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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    A Biostimulant Seed Treatment Improved Heat Stress Tolerance During Cucumber Seed Germination by Acting on the Antioxidant System and Glyoxylate Cycle
    Campobenedetto, Cristina ; Grange, Eric ; Mannino, Giuseppe ; Arkel, Jeroen van; Beekwilder, Jules ; Karlova, Rumyana ; Garabello, Christian ; Contartese, Valeria ; Bertea, Cinzia M. - \ 2020
    Frontiers in Plant Science 11 (2020). - ISSN 1664-462X
    antioxidant molecules and enzymes - biostimulant - Cucumis sativus - gene expression - isocitrate lyase - seed treatment

    Seed enhancement technologies have the potential to improve germination and seedling growth under environmental stress. The effects of KIEM®, an innovative biostimulant based on lignin derivatives and containing plant-derived amino acids and molybdenum, were investigated on cucumber (Cucumis sativus L.) seed germination. To determine the metabolic targets of this product, biometric, transcriptional and biochemical analyses were carried out on both non-treated and KIEM®-treated seeds incubated for 24 and 48 h under standard (28°C) and heat stress (35°C) conditions. The application of the biostimulant as a seed treatment increased the percent germination (+6.54%) and fresh biomass (+13%) at 48 h, and decreased the content of H2O2 in treated seeds at 28°C (−70%) and at 35°C (−80%). These changes in biometric and biochemical properties were accompanied by changes in expression levels of the genes coding for ROS-producing (RBOH) and scavenging (SOD, CAT, GST) enzymes and their specific activity. In general, the treatment with KIEM® in heat-stress condition appeared to stimulate a higher accumulation of three scavenger gene transcripts: CuZnSOD (+1.78), MnSOD (+1.75), and CAT (+3.39), while the FeSOD isoform was dramatically downregulated (0.24). Moreover, the amount of non-protein thiols, important antioxidant molecules, was increased by the biostimulant after 48 h (+20%). Taken together these results suggest that KIEM® acts through mitigation of the effects of the oxidative stress. Moreover, after 48 h, the pre-sowing treatment with KIEM® increased the transcription levels (+1.5) and the activity of isocitrate lyase (+37%), a key enzyme of the glyoxylate cycle, suggesting a potential effect of this product in speeding up the germination process. Finally, the chemical characterization of KIEM® identified five essential and three non-essential amino acids, and others bioactive compounds, including five organic and inorganic acids that might be potentially involved in its activity. Based on these data, insights on the potential mechanism of action of the biostimulant, suggested that there are broader applications as a product able to increase seed tolerance to different abiotic stress typical of adverse environmental conditions.

    Analysis of microbial taxonomical groups present in maize stalks suppressive to colonization by toxigenic Fusarium spp.: A strategy for the identification of potential antagonists
    Köhl, J. ; Lombaers-van der Plas, C.H. ; Moretti, A. ; Bandyopadhyay, R. ; Somma, S. ; Kastelein, P. - \ 2015
    Biological Control 83 (2015). - ISSN 1049-9644 - p. 20 - 28.
    biological-control - rhizosphere microbiome - quantitative detection - microdochium-bolleyi - acremonium-strictum - fungal antagonists - idriella-bolleyi - seed treatment - head blight - durum-wheat
    Pink ear rot of maize caused by Fusarium verticillioides, Fusariumproliferatum and Fusariumgraminearumcan lead to severe yield losses and contamination of grain with a range of mycotoxins. Maize stalks colonized by Fusarium spp. are the main primary inoculum source for Fusarium incited epidemics in maize or other susceptible crops grown in rotation. The colonization of individual maize stalks originating from fields in The Netherlands, Italy and Nigeria byFusarium spp. was quantified using specific TaqMan-PCR assays. Highest values were found for F. graminearum and Fusariumavenaceum in Dutch samples, for F. graminearum and FUM producing species (F. verticillioides and F. proliferatum) in Italian samples and FUM producing Fusarium spp. in Nigerian samples. The increase in Fusarium spp. colonization under field conditions during a period of 3–6 months after harvest of the maize crops varied considerably between individual stalks. The fungal and bacterial diversity was analyzed for sub-sets of stalks with high versus low increase of Fusariumcolonization. Bacterial taxonomic groups such as Bacillus, Curtobacterium, Erwinia, Flavobacterium,Novosphingobium, Pantoea, Sphingomonas, Rahnella and Staphylococcus and fungal taxonomic groups such as Acremomium sp., Cryptococcus flavescens, Cryptococcus zeae, Leptosphaeria sp. andMicrodochium bolleyi were more abundant in the stalks with lower increase in pathogen colonization. Such fungal and bacterial groups associated with ‘suppressive stalks’ may be antagonistic to Fusarium spp. and a source of candidate strains for the selection of new biological control agents
    High relative air humidity influences mineral accumulation and growth in iron deficient soybean plants
    Roriz, M. ; Carvalho, S.M.P. ; Wilton Vasconcelos, M. - \ 2014
    Frontiers in Plant Science 5 (2014). - ISSN 1664-462X - 24 p.
    metabolic-responses - greenhouse plants - nutrient-uptake - human-nutrition - seed treatment - chlorosis - homeostasis - roots - salinity - crops
    Iron (Fe) deficiency chlorosis (IDC) in soybean results in severe yield losses. Cultivar selection is the most commonly used strategy to avoid IDC but there is a clear interaction between genotype and the environment; therefore, the search for quick and reliable tools to control this nutrient deficiency is essential. Several studies showed that relative humidty (RH) may influence the long distance transport of mineral elements and the nutrient status of plants. Thus, we decided to analyze the response of an ‘Fe-efficient’ (EF) and an ‘Fe-inefficient’ (INF) soybean accession grown under Fe-sufficient and deficient conditions under low (60%) and high (90%) RH, evaluating morphological and physiological parameters. Furthermore, the mineral content of different plant organs was analyzed. Our results showed beneficial effects of high RH in alleviating IDC symptoms as seen by increased SPAD values, higher plant dry weight, increased plant height, root length and leaf area. This positive effect of RH in reducing IDC symptoms was more pronounced in the EF accession. Also, Fe content in the different plant organs of the EF accession grown under deficient conditions increased with RH. The lower partitioning of Fe to roots and stems of the EF accessions relative to dry matter also supported our hypothesis, suggesting a greater capacity of this accession in Fe translocation to the aerial parts under Fe deficient conditions, when grown under high RH.
    Zaadbehandeling met additieven
    Derkx, M.P.M. - \ 2013
    Boom in business 2013 (2013)3. - ISSN 2211-9884 - p. 50 - 51.
    houtachtige planten als sierplanten - rosa - zaadbehandeling - toevoegingen - plantenontwikkeling - gewasbescherming - landbouwkundig onderzoek - ornamental woody plants - rosa - seed treatment - additives - plant development - plant protection - agricultural research
    Voor het eerst is er onderzoek gedaan naar het effect van additieven op het zaad van de onderstam Rosa corymbifera 'Laxa'. Voor één beuken- en twee naaldbomensoorten ligt er inmiddels een onderzoeksvoorstel klaar.
    Vervroeging van de beginontwikkeling van cichorei : Effect van vroeg zaaien, geprimed zaad, hoger plantaantal, nauwere rijafstand en water toedienen bij het zaaien
    Brink, L. van den; Wilting, P. - \ 2012
    Kennisakker.nl 2012 (2012)24 okt.
    cichorei - cultuurmethoden - zaaitijd - zaadbehandeling - zaaidichtheid - irrigatie - akkerbouw - oogsttoename - wortelgewassen - chicory - cultural methods - sowing date - seed treatment - sowing rates - irrigation - arable farming - yield increases - root crops
    In de praktijk blijkt de voorjaarsontwikkeling van cichorei vaak erg tegen te vallen. Verbetering van de voorjaarsontwikkeling kan een mogelijkheid zijn om de opbrengst te verhogen. Met name voor de percelen die vroeg geleverd worden is het interessant om door middel van een vroege ontwikkeling in het voorjaar de opbrengst te verhogen. In de jaren 2009 t/m 2011 is daarom onderzoek gedaan naar de effecten van vroeg zaaien, geprimed zaad, rijafstand, plantaantal en watertoediening bij zaaien. Uit dit onderzoek is gebleken dat vroeger zaaien een opbrengstverhoging van 7% per twee weken gaf, uitgaande van niet vroeger zaaien dan 25 maart en een goed schieterresistent ras. Geprimed zaad gaf een vervroeging van de opkomst met 4 dagen, een verhoging van het plantaantal met 14% en een verhoging van de inuline-opbrengst met gemiddeld 1,9%. De invloed van rijafstand en plantaantal was minder groot. Water geven in de zaaivoor bleek niet goed mogelijk te zijn. Water geven achter het aandrukwiel was wel mogelijk, maar de praktische nadelen van deze manier van water geven waren dusdanig groot dat volvelds beregenen na zaaien met een beregeningsinstallatie meer voor de hand ligt.
    Vervroeging beginontwikkeling cichorei; onderzoeksverslag 2009, 2010 en 2011
    Brink, L. van den; Wilting, P. - \ 2012
    Lelystad : PPO AGV - 35
    cichorei - cultuurmethoden - zaaitijd - zaadbehandeling - zaaidichtheid - irrigatie - akkerbouw - oogsttoename - wortelgewassen - chicory - cultural methods - sowing date - seed treatment - sowing rates - irrigation - arable farming - yield increases - root crops
    In de jaren 2009, 2010 en 2011 is onderzocht hoe de beginontwikkeling van cichorei versneld kan worden. Hierbij is gekeken naar vroeger zaaien, gebruik maken van geprimed zaad, verhoging van het plantaantal, toepassen van een nauwere rijafstand en het toedienen van water bij het zaaien. De proeven zijn uitgevoerd in Valthermond en Colijnsplaat. In alle jaren is het ras Bronze gebruikt. In 2010 is ook Chrysolite gebruikt.
    Effecten van enkele additieven op de opkomst van Rosa corymbifera 'Laxa' zaad
    Derkx, M.P.M. - \ 2012
    Lisse : Praktijkonderzoek Plant & Omgeving BBF - 13
    rosa corymbifera - zaden - zaadkieming - zaadbehandeling - plantmateriaal - groeistimulatoren - houtachtige planten als sierplanten - landbouwkundig onderzoek - nederland - rosa corymbifera - seeds - seed germination - seed treatment - planting stock - growth stimulators - ornamental woody plants - agricultural research - netherlands
    In een aantal landbouwgewassen is gevonden dat een zaadcoating met additieven een positief effect kan hebben op de kieming, de wortelontwikkeling en de groei. Een zaadcoating is een dun laagje dragermateriaal dat op het zaad wordt aangebracht. Additieven is de verzamelnaam van een groep producten die aan zaden toegevoegd worden vóór uitzaai. Het kunnen gewasbeschermingsmiddelen zijn, maar ook groeistimulatoren en micro-organismen. Om te kijken of additieven ook meerwaarde kunnen hebben voor boomkwekerijgewassen, is een eerste oriënterende proef uitgevoerd met gestratificeerd zaad van Rosa corymbifera ‘Laxa’. Drie verschillende additieven zijn getest. Het ging hierbij om natuurlijke stoffen, o.a. uit humuszuren en uit organisch materiaal. Vanwege het beperkte budget is alleen gekeken naar effecten op de opkomst en is niet gekeken of de additieven een positief effect hebben op de groei en ontwikkeling van bovengrondse en ondergrondse delen. De geteste additieven gaven geen verbetering van de opkomst. De opkomst van alle behandelingen lag tussen 48 en 57%. Ook waren geen effecten op de opkomstsnelheid zichtbaar. Mogelijk hebben de additieven wel invloed op de wortelontwikkeling en de bovengrondse groei. Dit kan in vervolgonderzoek nagegaan worden.
    Impacts of farmer-based training in seed production in Vietnam
    Tin Huynh Quang, - \ 2009
    Wageningen University. Promotor(en): Paul Struik, co-promotor(en): Lisa Price; T.BE. Tran. - [S.l.] : S.n. - ISBN 9789085854999 - 175
    oryza sativa - rijst - zaden - zaadbehandeling - boeren - kleine landbouwbedrijven - vietnam - farmer field schools - oryza sativa - rice - seeds - seed treatment - farmers - small farms - vietnam - farmer field schools
    Key words: farmer seed production school, farm-saved seed, formal seed sector, impact assessment, improved practice, local practice, rice (Oryza sativa), seed production, seed quality, Vietnam

    Rice (Oryza sativa) is the most important food and cash crop of Vietnam. It is cultivated in all provinces of the country since ancient times. Farm-saved seed is the most important seed source covering more than 80% of the farmers’ seed needs. However, farmers not always use the best techniques of producing and selecting seeds. Inadequate seed quality is an important yield limiting factor in rice production.
    To improve the farmers’ capacity to produce, process, store and use good rice seed, the farmer seed production school (FSPS) training programme was conducted in seven provinces of Vietnam during the period 2003−2007. The study reported in this thesis took place in four out of those seven provinces, i.e. Nam Dinh, Nghe An, Binh Dinh and Dong Thap. The objective was to assess to what extent farmers’ knowledge in seed production practices and seed quality management had increased and whether that knowledge increase was reflected in an increase in potential rice yields and profits, and in diffusion of retained practices after training to other farmers in communities.
    A long seed production training programme with the farmer field school approach was combined with field demonstrations including plots with either local practices or improved practices which were conducted in each FSPS. We recorded and analysed data on on-farm demonstrations at 429 FSPSs and on ex-ante and ex-post tests of knowledge at the FSPSs. Moreover, we carried out a survey among 240 rural households.
    Results of the study indicate that some rice varieties were better adopted in the farming systems than other varieties: well adopted ones were KD18 in both Nam Dinh and Nghe An province and OM1490, Ai32 and MO2718 in Binh Dinh and Dong Thap. With local practices in the farm-saved seed system of the transplanted rice crop, farmers used old seedlings, planted many seedlings per hill, planted too many or too few plants per unit area and applied unbalanced quantities of fertilizers; for the directly sown crop farmers used high seed rates in the traditional system. Rice yields showed larger differences between local practices and improved practices in the dry season than in the wet season all across Vietnam. With improved practices at the FSPSs, rice yields were 8.5% higher in the wet season and 13.6% higher in the dry season; additional profits associated with the improved practice in both the dry and wet seasons averaged 212 US$ ha-1. The majority of the FSPS-farmers moved from food production to seed production, reduced seed rates by about 50%, and used high quality seed to produce seeds with much better quality. More important is that the FSPS-farmers diffused improved practices (79%) and shared good seeds (57% of respondents) with other farmers in their communities to help other rice growers to improve their productivity. A large proportion of non-FSPS farmers learned and applied improved practices for rice production through neighbouring FSPS-farmers within the community. Besides, evaluation in acquired knowledge during training showed that FSPS-farmers with lower scores (<20%) in the ex-ante test realized an enormous improvement of 55.4% points in the ex-post test. There was a clear trend: the higher the scores in the ex-ante test, the smaller the increase in the score, suggesting that the tests provided insight into the knowledge gaps for improvement in training programmes.
    The FSPS is considered as a good training model for farmers. The FSPS-farmers well retained the acquired knowledge and applied the improved practices to enhance the farm-saved seed system in the project provinces. The community capacity was strengthened through establishing seed clubs by FSPS-farmers. It created a seed supply and production network to ensure seed security for small farmer’s seed needs in the rural areas. Thus, it promoted seed policies to strengthen the informal seed system in Vietnam.
    Impacts of farmer-based training programme in seed production illustrate that in a country like Vietnam where more than seventy percent of the population live in rural areas and depend on agricultural production, farmer education is a very effective way for agricultural development.


    Een alcoholtest voor zwakke zaden
    Groot, S.P.C. ; Kodde, J. - \ 2009
    biologische landbouw - zaadbehandeling - groeikracht - gewasbescherming - analytische methoden - vermeerderingsmateriaal - kiemkracht - organic farming - seed treatment - vigour - plant protection - analytical methods - propagation materials - germinability
    Deze poster bevat resultaten uit onderzoek naar een snellere bepaling van de vigour van biologische zaden: alcoholproductie van de zaden
    Control of seed-borne pathogens on legumes by microbial and other alternative seed treatments
    Tinivella, F. ; Hirata, L.M. ; Celan, M.A. ; Wright, S.A.I. ; Amein, T. ; Schmitt, A. ; Wolf, J.M. van der; Koch, E. ; Groot, S.P.C. - \ 2009
    European Journal of Plant Pathology 123 (2009)2. - ISSN 0929-1873 - p. 139 - 151.
    colletotrichum lindemuthianum - gewasbescherming - biologische bestrijding - plantextracten - ascochyta - geïntegreerde plagenbestrijding - biologische landbouw - zaadbehandeling - colletotrichum lindemuthianum - plant protection - biological control - plant extracts - ascochyta - integrated pest management - organic farming - seed treatment - growth-promoting rhizobacteria - systemic resistance - powdery mildew - clonostachys-rosea - fusarium-culmorum - bacillus-subtilis - salicylic-acid - root-rot - biocontrol - diseases
    Greenhouse trials were carried out in order to test the efficacy of different seed treatments as alternatives to chemicals against Colletotrichum lindemuthianum cause of anthracnose on bean and Ascochyta spp. cause of Ascochyta blights on pea, respectively. Resistance inducers, commercially formulated microorganisms, non-formulated selected strains of different microorganisms (fungi, bacteria and yeasts) and plant extracts were applied as dry or liquid seed treatments on naturally infested seeds. Seedling emergence and disease incidence and/or severity were recorded. Almost all seed treatments turned out to be ineffective in controlling the Ascochyta infections, which is in line with the literature stating that these pathogens are difficult to control. The only alternative treatments that gave some control of Ascochyta spp. were thyme oil and a strain of Clonostachys rosea. The resistance inducers tested successfully controlled infections of bean by C. lindemuthianum. Among the formulated microorganisms, Bacillus subtilis-based formulations provided the best protection from anthracnose. Some strains of Pseudomonas putida, a disease-suppressive, saprophytic strain of Fusarium oxysporum and the mustard powder-based product Tillecur also proved to be effective against bean anthracnose. However, among the resistance inducers as well as among the other groups, certain agents caused a significant reduction of plant emergence. Different alternative seed treatments can therefore be used for the control of C. lindemuthianum on bean, while on pea only thyme oil and a strain of Clonostachys rosea showed some effectiveness against Ascochyta spp.
    Film coating van boomzaden met fungiciden tegen kiemplantenziekte
    Derkx, M.P.M. ; Brouwer, J. - \ 2008
    Lisse : PPO Bloembollen en Bomen (Rapport / PPO 12349) - 25
    zaden - houtachtige planten als sierplanten - onderstammen - rosa - zaadbehandeling - plantenziekten - kieming - botrytis - fusarium - pythium - rhizoctonia - schimmelziekten - gewasbescherming - coating - fungiciden - seeds - ornamental woody plants - rootstocks - rosa - seed treatment - plant diseases - germination - botrytis - fusarium - pythium - rhizoctonia - fungal diseases - plant protection - coating - fungicides
    Pasgekiemde zaden of jonge planten van bos- en haagplantsoengewassen en rozenonderstammen vallen regelmatig weg door kiemplantenziekte. Bodemschimmels zoals Botrytis, Fusarium Pythium en Rhizoctonia zijn de boosdoeners. Deze schimmels slaan vooral toe onder natte omstandigheden. Ook in andere landbouwgewassen is kiemplantenziekte een probleem. In deze gewassen hebben film coatings met daarin fungiciden in het verleden hun waarde bewezen: het percentage uitval neemt enorm af. Film coatings met fungiciden blijken nu ook perspectief te bieden voor de bos- en haagplantsoensector. Dat is gebleken in proeven op de Proeftuin Noordbroek en op drie bedrijven in het noorden van het land en in de regio Zundert. Voor de soorten Acer palmatum, Tilia cordata, Prunus avium en Pinus sylvestris is een veilige film coating ontwikkeld, die geen schade geeft aan het zaad. In Fagus sylvatica is dat nog niet gelukt. Het testen van de film coatings op bos- en haagplantsoenbedrijven is succesvol verlopen. In een aantal gevallen gaven zaden met een film coating een aanzienlijk hoger aantal planten dan zaden die niet behandeld waren. Soms was er weinig verschil, maar traden er ook geen problemen met kiemplantenziekte op. De kosten voor film coating zijn heel snel terug te verdienen door de hogere plantaantallen.
    Film coating van boomzaden
    Derkx, M.P.M. - \ 2008
    bomen - zaden - zaadbehandeling - voorbehandeling - zaailingen - boomkwekerijen - houtachtige planten - ziektepreventie - fungiciden - trees - seeds - seed treatment - pretreatment - seedlings - forest nurseries - woody plants - disease prevention - fungicides
    Onderzoek en resultaten naar een veilige film coating voor een aantal boomzaden die gevoelig zijn voor kiemplantenziekten
    Effect of the activation of germination processes on the sensitivity of seeds towards physical sanitation treatments
    Groot, S.P.C. ; Birnbaum, Y.E. ; Kromphard, C. ; Forsberg, G. ; Rop, N. ; Werner, S. - \ 2008
    Seed Science and Technology 36 (2008)3. - ISSN 0251-0952 - p. 609 - 620.
    zaden - zaadbehandeling - seeds - seed treatment - borne pathogens - maturity - performance - tolerance - hot
    Physical treatments of seeds to eradicate pathogens have the risk of reducing vitality of the seeds. Seed lots may differ in sensitivity to these treatments, therefore factors influencing this sensitivity, including the physiological condition of the seeds, should be identified. In this study priming was used to mimic the effect of pre-harvest onset of germination on the sensitivity to these treatments. The effect of humidification, by incubation for one day at 100% RH, followed by drying back, on the sensitivity was also analysed. Primed, humidified and control seeds were subjected to hot water, aerated steam or electron beam treatments at various levels. Two seed lots from Daucus carota (carrot), two seed lots from Brassica oleracea (kohlrabi) and one seed lot from Allium cepa (onion) were used in the tests. Primed seeds from all seed lots were more sensitive to the aerated steam treatment and the B. oleracea and A. cepa seed lots were also more sensitive to the hot water treatment after priming. Priming had no effect on the sensitivity towards the electron beam treatment. Humidification had no effect on the sensitivity towards the physical seed treatments, with the exception of the humidified onion seeds, which were clearly more tolerant towards the aerated steam treatment. It is concluded that seed companies should be aware that the onset seed germination processes prior to harvest may increase the sensitivity of the seeds towards aerated steam and hot water treatments.
    Nieuw advies voor bestrijding zwartsnot
    Koster, A.T.J. ; Bulle, A.A.E. ; Vreeburg, P.J.M. ; Korsuize, C.A. - \ 2008
    BloembollenVisie 2008 (2008)152. - ISSN 1571-5558 - p. 24 - 24.
    bloembollen - hyacinthus - plantenziekteverwekkende schimmels - ziektebestrijding - gewasbescherming - zaadbehandeling - zaadontsmettingsmiddelen - ornamental bulbs - hyacinthus - plant pathogenic fungi - disease control - plant protection - seed treatment - seed dressings
    Zwartsnot in hyacint was alleen te bestrijden met Sumisclex. Nu dit middel niet meer mag worden gebruikt is de vraag welke alternatieven voorhanden zijn. PPO onderzocht diverse producten, met een nieuw advies als resultaat
    Filmcoating boomzaden levert meer opbrengst op
    Derkx, M.P.M. ; Brouwer, J. - \ 2008
    De Boomkwekerij 21 (2008)33. - ISSN 0923-2443 - p. 14 - 14.
    houtachtige planten als sierplanten - plantenziekteverwekkende schimmels - zaden - zaadbehandeling - boomteelt - ornamental woody plants - plant pathogenic fungi - seeds - seed treatment - arboriculture
    Kiemplantenziekte is de schrik van menig boomkweker, maar voor een aantal gewassen is er nu een goede en veilige methode voorhanden om de zaden tegen deze ziekte te beschermen. De kosten voor deze zogeheten filmcoating zijn snel terug te verdienen.
    Compounds of natural origin for seed treatment
    Wolf, J.M. van der; Birnbaum, Y.E. - \ 2008
    biologische landbouw - zaadbehandeling - schimmelziekten - plantenziekten - thymus - antibacteriële planten - organic farming - seed treatment - fungal diseases - plant diseases - thymus - antibacterial plants
    In organic agriculture, the use of synthetic agents during seed production- and processing, to control seed transmissible diseases, is not allowed. In this poster results of research on the potential value of formulated thyme oil for control of seed transmissible bacterial and fungal diseases on seed are presented
    Commercial organic pelleting and priming treatments for sugar beet seed
    Halmer, P. ; Groot, S.P.C. ; Birnbaum, Y.E. ; Groeneveld, R.M.W. ; Swaay, N. - \ 2008
    suikerbieten - groei van zaailingen - zaadbehandeling - biologische landbouw - sugarbeet - seedling growth - seed treatment - organic farming
    Disinfection of vegetable seed by treatment with essential oils, organic acids and plant extract
    Wolf, J.M. van der; Birnbaum, Y.E. ; Zouwen, P.S. van der; Groot, S.P.C. - \ 2008
    Seed Science and Technology 36 (2008). - ISSN 0251-0952 - p. 76 - 88.
    zaadbehandeling - desinfectie - antimicrobe-eigenschappen - biologische landbouw - seed treatment - disinfection - antimicrobial properties - organic farming - tea-tree oil - antimicrobial activity - staphylococcus-aureus - storage fungi - shelf-life - humid air - components - respiration - inhibition - terpenoids
    Various essential oils, organic acids, Biosept, (grapefruit extract), Tillecur and extracts of stinging nettle and golden rod were tested for their antimicrobial properties in order to disinfect vegetable seed. In in vitro assays, thyme oil, oregano oil, cinnamon oil, clove oil and Biosept had the highest activity against the seed borne pathogens Xanthomonas campestris pv. campestris, Clavibacter michiganensis subsp. michiganensis, Alternaria dauci and Botrytis aclada. Low antimicrobial activity was found for the organic acids against the fungal pathogens. Seed treatment for 0.5 h with selected essential oils or Biosept in concentrations between 0.1 and 1% eliminated > 99% of total bacteria associated with cabbage seed. It also reduced the percentage of seeds contaminated with fungi in blotter tests from 70% to less than 10%. Extended periods of treatment did not significantly improve results. Cinnamon oil and Biosept used in concentrations exceeding 1% had a negative effect on seed germination. Antimicrobial effects with organic acids were variable, but in general, the organic acids ascorbic acids, propionic acid, acetic acid and lactic acid at concentrations of 2.5% or higher, reduced seed-associated bacteria. Of the organic acids, only propionic acid reduced seed germination at a concentration higher than 1%. Thyme oil was considered the most promising natural compound for reducing seed borne pathogens in seed.
    Various essential oils, organic acids, Biosept, (grapefruit extract), Tillecur and extracts of stinging nettle and golden rod were tested for their antimicrobial properties in order to disinfect vegetable seed. In in vitro assays, thyme oil, oregano oil, cinnamon oil, clove oil and Biosept had the highest activity against the seed borne pathogens Xanthomonas campestris pv. campestris, Clavibacter michiganensis subsp. michiganensis, Alternaria dauci and Botrytis aclada. Low antimicrobial activity was found for the organic acids against the fungal pathogens. Seed treatment for 0.5 h with selected essential oils or Biosept in concentrations between 0.1 and 1% eliminated > 99% of total bacteria associated with cabbage seed. It also reduced the percentage of seeds contaminated with fungi in blotter tests from 70% to less than 10%. Extended periods of treatment did not significantly improve results. Cinnamon oil and Biosept used in concentrations exceeding 1% had a negative effect on seed germination. Antimicrobial effects with organic acids were variable, but in general, the organic acids ascorbic acids, propionic acid, acetic acid and lactic acid at concentrations of 2.5% or higher, reduced seed-associated bacteria. Of the organic acids, only propionic acid reduced seed germination at a concentration higher than 1%. Thyme oil was considered the most promising natural compound for reducing seed borne pathogens in seed.
    Het opwaarderen van boomzaden door middel van vloeistofscheiden
    Derkx, M.P.M. - \ 2007
    Lisse : PPO Bloembollen en Bomen - 37
    zaadbehandeling - bomen - acer pseudoplatanus - carpinus betulus - crataegus monogyna - prunus avium - larix kaempferi - zaadkieming - seed treatment - trees - acer pseudoplatanus - carpinus betulus - crataegus monogyna - prunus avium - larix kaempferi - seed germination
    Voor groente- en bloemzaden is ruim 10 jaar geleden een schoningstechniek ontwikkeld (vloeistofscheiding), waarbij zaden gesorteerd worden op basis van hun dichtheid. Bij deze techniek worden de zaden kort in vloeistoffen met verschillende dichtheden gebracht en dit resulteert in zaadfracties met verschillende dichtheden. De dichtheid van het zaad correleert met het kiemgedrag. De afgelopen jaren is onderzocht of deze techniek ook perspectief biedt voor boomzaden. Gekozen is voor soorten die met de huidige sorteertechnieken onvoldoende te verbeteren zijn, t.w. Acer pseudoplatanus, Carpinus betulus, Crataegus monogyna, Prunus avium en Larix kaempferi. In twee opeenvolgende jaren zijn 2-3 herkomsten van elke soort gesorteerd door middel van vloeistofscheiden. Dit resulteerde in zaadfracties met verschillende dichtheden. Vaak was de kieming van een fractie beter naarmate de dichtheid van het zaad hoger was. Zaadfracties met de laagste dichtheid kiemden soms helemaal niet of zeer beperkt. Op basis van de kiemcijfers van de verschillende fracties kan dan besloten worden welke fracties uitgezaaid worden. Eventueel kunnen slechter kiemende fracties ook uitgezaaid worden, maar dan dichter of eventueel voor een andere toepassing.
    Beheersing van fusarium in zomertarwe
    Scholten, O.E. - \ 2007
    BioKennis bericht Akkerbouw & vollegrondsgroenten 6 (2007). - p. np - np.
    akkerbouw - gewasbescherming - tarwe - fusarium - mycotoxinen - fusarium culmorum - rasreacties - zaadbehandeling - biologische landbouw - vollegrondsteelt - arable farming - plant protection - wheat - fusarium - mycotoxins - fusarium culmorum - varietal reactions - seed treatment - organic farming - outdoor cropping
    Fusariumschimmels veroorzaken in zomertarwe een slechte opkomst van zaaizaad en verlies aan opbrengst. Ook produceren ze mycotoxinen in de korrels. Vooral de mycotoxinen zijn met het oog op voedselveiligheid en diergezondheid een toenemende bron van zorg. Het is dus echt een ketenprobleem. Alle reden om de ziekte beheersbaar te maken. Er zijn diverse aanknopingspunten en ontwikkelingen.
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