Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Evaluation of optimal light wavelength for the attraction of spodoptera exiguaas a model insect for mass trapping and control of Spodoptera frugiperda
    Awuor Okello, Emily ; Tol, R.W.H.M. van; Watako, Arnold ; Ariga, Emmanuel S. - \ 2020
    International Journal of Entomological Research 5 (2020)3. - ISSN 2455-4758 - p. 27 - 32.
    Visual cues have been explored in the past for the management of pests of agronomic importance, including Spodoptera frugiperda(J.E. Smith) and Spodoptera exigua (Hübner). They areused to monitor, attract and kill, or to suppress the nocturnal behaviour of the insects. The current commercial universal traps, using reflected sunlight, are not effective for nocturnal insects like Spodopteraand current light traps may use a suboptimal or unattractive wavelength since the optimal wavelength has not been tested. This research focuses on testing the attractiveness of Spodoptera exiguaas a model insect of Spodoptera frugiperdatowards specific light wavelengths. Freshly eclosed moths were tested in the wind tunnel using light emitting diodes (LED) water trap and seven light colours (365, 385, 400, 470, 530, 592 and 650 nm) at the same light intensity (brightness). The roof top light was dimmed to 4.5% of daylight conditions tested on Western flower thrips in a wind tunnel to mimic dusk and UV-A at 3.5% of total dusk light. The number of moths trapped was recorded 30 minutes after the experiment started and at the end of the experiment after 14 hours. The results revealed a significant difference among the light colours. At 30 minutes the UV-A wavelengths (365, 385 and 400 nm) were significantly different from (470, 530, 592 and 650 nm) at p=0.01 whereas at 14 hours they where significantly different at p=0.001. These results show that UV-A has the potential to be utilized in water traps for the control of Spodoptera exigua as a model insect ofSpodoptera frugiperda. However, there is need for validating the results in the field on trapping S. frugiperdausing UV-A light wavelengths and pheromones.
    Attraction of pests
    Ben-yakir, David ; Horváth, Gábor ; Tol, Robert W.H.M. Van - \ 2020
    In: Optical manipulation of arthropod pests and beneficials / Ben-Yakir, David, CABI - ISBN 9781786394705 - p. 101 - 140.
    This chapter provides information on some recent results from laboratory and field studies aimed at developing attractive and selective traps for a specific insect pest in a specific agricultural environment. Species from different orders such as Psocoptera, Hemiptera, Thysanoptera, Diptera, Lepidoptera, and Coleoptera are included.
    Visually and olfactorily enhanced attractive devices for thrips management
    Tol, Robert W.H.M. van; Davidson, Melanie M. ; Butler, Ruth C. ; Teulon, David A.J. ; Kogel, Willem Jan de - \ 2020
    Entomologia Experimentalis et Applicata 168 (2020)9. - ISSN 0013-8703 - p. 665 - 677.
    auto-dissemination - colour - Frankliniella occidentalis - lure-and-infect - methyl isonicotinate - monitoring - olfaction - pest management strategy - semiochemical - sticky plate trap - Thripidae - Thrips obscuratus - Thrips tabaci - Thysanoptera

    ‘Lure-and-infect’ is an insect pest management strategy with high potential but so far there are few examples of its application. Using traps as surrogates for auto-dissemination devices, we tested the attractiveness to naturally occurring thrips (Thysanoptera: Thripidae) of three trap types differing in colour and structure, with and without the thrips lure methyl isonicotinate (MI), and sticky plate traps as a control. The aim was to find more effective traps that could be further developed into devices for auto-dissemination and lure-and-infect of thrips. The number of thrips captured varied substantially with trap type and the presence of the MI lure. We found a high visual response to a sticky ‘white ruffle’ trap (i.e., a 30-cm-long cylindrical outline of folded fabric), compared to a commonly used blue sticky plate trap (Bug-scan) as the control. This effect was seen both in a greenhouse with roses (Rosa spp.), where we encountered western flower thrips, Frankliniella occidentalis (Pergande), and in a grass field, where we encountered onion thrips, Thrips tabaci Lindeman, and New Zealand flower thrips, Thrips obscuratus (Crawford). In the absence of MI, the white ruffle trap caught 7–22× more thrips than the control Bug-scan trap. A similarly designed blue ruffle trap and a modified Lynfield trap caught lower thrips numbers than the white ruffle and the control Bug-scan traps. Presence of MI substantially increased the captures of T. tabaci in all three trap types in the field (2.5–18×). In the greenhouse, without MI the white ruffle trap caught 3.5–14× more thrips than the Bug-scan, blue ruffle, or modified Lynfield traps. Presence of MI increased the captures of F. occidentalis males and females in the Lynfield and blue ruffle traps (1.4–2.8×), but not in the white ruffle trap in the greenhouse (ca. 1.1×). The importance of visual and olfactory factors for the design of effective auto-dissemination and lure-and-infect strategies for thrips management is discussed.

    Mass trapping of the apple sawfly Hoplocampa testudinea
    Helsen, H.H.M. ; Jansonius, P.J. ; Brouwer, G.W. ; Sluis, B.J. van der; Tol, R.W.H.M. van; Groot, A.V. de; Kats, R.J.M. van; Maas, M.P. van der - \ 2020
    In: Proceedings of the Conference, 17-19 February 2020, Hohenheim, Germany. - - p. 99 - 102.
    19th International Conference on Organic Fruit Growing: Proceedings of the Conference, 17-19 February 2020, Hohenheim
    Storymap Bodemdaling Flevoland; De BRO als basis voor ruimtelijke inrichting Flevoland
    Tol-Leenders, Dorothee van; Gerritsen, Paul ; Okx, Joop ; Massop, Harry ; Kramer, Henk ; Heidema, Nanny - \ 2020

    Kramer, Henk

    Ede klimaatbestendig maken met behulp van de Basisregistratie Ondergrond (BRO)
    Tol-Leenders, Dorothee van; Maas, Gilbert ; Gerritsen, Paul ; Okx, Joop ; Kramer, Henk - \ 2020
    Performance of Online Somatic Cell Count Estimation in Automatic Milking Systems
    Deng, Zhaoju ; Hogeveen, Henk ; Lam, Theo J.G.M. ; Tol, Rik van der; Koop, Gerrit - \ 2020
    Frontiers in Veterinary Science 7 (2020). - ISSN 2297-1769
    automatic milking machine - dairy cow - mastitis - on-farm screening tool - online-California mastitis test - somatic cell count - udder health monitoring

    Somatic cell count (SCC) is one of the most important and widely used mastitis diagnostics. For detecting (sub)clinical mastitis, online SCC related measurements are more and more used in automatic milking systems (AMS). Sensors such as an automated online California Mastitis Test (O-CMT) allow for high frequency screening of high SCC cows within a herd, which makes it potentially powerful to identify episodes of mastitis. However, the performance of O-CMT measurements, as compared to SCC determined in the laboratory (L-SCC), has only scarcely been described. The aims of this study were (1) to assess the agreement between the O-CMT measurement averaged over different time windows and the corresponding L-SCC measurements; (2) to determine the optimal time window for averaging O-CMT as compared to L-SCC; (3) to explore the added value of time-series of frequent O-CMT measurements in individual cow udder health monitoring compared to L-SCC measurements. Data were collected from 50 farms in 6 different countries that were equipped with AMS using O-CMT measurements and also performed regular L-SCC testing. We found that the overall concordance correlation coefficient (CCC) between O-CMT and L-SCC was 0.53 but differed substantially between farms. The CCC between O-CMT and L-SCC improved when averaging O-CMT over multiple milkings, with an optimal time-window of 24 h. Exploration of time series of daily O-CMT recordings show that this is an effective screening tool to find episodes of high SCC. Altogether, we conclude that although O-CMT agrees moderately with L-SCC, because of its high measurement frequency, it is a promising on-farm tool for udder health monitoring.

    Red rust thrips in smallholder organic export banana in Latin America and the Caribbean : Pathways for control, compatible with organic certification
    Arias de López, M. ; Corozo-Ayovi, R.E. ; Delgado, R. ; Osorio, B. ; Moyón, D. ; Rengifo, D. ; Suárez, P. ; Paulino, A. ; Medrano, S. ; Sanchez, L. ; Rojas, J.C. ; Vegas, U. ; Alburqueque, D. ; Staver, C. ; Tol, R. van; Clercx, L. - \ 2020
    Acta Horticulturae 1272 (2020). - ISSN 0567-7572 - p. 153 - 161.
    Bio-insecticides - Biological control of thrips - Organic banana

    Since 2010, red rust thrips (RRT) have become a serious pest in organic export banana plantations, causing yield losses of 30-40%. Although RRT blemishes on banana peel are only cosmetic, exporters apply zero tolerance. During 2014-2017, FONTAGRO co-financed studies on measures to reduce RRT damage in smallholder organic export banana. Research was initially guided by an IPM approach based on thrips population thresholds and linked abiotic factors, in order to schedule practices. Initial studies resulted in a preventive model for thrips management based on the year-round use of transparent bags with 3-mm orifices to protect bunches just as the bell emerges and before bracts open. This approach minimizes losses due to both Chaetanaphothrips signipennis found in Peru and Ecuador and Chaetanaphothrips orchidii common in the Dominican Republic. Experiments to develop scouting methods and establish thresholds suggested three conclusions: C. signipennnis flies very little, complicating trapping even with pheromones; thresholds for economic damage are very low; and scouting is difficult, costly and not practical for decision making. Routine monitoring of losses caused by RRT and other factors should be done during packing. Experiments to test the effectiveness of bagging and the use of applied products to repel or kill thrips showed that bagging alone reduced losses by 90-100% compared to bunches with no bag. Applications of organic products to the bell at bagging and the leaf whorl and the upper bunch stem simultaneously with other bunch practices reduced losses further by 0-8%. Studies of biological control identified predators, parasitoids and entomopathogens which attack different stages of thrips. Preliminary lab and release studies suggest that biological control should be further developed. However, RRT form part of a complex of insect bunch pests, and the use of general or targeted applications should be reviewed to avoid the use of products which reduce beneficial organisms.

    Bodeminformatiebehoefte voor de Metropoolregio Amsterdam : Bodeminformatie voor vraagstukken in en om de stad
    Verzandvoort, Simone ; Tol-Leenders, Dorothée van; Römkens, Paul ; Mol, Gerben ; Elsen, Erik van den - \ 2020
    Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2982) - 61
    De bodem in de stad heeft verschillende functies: gebouwen, kabels en leidingen dragen, leefruimte bieden aan stadsgroen, stadslandbouw en ecologische habitats, opvangen van verontreinigingen en neerslag. Een bodem die goed functioneert kan een aantal van deze functies tegelijkertijd uitvoeren.De Metropoolregio Amsterdam is een intensief gebruikt stedelijk gebied. De leefomgeving in dit gebied heeft problemen die deels te maken hebben met het niet optimaal functioneren van de bodem. Voorbeelden zijn een afnemende kwaliteit van stadsgroen en parken, bodemdaling die schade toebrengt aan gebouwen, bruggen, kaden en wegen, en wateroverlast na hevige regenbuien. Overheden en grondeigenaren hebben informatie nodig over kenmerken van de bodem die aangeven hoe deze functioneert voor verschillende doeleinden. Deze informatiebehoefte wordt versterkt door de noodzaak om steden aan te passen aan klimaatverandering en door een toenemende vraag naar de mogelijkheid om lokaal voedselgewassen te kunnen telen in en nabij de stad. Om de informatiebehoefte in beeld te brengen, werden interviews gehouden met medewerkers van beheersorganisaties van gebouwen, infrastructurele werken en stadsgroen en met grondeigenaren in Amsterdam en Almere. De respondenten noemden ruim zestig vraagstukken en vijftig kenmerken gerelateerd aan de bodem die relevant waren voor hun werk.Het in dit rapport gepresenteerde werk is onderdeel van het project ‘Healthy Soils for the Amsterdam Metropole (HS4AMS)’. Doel van dit project is om een flexibel systeem van meetbare bodemkenmerken te ontwikkelen om te beoordelen of bodems in de stad geschikt zijn voor verschillende soorten gebruik (bijvoorbeeld als park, stadsgroen of voedseltuin). Het systeem is ook bedoeld om advies voor maatregelen te geven specifiek voor het gewenste bodemgebruik, op basis van de gemeten bodemkenmerken. Het HS4AMS-project is een opdracht van de Flevocampus (gemeente Almere) en het AMS Institute (looptijd 2018-2021) en wordt uitgevoerd door Wageningen Environmental Research en Aeres Hogeschool.
    Consequences of negative energy balance on follicular development and oocyte quality in primiparous sows
    Costermans, N.G.J. ; Teerds, K.J. ; Middelkoop, Anouschka ; Roelen, B.A.J. ; Schoevers, E.J. ; Tol, H.T.A. van; Laurenssen, B.F.A. ; Koopmanschap, R.E. ; Zhao, Yu ; Blokland, Marco ; Tricht, E.F. van; Zak, L.J. ; Keijer, J. ; Kemp, B. ; Soede, N.M. - \ 2020
    Biology of Reproduction 102 (2020)2. - ISSN 0006-3363 - p. 388 - 398.
    Metabolic demands of modern hybrid sows have increased over the years, which increases the chance that sows enter a substantial negative energy balance (NEB) during lactation. This NEB can influence the development of follicles and oocytes that will give rise to the next litter. To study effects of a lactational NEB on follicular development, we used 36 primiparous sows of which 18 were subjected to feed restriction (3.25 kg/day) and 18 were full-fed (6.5 kg/day) during the last 2 weeks of a 24.1 ± 0.3 day lactation. Feed restriction resulted in a 70% larger lactational body weight loss and 76% higher longissimus dorsi depth loss, but similar amounts of backfat loss compared to the full fed sows. These changes were accompanied by lower plasma insulin-like growth factor 1 (IGF1) and higher plasma creatinine levels in the restricted sows from the last week of lactation onward. Ovaries were collected 48 h after weaning. Restricted sows had a lower average size of the 15 largest follicles (−26%) and cumulus–oocyte complexes showed less expansion after 22 h in vitro maturation (−26%). Less zygotes of restricted sows reached the metaphase stage 24 h after in vitro fertilization and showed a higher incidence of polyspermy (+89%). This shows that feed restriction had severe consequences on oocyte developmental competence. Follicular fluid of restricted sows had lower IGF1 (−56%) and steroid levels (e.g., β-estradiol, progestins, and androgens), which indicated that follicles of restricted sows were less competent to produce steroids and growth factors needed for oocytes to obtain full developmental competence.
    Development of a refuge-kairomone device for monitoring and control of the vine weevil, Otiorhynchus sulcatus, by lure-and-kill and lure-and-infect
    Tol, Robert W.H.M. van; Elberse, Ivonne A.M. ; Bruck, Denny J. - \ 2020
    Crop Protection 129 (2020). - ISSN 0261-2194
    Beauveria bassiana - Kairomone - Linseed oil - Lure and kill - Monitoring - Otiorhynchus sulcatus (fabricius) (Coleoptera: Curculionidae)

    Root weevils in the genus Otiorhynchus are an important pest in the nursery and small fruit production worldwide. The night-activity of the adult weevils obstruct timely monitoring and oviposition often starts before effective control measures are taken. The primary objective of this research goal was to develop an effective trap for monitoring that can be used in conjunction with the kairomone (Z)-2-pentenol and an effective means to kill the insects that enter the trap. A novel ruffle refuge trap (WeevilGrip) caught on average 4 to 5 times more weevils than a grooved board refuge in a field trial. Addition of the kairomone to the WeevilGrip further increased catches 52%. Linseed oil increased mortality to 59% and addition of Botanigard (ai Beauveria bassiana, strain GHA, Certis, BotaniGard WP 10–25%) increased mortality to 79%. The lure-refuge device consists of a flexible ruffle that can be wrapped around trees or placed on the soil within ground covers. This flexible shape maximizes contact with weevils compared to other available weevil trap designs. The WeevilGrip is an improved monitoring tool to support growers in integrated control strategies.

    Storymap Veenweide Friesland; De BRO als grondlegger voor een duurzaam Fries veenweidegebied
    Houtkamp, Joske ; Gerritsen, Paul ; Tol-Leenders, Dorothee van; Kramer, Henk ; Okx, Joop ; Heidema, Nanny - \ 2019
    Nieuwe mogelijkheden voor de bestrijding van trips in de sierteelt onder glas
    Messelink, Gerben J. ; Leman, Ada ; Holstein-Saj, Renata van; Tol, Rob van; Vijverberg, Roland ; Elfferich, Caroline ; Catalá Senent, Laura ; Huang, Tze-Yi ; Shresta, Kriti ; Kruidhof, Marjolein - \ 2019
    Bleiswijk : Wageningen University & Research, BU Glastuinbouw (Rapport / Stichting Wageningen Research, Wageningen Plant Research, Business unit Glastuinbouw GTB-895) - 90
    Western flower thrips, Frankliniella occidentalis, is a major pest species in greenhouse ornamental crops. They cause damage to leaves and flowers and can transmit viruses. Effective control requires a systems approach where measures that increase plant resilience are combined with biological control, mass trapping and (bio) pesticides. Het aim of this project with the title “Master plan thrips management in greenhouse ornamental crops” was to develop enhanced thrips control measures through 1) increased plant resilience with fungal endophytes, 2) preventive releases of natural enemies (standing army) and 3) manipulation of thrips behaviour. This report presents the results of this project that was done in the period 2015-2019.
    Pareto-optimal design and assessment of monolithic sponges as catalyst carriers for exothermic reactions
    Kiewidt, Lars ; Thöming, Jorg - \ 2019
    Chemical Engineering Journal 359 (2019). - ISSN 1385-8947 - p. 496 - 504.
    Monolithic catalyst - Multi-objective optimization - Open-cell foam - Pareto-optimal - Solid sponge - Tradeoffs

    Monolithic sponges combine low pressure losses and excellent heat transport properties and are consequently considered as promising catalyst carriers for fixed-bed reactors. Insights on how to design porosity and window size of monolithic sponges to resolve conflicting relations between low pressure losses, high thermal conductivities, and high space-time-yields (STY), i.e., a high catalyst inventory, are still unknown, especially at pilot or production scales. This study quantifies the outlined tradeoffs and assesses the potential of monolithic sponges as catalyst carriers compared to conventional packed beds of pellets. A state-of-the-art heterogeneous reactor model was applied in combination with a genetic multi-objective optimization algorithm to predict Pareto-optimal sets of sponge designs (max. STY, min. Δp,ΔTmax⩽ΔTtol). As example, the methanation of CO2 was chosen. The Pareto-optimal set of sponge designs shows that small windows are necessary to obtain high space-time-yields comparable to the ones of conventional packed beds. As a consequence, the expected low pressure loss cannot be achieved. Because of excellent heat transport properties, which are weakly dependent on the throughput, monolithic sponges however allow stable operation under varying gas loads. The results demonstrate that monolithic sponges will probably not replace packed pellet beds of pellets for the steady-state production of chemicals. Instead, they provide a competitive option for small-scale, decentralized production for example within chemical energy storage and CO2 utilization.

    De BRO als grondlegger voor een duurzaam Fries veenweidegebied
    Tol-Leenders, T.P. van; Gerritsen, Paul ; Houtkamp, J.M. ; Okx, J.P. ; Kramer, H. - \ 2019
    Wageningen UR, GeoDesk
    In het Friese veenweidegebied verdwijnt het veen langzaam en daardoor daalt de bodem. Dit heeft gevolgen voor de natuur, landbouw en bebouwing. Wetterskip Fryslân, Provincie Fryslân en andere belanghebbenden hebben samen de veenweidevisie opgesteld. De visie schetst een duurzaam ontwikkelingsperspectief voor het veenweidegebied. Deze Storymap laat zien hoe gegevens uit de Basisregistratie Ondergrond (BRO) hebben bijgedragen tot begrip van de veendaling en het ontwikkelen van effectieve maatregelen.
    Influence of different sources of copper and zinc on in vitro rumen fermentation characteristics at optimal and suboptimal pH level
    Chen, Wenzhen ; Pellikaan, W.F. ; Vande Maele, Lien ; Tol, Marije van; Aa, Arno van der - \ 2019
    Advances in Animal Biosciences 10 (2019)3. - ISSN 2040-4700 - p. 640 - 640.
    Effects of garlic and cinnamon supplementation on ruminal methanogenesis and rumen fermentation kinetics determined with the gas production technique
    Tol, Marije van; Pellikaan, W.F. ; Ensink, J. ; Aa, Arno van der - \ 2019
    Advances in Animal Biosciences 10 (2019)3. - ISSN 2040-4700 - p. 551 - 551.
    Effects of garlic and cinnamon on in vitro and in vivo rumen adaptation
    Tol, Marije van; Pellikaan, W.F. ; Ensink, J. ; Aa, Arno van der - \ 2019
    Advances in Animal Biosciences 10 (2019)3. - ISSN 2040-4700 - p. 550 - 550.
    Koolstofvoorraad in de bodem van Nederland (1998-2018) : CC-NL
    Tol-Leender, Dorothée van; Knotters, Martin ; Groot, Willy de; Gerritsen, Paul ; Reijneveld, Arjan ; Egmond, Fenny van; Wösten, Henk ; Kuikman, Peter - \ 2019
    Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2974) - 83
    De 1392 locaties van de Landelijke Steekproef Kaarteenheden werden na circa 20 jaar opnieuw bezocht om onder meer het gehalte aan organische stof en de dichtheid te bepalen. Het gehalte aan organische stof in de laag van 0 tot 30 cm blijkt tussen circa 1998 en 2018 significant te zijn afgenomen: van 6,85 naar 6,43%. In de laag van 30 tot 100 cm werd een significante afname gevonden van 7,82 naar 5,11%. Ook de koolstofvoorraden in de Nederlandse bodem bleken in de periode tussen circa 1998 en 2018 significant te zijn afgenomen. Binnen 24 deelgebieden naar bodem en landgebruik kon in bijna alle gevallen geen significante verandering worden aangetoond. Voor het deel van Nederland dat op de bodemkaart als minerale grond is gekarteerd, kon ook geen significante verandering in het gehalte aan organische stof worden aangetoond. De resultaten geven aan dat een verklaring voor afname van het landelijk gemiddelde gehalte aan organische stof ligt in oxidatie van veen en moerig materiaal. Met de ervaringen van de meetcampagne in 2018 kan de toekomstige monitoring voor post-2020 LULUCF-rapportages ter hand worden genomen, waarbij aandacht nodig is voor de effecten van veranderend landgebruik, de effecten van diepe grondbewerking, veranderingen in bodemdichtheid en de hoogte van de koolstofratio (verhouding koolstof-organische stof). Bovendien geven de resultaten aan in welke gebieden een extra meetinspanning nodig is om nauwkeurige schattingen van koolstofvoorraden en veranderingen daarin te verkrijgen.
    Luring pests with LED lamps
    Tol, Rob van - \ 2019
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