References of "Schiffers, Bruno"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailBuilding a selectivity list of plant protection products on beneficial arthropods in open field: a clear example with potato crop.
Hautier, Louis; Jansen, Jean-Pierre; Mabon, Nicolas et al

in Bulletin OILB/SROP = IOBC/WPRS Bulletin (2006), 29(10), 21-32

Detailed reference viewed: 64 (9 ULg)
Full Text
Peer Reviewed
See detailExperimental evaluation of a spray drift Gaussian tilting plume model.
Stainier, Charles; Robaye, Vincent ULg; Destain, Marie-France ULg et al

in Aspects of Applied Biology (2006), 77(2), 365-370

This paper evaluates the application of a Gaussian tilting plume model to study agricultural spraying drift. The spray drift deposit of each droplet diameter class, measured by a laser particle analyser ... [more ▼]

This paper evaluates the application of a Gaussian tilting plume model to study agricultural spraying drift. The spray drift deposit of each droplet diameter class, measured by a laser particle analyser, is computed independently and summed to give footprint results for different nozzle. The methodology is used to model the drift from a fiat fan nozzle operating in a wind tunnel. Discrepancies with experimental data and the potential for further improvement of this approach are discussed. [less ▲]

Detailed reference viewed: 52 (13 ULg)
Full Text
See detailEffect of the entrained air and initial droplet velocity on the release height parameter of a Gaussian spray drift model.
Stainier, C.; Destain, Marie-France ULg; Schiffers, Bruno ULg et al

in Communications in Agricultural and Applied Biological Sciences (2006), 71(2 Pt A),

The increased concern about environmental effect of off-target deposits of pesticides use has resulted in the development of numerous spray drift models. Statistical models based on experimental field ... [more ▼]

The increased concern about environmental effect of off-target deposits of pesticides use has resulted in the development of numerous spray drift models. Statistical models based on experimental field studies are used to estimate off-target deposits for different sprayers in various environmental conditions. Random-walk and computational fluid dynamics (CFD) models have been used to predict the effect of operational parameters and were extensively validated in wind tunnel. A third group, Gaussian dispersion models have been used for several years for the environmental assessment of the pesticide spray drift, mainly for aerial application. When these models were used for the evaluation of boom sprayer spray drift, their predictions were found unreliable in the short range, were the initial release conditions of the droplets have a significant effect on the spray deposits. For longer ranges, the results were found consistent with the field measurements as the characteristics of the source have a reduced influence on the small droplets drift. Three major parameters must be taken into account in order to define realistic initial conditions of the droplets in a spray drift model: the spray pattern of the nozzle, the boom movements and the effect of entrained air and droplet velocities. To take theses parameters into account in a Gaussian model, the nozzle droplet size distribution measured with a Malvern laser particle analyser was used to divide the nozzle output into several size classes. The spray deposits of each diameter class was computed for each successive position of the nozzle combining the nozzle spray distribution with drift computed with a Gaussian tilting plume model. The summation of these footprints resulted in the global drift of the nozzle. For increasing droplet size, the release height used in the Gaussian model was decreased from nozzle height to ground level using an experimental law to take into account the effect of entrained air and droplet initial velocity. The experimental law was adjusted on 2m/s wind tunnel measurements and robustness was evaluated for 1 and 4 m/s. [less ▲]

Detailed reference viewed: 59 (13 ULg)
Full Text
Peer Reviewed
See detailDroplet Size Spectra And Drift Effect Of Two Phenmedipham Formulations And Four Adjuvants Mixtures
Stainier, C.; Destain, Marie-France ULg; Schiffers, Bruno ULg et al

in Crop Protection (2006), 25(12),

Relative drift potential was evaluated for three types of hydraulic nozzles (a flat-fan nozzle, a hollow cone nozzle and an air induction nozzle) spraying different liquids: water, emulsifiable ... [more ▼]

Relative drift potential was evaluated for three types of hydraulic nozzles (a flat-fan nozzle, a hollow cone nozzle and an air induction nozzle) spraying different liquids: water, emulsifiable concentrate (EC) and suspension concentrate (SC) formulations of phenmedipham dispersed in water, with or without addition of 4 different tank-mix adjuvants. The droplet size spectra were measured for these 15 spray mixtures using a Malvern Particle Sizer and characterised by the Volume Median Diameter (VMD) and the percentage of liquid contained in droplets less than 100 m (% < 100 m). Horizontal ground drift was measured in a wind tunnel, on glass fibre collectors using a fluorescent tracer dye technique. The relative drift of each spray mixture was characterised by the Drifted Part (DP) which is the part of the sprayed volume drifted between 2 and 6 metres. Although the nozzle type was the predominating parameter regarding to the droplet size spectra and the DP, differences were observed due to the liquids characteristics. The EC formulation produced a smaller droplet size and a greater DP than the SC formulation whatever the tank mix adjuvant used. For the different spray mixtures, the DP was poorly correlated to the VMD or the % < 100 m. However, correlations between the VMD, the % < 100 m and the DP of the flat-fan nozzle and of the hollow cone nozzle were significant. This suggests that a reference nozzle could be used to estimate the drift potential of other nozzle with a similar liquid sheet break-up mechanism. [less ▲]

Detailed reference viewed: 90 (16 ULg)
Full Text
Peer Reviewed
See detailThe PIP training programme: building of ACP experts capacities in crop protection and food safety to support local companies to comply with EU regulations on pesticides residues.
Schiffers, Bruno ULg; Schubert, Annick; Schiffers, Christophe ULg et al

in Communications in agricultural and applied biological sciences (2006), 71(2A), 39-48

Detailed reference viewed: 61 (17 ULg)
Full Text
Peer Reviewed
See detailModelling the spray drift by a modified Gaussian tilting plume model.
Stainier, Charles; Robaye, Vincent ULg; Schiffers, Bruno ULg et al

in Aspects of Applied Biology (2006), 77(2), 281-287

The increased concern about environmental effect of pesticides use has resulted in abundant research on spray drift. Spray drift modelling has been developed to get a better understanding of the ... [more ▼]

The increased concern about environmental effect of pesticides use has resulted in abundant research on spray drift. Spray drift modelling has been developed to get a better understanding of the parameters involved and better estimation of the off-target spray deposit. Two groups of models have received extensive a.ttention: Random-walk and computational fluid dynamics (CFD) models have been used to predict the effect of: nozzle height, spray pressure, wind speed,... and were v.alidated with wind tunnels trials. Statistical models based on field trials results have been developed to estimate off-target spray deposit for different sprayers in various environmental conditions. A third group, Gaussian dispersion models, have received early attention in spray drift modelling but are not so popular, despite their international success in environmental pollution modelling. The adaptation of such a model to ground spraying is proposed. The nozzle droplet size distribution measured with a Malvern laser particle analyser is used to divide the nozzle output into several size classes. The spray deposit (or footprint) of each diameter class is computed. The summation of these footprints results in the global drift of the nozzle. The methodology is applied to derive the drift of a.flat fan nozzle located in a wind tunnel and the potential of this approach is discussed. [less ▲]

Detailed reference viewed: 62 (10 ULg)
Full Text
See detailIMPACT DE L’EVOLUTION REGLEMENTAIRE EUROPEENNE SUR LES PRATIQUES AGRICOLES DES EXPORTATEURS ACP ET PROGRAMME DE FORMATION DES CADRES DES ENTREPRISES MIS EN PLACE POUR LE PROGRAMME PIP DU COLEACP
Schiffers, Bruno ULg

Conference (2005, November)

La succession des crises alimentaires a poussé les consommateurs européens à exiger toujours plus de garantie quant à la sécurité de l’alimentation destinée à l’homme et aux animaux d’élevage. La ... [more ▼]

La succession des crises alimentaires a poussé les consommateurs européens à exiger toujours plus de garantie quant à la sécurité de l’alimentation destinée à l’homme et aux animaux d’élevage. La législation européenne a, en conséquence, évolué rapidement et le niveau d’exigence s’est fortement accru, le principe de base étant pour le producteur, l’importateur et le distributeur de pouvoir prouver aux autorités compétentes que toutes les précautions ont été prises, qu’une traçabilité des produits entrant dans la chaîne alimentaire existe et que, en cas de problème avéré ou suspecté, une procédure de notification, de rappel ou de retrait a été prévue et mise en place. Pour les producteurs ACP, ces évolutions les ont conduit à devoir modifier dans l’urgence leurs pratiques. La réussite de la mise en conformité et la mise en pratique dans les entreprises d’une politique de management de la qualité a exigé un effort important de formation non seulement au niveau des managers, des cadres et du personnel des entreprises, mais aussi au niveau de tous les acteurs qui gravitent autour de la filière « fruits et légumes d’exportation ». Le PIP a développé un dispositif de formation basé sur la capitalisation de compétences chez les acteurs locaux : prestataires de services et formateurs ACP, cadres techniques intermédiaires, responsables de laboratoire, agents de l’état chargés du contrôle, etc. Commencées depuis 2003, les actions du PIP en faveur des entreprises ACP concernent à présent plus de 80% du tonnage des fruits et légumes frais (hors bananes) exportés vers l’Union européenne. [less ▲]

Detailed reference viewed: 38 (2 ULg)
Full Text
Peer Reviewed
See detailSelectivity lists of pesticides to beneficial arthropods for IPM programs in carrot--first results.
Hautier, L.; Jansen, J.-P.; Mabon, N. et al

in Communications in Agricultural and Applied Biological Sciences (2005, May 10), 70(4), 547-558

In order to improve IPM programs in carrot, 7 fungicides, 12 herbicides and 9 insecticides commonly used in Belgium were tested for their toxicity towards five beneficial arthropods representative of most ... [more ▼]

In order to improve IPM programs in carrot, 7 fungicides, 12 herbicides and 9 insecticides commonly used in Belgium were tested for their toxicity towards five beneficial arthropods representative of most important natural enemies encountered in carrot: parasitic wasps- Aphidius rhopalosiphi (De Stefani-Perez) (Hym., Aphidiidae), ladybirds - Adalia bipunctata (L.) (Col., Coccinellidae), hoverfly - Episyrphus balteatus (Dipt., Syrphidae), rove beetle - Aleochara bilineata (Col., Staphyllinidae) and carabid beetle - Bembidion lampros (col., Carabidae). [less ▲]

Detailed reference viewed: 58 (15 ULg)
Full Text
Peer Reviewed
See detailEffect of tank mixed adjuvants on the drift potential of phenmedipham formulations.
Stainier, Charles; Destain, Marie-France ULg; Schiffers, Bruno ULg et al

in Communications in agricultural and applied biological sciences (2005), 70(4), 979-987

Detailed reference viewed: 31 (13 ULg)
Full Text
See detailETUDE PAR IMAGERIE NUMERIQUE ET GRANULOMETRIE LASER DE L'INFLUENCE DE HUIT ADJUVANTS SUR LA FORMATION DU JET DE PULVERISATION POUR TROIS TYPES DE BUSES.
Stainier, Charles; Lebeau, Frédéric ULg; Straet, S. et al

Conference (2004, March 11)

The liquid sheet characteristics as a function of the adjuvant were measured using digital images. The droplet size distribution was measured using a Malvern particle size analyser. It appears that the ... [more ▼]

The liquid sheet characteristics as a function of the adjuvant were measured using digital images. The droplet size distribution was measured using a Malvern particle size analyser. It appears that the dynamical surface tension plays a critical role in the spray formation. Spray formulation containing Li-700, Silwet L-77, Flofix and Actirob are characterised by a lower dynamical surface tension than those containing Tensiofix D03, Trend 90, Frigate and Break-thru S240. For the three agricultural spray nozzles tested and in comparaison with pure water, the first group shortened the length of the liquid sheet before a perforation break-up mode when the second group lengthened it slightly before a wave disintegration break-up mode. The lengthening of the liquid sheet, is followed by a diminution of the VMD. [less ▲]

Detailed reference viewed: 215 (15 ULg)
See detailImpact de pesticides non agricoles sur les eaux superficielles
Culot, Marc ULg; Schiffers, Bruno ULg; Rung, J. et al

Poster (2004)

Detailed reference viewed: 16 (1 ULg)
Full Text
Peer Reviewed
See detailDrawing-up of pesticide selectivity lists to beneficial arthropods for IPM programmes in potato.
Hautier, L.; Jansen, J. P.; Schiffers, Bruno ULg et al

in Communications in agricultural and applied biological sciences (2004), 69(3), 171-182

In order to promote IPM programmes in potato, the toxicity of 19 fungicides, 4 herbicides and 11 insecticides commonly used in this crop in Belgium was assessed on three beneficial arthropods. These ... [more ▼]

In order to promote IPM programmes in potato, the toxicity of 19 fungicides, 4 herbicides and 11 insecticides commonly used in this crop in Belgium was assessed on three beneficial arthropods. These species were representative of the most important aphid specific natural enemies encountered in potatoes: a parasitic wasp--Aphidius rhopalosiphi (De Stefani-Perez) (Hym., Aphidiidae), a ladybird--Adalia bipunctata (L.) (Col., Coccinellidae) and a hoverfly--Episyrphus balteatus (Dipt., Syrphidae). In a first time, pesticides were tested on glass plates on A. rhopalosiphi adults and A. bipunctata and E. balteatus larvae. For each insect, products inducing corrected mortality (Mc) lower than 30% were directly classified in a positive list for harmless products (green list). The other compounds were further tested on plants and listed in toxicity classes according to mortalities induced during this extended laboratory test: harmless (Mc < 30%), slightly harmful (30% < Mc < 60%), moderately harmful (60% < Mc < 80%) and harmful (Mc > 80). A chemical determination of pesticides residues was also performed for each experiment in order to determine the exposure of beneficial arthropods to pesticide residues and to validate the application of chemicals on tested substrates. On the basis of the results of acute toxicity tests, the period of each pesticide use according to normal agricultural practices and the abundance and importance of the three different groups of aphid natural enemies at different periods of the year, four pesticides lists were built up. Each list corresponded to a different period of pesticides application: Period I--from seedling to beginning of June (based on A. rhopalosiphi tests), Period II--beginning to end of June (based on A. rhopalosiphi tests), Period III beginning to end of July (based on E. balteatus and A. bipunctata tests) and Period IV--August to harvest (no exposure of beneficials). Results showed that herbicides were not toxic to the three species and can be used according to normal agricultural practices without restrictions. All fungicides can also be used without restrictions at recommended rates. Only the mixture Metalaxyl-M + Fluazinam was slightly harmful to A. bipunctata but had no effects on A. rhopalosiphi and E. balteatus. Results were more contrasted for insecticides and none of them was totally selective for all the 3 beneficial arthropods. Therefore, they can only be used with restrictions at periods II and III, according to the beneficial species that need to be protected. [less ▲]

Detailed reference viewed: 13 (0 ULg)
Full Text
See detailUtilisation des pesticides dans le contexte de la production de fruits et légumes exportés
Schiffers, Bruno ULg

Scientific conference (2003, January)

Detailed reference viewed: 16 (0 ULg)
Full Text
See detailOrigine et impact des risques biologiques, physiques et chimiques
Samb, Babacar; Schiffers, Bruno ULg

in Proceedings Bio-Scope - Atelier "Responsable Assurance Qualité Totale" (2003)

La préservation de la santé des consommateurs est devenue une préoccupation majeure en ce début de nouveau millénaire marqué par le poids de la société civile en général et des ligues de consommateurs en ... [more ▼]

La préservation de la santé des consommateurs est devenue une préoccupation majeure en ce début de nouveau millénaire marqué par le poids de la société civile en général et des ligues de consommateurs en particulier. Les exigences en termes de qualité sanitaire et de traçabilité, qui figurent non seulement dans des réglementations toujours plus strictes mais aussi dans des référentiels de qualité ou des cahiers de charge imposés aux producteurs, traduisent la volonté des consommateurs européens de savoir où, comment et quand les aliments qu'ils ont dans leur assiette ont été produits. [less ▲]

Detailed reference viewed: 95 (6 ULg)
See detailCaractérisation de la résistance au Sénégal d'Helicoverpa armigera Hubner (Lépidoptère, Noctuidae) par bioessai et méthodes moléculaires
Moreira, Christine; Schiffers, Bruno ULg; Haubruge, Eric ULg

in AFPP - 6ème Conférence Internationale sur les Ravageurs en Agriculture (2002, December)

Detailed reference viewed: 23 (7 ULg)
Full Text
See detailEtablissement de listes de sélectivité de pesticides vis-à-vis de l'entomofaune utile dans le cadre de la production intégrée en grandes cultures
Schiffers, Bruno ULg; Deleu, Rodolphe; Viatour, N. et al

in AFPP - 6ème conférence Internationale sur les Ravageurs en Agriculture (2002, December)

Detailed reference viewed: 54 (13 ULg)
Full Text
See detailBases de la lutte phytosanitaire et des Bonnes Pratiques
Schiffers, Bruno ULg

in Normes de Qualité phytosanitaire dans le secteur des fruits et légumes (2002)

Detailed reference viewed: 15 (2 ULg)
Full Text
See detailCaractérisation de la résistance au Sénégal d'Helicoverpa armigera Hübner (Lépidoptère, Noctuidae) par bioessai et méthodes moléculaires
Moreira, Christine; Schiffers, Bruno ULg; Haubruge, Eric ULg

in Parasitica (2002), 58(2-3-4), 89-98

Un vial-test de détection de la résistance à la cyperméthrine d'Helicoverpa armigera a été vulgarisé (Programme PR-PRAO) en Afrique de l'Ouest (flacon en verre imprégné). Cette étude montre qu'à des ... [more ▼]

Un vial-test de détection de la résistance à la cyperméthrine d'Helicoverpa armigera a été vulgarisé (Programme PR-PRAO) en Afrique de l'Ouest (flacon en verre imprégné). Cette étude montre qu'à des températures de 30°C et 54°C, 4 pyréthrinoïdes et 2 organophosphorés se dégradent rapidement dans les flacons en verre. Un "kit" est présenté sous forme d'un papier filtre traité enveloppé dans une feuille d'aluminium. Il possède une bien meilleure stabilité au stockage (sur 50 jours). Des tests moléculaires, réalisés sur une souche d'H. armigera issue du Sénégal, révèlent deux mutations (la sérine remplacée par l'acide glutamique et l'acide aspartique par la valine) au niveau du gène codant pour le canal sodium voltage dépendant, cible principale des pyréthrinoïdes. [less ▲]

Detailed reference viewed: 41 (8 ULg)
See detailEvaluation du risque de toxicite de pesticides vis-a-vis de trois insectes auxiliaires (Adalia bipunctata, Aphidius rhopalosiphi et Episyrphus balteatus) par le dosage chimique des residus.
Copin, A.; Latteur, G.; Deleu, R. et al

Book published by Ministere des Classes Moyennes et de l'Agriculture, Service Information - Bibliotheque (2001)

Detailed reference viewed: 31 (10 ULg)
Full Text
Peer Reviewed
See detailEvaluation de l'efficacité de la lutte chimique contre Helicoverpa armigera sur le cotonnier durant la campagne agricole 1996 au Burkina Faso
Toé, A.M.; Héma, S.A.O.; Schiffers, Bruno ULg

in Etudes et Recherches Sahéliennes (2000), 4-5

ln 1996, the cotton subsector in Burkina Faso experienced a great crisis which was drama-like here and there. An exceptionally high infestation of cotton plants by the main pest, Helicoverpa armigera (a ... [more ▼]

ln 1996, the cotton subsector in Burkina Faso experienced a great crisis which was drama-like here and there. An exceptionally high infestation of cotton plants by the main pest, Helicoverpa armigera (a density of 167n500 worms par hectare) on treated plots whereas the theoretical intervention threshold is ranging from 5,000 to 12,500 Army-worms per hectare could not be controlled by the released insecticides. This year, the infestation intensity was at least sirnilar with the one of the year 1991 in which harvest losses had been estimated at 50,000 tons of seed cotton (NIBOUCHE 1994), i.e. a loss of about 20 billion francs CFA. The aftermath was really heavy for the productucers, SOFITEX and the Burkina state. Four years later, well informed and well-advised experts take into consideration the natural factors and hurnan opcrational factors that are the source of this economie drarna : findings from two independent expert reports produced according to Laboratory Good Pratices (GLP) at the request of civil society on sorne pesticides, highlited concordantly their poor quality (low active ingredient. content, poor quality of formulations). This work, whilst restoring truth in a fair and unbiased way, states the reasons for our past and current failures as weil as the reasons for our future successes. By proposing a new approach to studies on the efficacy of cotton insecticides, tbis work contributes to the seeking of a better phytosanitary protection for cotton in the countries of the sub-region. [less ▲]

Detailed reference viewed: 53 (2 ULg)