernières années (E. coli, vache folle, poulet à la dioxine) ont fait prendre conscience de façon particulièrement violente des dangers liés à un développement non maîtrisé de systèmes agricoles intensifs et fortement industrialisés. L’évolution de la régulation au niveau international se heurte cependant à la difficulté de concilier, d’une part, l’efficacité des mesures sur le plan sanitaire et, d’autre part, l’assurance d’un bon fonctionnement de l’activité économique. Cet ouvrage propose un état des lieux des démarches de sécurité des aliments existantes ainsi qu’une série d’analyses critiques sur les méthodes et les instruments de régulation utilisés aux niveaux national et international dans le contexte actuel de forte interdépendance des économies des pays en développement et des pays développés. Une des originalités de cet ouvrage consiste dans la mise en perspective d’analyses de chercheurs et des retours d’expérience de professionnels des deux hémisphères du globe et d’institutionnels directement concernés par la question. Sécurité sanitaire des aliments s’adresse à tous les acteurs de l’agroalimentaire qu’ils soient étudiants, industriels ou chercheurs. [less ▲]

Detailed reference viewed: 35 (3 ULg)
Full Text
Peer Reviewed
See detailUse of rotary atomiser to optimize retention on barley leaves while reducing driftable droplets
Ouled Taleb Salah, Sofiene ULg; Massinon, Mathieu ULg; Boukhalfa, Hassina dite Hafida ULg et al

in International Advances in Pesticide Application, Aspects of Applied Biology 122 (2014, January)

Controlled Droplet Application using rotary atomiser is based on an improved control of droplet size and trajectory comparatively to hydraulic nozzles. On the basis of literature, it was stated that the ... [more ▼]

Controlled Droplet Application using rotary atomiser is based on an improved control of droplet size and trajectory comparatively to hydraulic nozzles. On the basis of literature, it was stated that the use of 60° forward angled spray combined with the narrow drop size distribution of a rotary atomiser could lead to low drift and high retention on monocotyledonous and superhydrophobic weeds at early stage. A Micromax120 atomiser was tuned to emit 270 µm VMD, 60° angled forward, to increase interception by the canopy structure. A spray mixture containing a superspreader adjuvant was used to avoid drop bouncing. An increase of spray retention comparatively to a Teejet 11002 at 1.4 bars was observed, although not proved statistically significant by these preliminary trials. On the drift side, the tilted spinning disc seemed to be advantageous since droplet spectra contains a low percentage of droplets under 100 µm and presents an ejection velocity of 25 m.s-1 at 5000 RPM. The spray drift was reduced about 50%. However, these setting were not found as efficient as expected. Indeed, angled spray proved to be more sensitive to advection and turbulence, as the spray was more exposed to the airflow than for the vertical position. It appears that angling the spray and choosing a drop size spectrum with a Volume Median Diameter as big as 270 µm is not sufficient to reduce significantly this issue. Some alternatives as decreasing the emission height are possible with angled sprays but require height control that seems difficult to reach in practical situations. [less ▲]

Detailed reference viewed: 106 (29 ULg)
Full Text
Peer Reviewed
See detailMeasuring the general phytosanitary situation: development of a plant health barometer
Wilmart, Olivier; Van Huffel, Xavier; Diricks, Herman et al

in European Journal of Plant Pathology (2014), Online First Articles

The development of a plant health barometer, an instrument to measure the general phytosanitary situation on a national level (Belgium) and on a yearly basis and to monitor its evolution over time, is ... [more ▼]

The development of a plant health barometer, an instrument to measure the general phytosanitary situation on a national level (Belgium) and on a yearly basis and to monitor its evolution over time, is described. The elaboration of a set of 13 plant health indicators (PHI’s) as the basis for the plant health barometer is discussed. These indicators were weighted by experts - including scientists, policy makers and agroindustrial representatives - to determine their relative impact in the barometer. The result of the barometer is expressed as a comparison with the previous year. Based on the results of the 13 PHI’s, it is concluded that the general plant health in Belgium shows a positive evolution from 2007 until 2010 and a negative evolution from 2010 until 2012. The plant health barometer provides a overview of the phytosanitary situation of plants and plant products in Belgium and is a tool to communicate in an intelligible, comprehensible manner on aspects of plant health to consumers and professional stakeholders in the plant production chain. Together with the food safety barometer and the animal health barometer, the plant health barometer is one of the three instruments to provide a overview on the general status of the safety of the food chain in Belgium. [less ▲]

Detailed reference viewed: 34 (2 ULg)
Full Text
Peer Reviewed
See detailEffects of a commercial formulation of a plant resistance elicitor on non-target organisms
Jansen, Jean-Pierre; Buenotesta, Raphaël; Schiffers, Bruno ULg

in Bulletin OILB/SROP = IOBC/WPRS Bulletin (2014), 103

The toxicity of Fyto11, a plant resistance elicitor commercial formulation used to increase the natural resistance of Cucurbitaceae (cucumber, zucchini and melon) and Solanaceae (tomato and sweet pepper ... [more ▼]

The toxicity of Fyto11, a plant resistance elicitor commercial formulation used to increase the natural resistance of Cucurbitaceae (cucumber, zucchini and melon) and Solanaceae (tomato and sweet pepper) against powdery mildew under greenhouse conditions, has been assessed on several beneficial arthropods: the honeybee Apis mellifera, the predatory miteTyphlodromus pyri, the aphid parasitic wasp Aphidius rhopalosiphi and the aphid predator Episyrphus balteatus. Tested at 0.5% and 1.0% spray dilution on plants, Fyto11 did not lead to significant corrected mortalities for E. balteatus larvae and adult wasps of A. rhopalosiphi, with a maximum of 5.4% mortality. No effects on reproduction capacity of the parasitic wasps were observed. The exposure of T. pyri protonymphs to Fyto11 on glass plates lead to corrected mortalities of 1.1% and 32.6% at 0.5% and 1.0% and to a reduction of female fertility of 9.0% and 25.4%, compared to the control performance. When assessed on the honeybee by contact and oral exposure, Fyto11 did not lead to significant effects, with LD50 estimated as > 10 μg a.i./bee (oral) and 12.5 μg a.i./bee (contact), leading to HQ ratio < 50 and classifying the product at no or low risk for honeybees. These results showed that the product was harmless for all beneficials at the proposed commercial rate, except for T. pyri at 1.0% on glass plates, where the product was rated as slightly harmful. Even if all the beneficial species’ diversity has not been assessed with this product, negative effects on non-target organisms are not expected in field conditions and Fyto11 can be considered as compatible with IPM programs. [less ▲]

Detailed reference viewed: 89 (2 ULg)
Full Text
Peer Reviewed
See detailMeasuring the general phytosanitary situation: development of a plant health barometer
Wilmart, Olivier; Van Huffel, X.; Diricks, H. et al

Poster (2014)

Objective: measuring and monitoring the yearly evolution of the general plant health (phytosanitary situation) of plants and plant products in Belgium in an objective manner, and communicating about it in ... [more ▼]

Objective: measuring and monitoring the yearly evolution of the general plant health (phytosanitary situation) of plants and plant products in Belgium in an objective manner, and communicating about it in a comprehensive way. [less ▲]

Detailed reference viewed: 22 (3 ULg)
Full Text
Peer Reviewed
See detailA new oil-based formulation of Trichoderma asperellum for the biological control of cacao black pod disease caused by Phytophthora megakarya
Mbarga, J.B.; Begoude, B.A.D.; Ambang, Z. et al

in Biological Control (2014), 77

In African cacao-producing countries, control of cacao black pod disease caused by hytophthora megakarya is a priority. Introducing biological control agents as part of a P. megakarya control strategy is ... [more ▼]

In African cacao-producing countries, control of cacao black pod disease caused by hytophthora megakarya is a priority. Introducing biological control agents as part of a P. megakarya control strategy is highly desirable, especially in a perspective of pesticide reduction. Trichoderma species are among the most used biological control agents. In Cameroon, Trichoderma asperellum formulated in wettable powder has produced positive effects against this disease. However, with this type of formulation, shelf-life and persistence of conidia on pods are limited. Our study therefore sought to develop a new T. asperellum formulation that would be more effective and better suited to the conditions of field application by small-scale producers in Cameroon. We selected a soybean oil-based oil dispersion, in which the half-life of the conidia reached 22.5 weeks, versus 5 weeks in aqueous suspension. Tested on detached pods, the formulation completely inhibited the development of the disease. When sprayed in the field on cacao clones highly sensitive to P. megakarya, the formulation resulted in 90% protection of treated pods after 1 week, and 50% after 3.2 weeks. The formulations exercised a measurable effect for up to 7 weeks, versus 2 weeks in the case of an aqueous conidial suspension and 5 weeks for that of a conventional fungicide (Kocide). Trichoderma asperellum formulated in oil dispersion has therefore great potential for the control of cacao black pod disease with less recourse to synthetic fungicides. [less ▲]

Detailed reference viewed: 85 (4 ULg)
Full Text
See detaileLearning COLEACP : un dispositif de formation au service des professionnels du secteur agricole en Afrique
Prunier, Emmanuelle; Le Hung, Florian; Schiffers, Bruno ULg

in ELearning Africa 2014 - Book of Abstracts (2014)

Le dispositif de formation à distance du COLEACP (Comité de Liaison Europe-Afrique-Caraïbes-Pacifique) est une composante d'un système complet de formation dédié au renforcement des capacités des ... [more ▼]

Le dispositif de formation à distance du COLEACP (Comité de Liaison Europe-Afrique-Caraïbes-Pacifique) est une composante d'un système complet de formation dédié au renforcement des capacités des opérateurs des filières agricoles des pays ACP (Afrique Caraïbes et Pacifique). [less ▲]

Detailed reference viewed: 84 (5 ULg)
Full Text
Peer Reviewed
See detailChapitre 9. Retour d'expériences : institutions internationales. Partie 9.4.: Approche opérationnelle du PIP dans le soutien des petits producteurs africains face aux standards privés
Schiffers, Bruno ULg; Stinglhamber, Guy

in Hammoudi, Abdelhakim; Grazia, Cristina; Surry, Yves (Eds.) et al Sécurité sanitaires des aliments (2014)

Detailed reference viewed: 14 (5 ULg)
Full Text
See detailDossier Formation : Le Fair Training System
Schiffers, Bruno ULg

in Horizons - Le magazine d'information du Coleacp et de ses programmes PIP et EDES (2013), 1

Detailed reference viewed: 19 (2 ULg)
Full Text
See detailL'emploi des pesticides dans les cultures : entre tracteurs et détracteurs
Schiffers, Bruno ULg

in Probio-Revue (2012), 2

Detailed reference viewed: 65 (11 ULg)
Full Text
Peer Reviewed
See detailAssessment of the risk of dermal exposure to pesticide during treatment with a back-pack sprayer in the presence and absence of vegetation
Kadri, Z.; Sylla, S.; Lebeau, Frédéric ULg et al

in Communications in Agricultural and Applied Biological Sciences (2012), 77(7), 415-422

Detailed reference viewed: 33 (3 ULg)
Full Text
Peer Reviewed
See detailEfficacy of Trichoderma asperellum oil formulations on the control of Cocoa Black Pod Disease (Phytophthora megakarya)
Mbarga, J.B.; Martijn Ten Hoopen, G.; Begoude, A.D. et al

in Communications in Agricultural and Applied Biological Sciences (2012), 77(3), 65-74

Detailed reference viewed: 63 (3 ULg)