Paulownia 03

Paulownia: leicht und stabil; das „Aluminium“ unter den Hölzern als Beispiel für schnell nachwachsende Rohstoffe


31. August 2020

Interview von Prof. Pude zur Bioökonomie, Nachhaltigkeit und Nachwachsenden Rohstoffen für 96bonnFM im Rahmen der Serie "Wissensbissen" (Folge 13: Bioökonomie).

13. August 2020

Eröffnung des Papiertechnikums durch NRW. Minsterin Ursula Heinen-Esser und den Kanzler der Univerität Bonn Holger Gotschalk
Einweihung Papiertechnikum 2020
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Sie sind hier: Startseite Mitarbeiter Thorsten Kraska

Dr. rer. hort. Thorsten Kraska

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Horticultural trials

On behalf of the management board of the Field Lab Campus Klein-Altendorf (Faculty of Agriculture, University of Bonn) I coordinate research experiments in the greenhouses. I am a member of the research group for Renewable Resources. My own research interests are

  • sustainable horticultural production
  • optimizing cultivation of crops under protected conditions
  • soilless cultivation of vegetables, ornamentals, and fruits using renewables as growing medium
  • alternative growing media for greenhouse production
  • optimization and full valorization of horticultural value chain including side streams
  • use of biorationals to protect crops against biotic and abiotic stress factors
  • bioactive substances from horticultural plants
  • non invasive phenotyping of plants
These research interests are focussed in three major areas
  • Growing Media for sustainable plant production We particulary interested in the valorization of renewable biomass plants like Miscanthus as growing substrate for horticultural crops such as tomatoes, cucumbers, strawberries, or ornamentals. The research is focussed on Miscanthus as model for alternative growing medium. Our aim is to understand the complex substrate-plant-interactions to optimize plant performance. In our holistic approach we are further interested in the cascading utilization of the substrate before or after its use a growing medium (e.g. direct combustion, re-use as growing medium, feedstock for chemical induustry) including how a pretreatment of the original feedstock can improve quality, how Miscanthus as growing substrate is changing its prperties over the cultivation period, and which alternative valorization strategies can be achieved by using Miscanthus as growing medium.  We could alreday show that Miscanthus is a feasible alternative to Stone Wool in soilless cultivation of tomatoes and cucumbers (Kraska et al., 2018). In these studies we could also demonstrate the cascading use a solid fuel showing possible Miscanthus Utilization Pathways as described in the MisCas project. Recently we show that Miscanthus could also be used in soilless cultivation of strawberries in the greenhouseunder practical conditions (Kraska et al., 2019).
  • Drying (self-drying, siccative) Plant Oils as Biorationals in Plant Production. Plant oils have been used in plant protection and plant strenthening for many years. We are specifically interested in the utilization of plant oils (triglcerides) derived from linseed (Linum usitatissimum) and Tung Tree (Vernica fordii). These oils are drying through oxidation and build a film on surfaces. We use this self-drying characteristics to protect or to strengthen crops against abiotic and biotic environmental stresses. These plant oils can clearly be distinguished from other oils (essential oils, mineral oils) used in horticulture or agriculture by their chemistry. The oils we used are triglcerides. Their advantage is a low ecotoxicity. Projects so far have been supported by the German Federal Environmental Foundation (DBU) through a personal PhD grant and the Ministry for Environment, Agriculture, Conservation and Consumer Protection of the State of North Rhine-Westphalia (MLUNV). [more]. In 2021 we publish how a new formulation of linseed oil and tung oil protect Green Beans against Bean Rust (Uromyces appendiculatus) (Breiing et al., 2021). These drying oils could be used in organic farming due to their low ecotoxicology and good biological degradability.
Figure 5 (plants-10-00143-g005)
Figure 5 taken from Breiing et al. (2021) showing protective and curative control of bean rust after appication of drying oils (linseed oil, L and tung oil, T) in comparison to other treatments (see open access publication for details)
  • Valorization of tea hortensias. Hydrangea macrophylla ssp. serrata are traditionally used in China as ceremonial tea (Amacha). The sweet taste of this tea is based on Phyllodulcin. We are interested in the value chain and how cultivation of this crop can be done. Currently we are partner in the SweetTea Project funded by the FNR.



I am / I have been involved in the following scientific projects


  • RegAff: Regulatory Affairs for plant protection products, biorationals, biobased products and techniques. 2019-2020.


  • Biobasierte, selbsttrocknende Pflanzenölfilme zum Schutz von Pflanzen gegenüber Umweltstress (Substances from renewable resources to protect plants against stress), 2016-2019
  • BioIP - Bio Innovation Park Rheinland - Etablierung eines klimaneutralen, regionalen Wissenschafts- und Gewerbepark (Establishment of a clima neutral, regional Science and Industry Park), 2015-2017

  • MisQual - Genotype and environment as driving factors for quality of lignocelluloses from Miscanthus as raw material for industry, 2014-2015
  • MisCas - Cascade Utilization of Miscanthus to increase resource efficiency (Kaskadennutzung von Miscanthus zur Steigerung der Ressourceneffizienz), 2014-2015


Publications (peer-reviewed, book chapter)

(if you do not have access to the publications contact me for a reprint) in descending order of publication date


  • Nguyen, V.T.H., Elfers, J., Kühn, H., Kraska, T., Pude, R. (2021). Different Miscanthus genotypes as growing media in soilless tomato cultivation and its subsequent use for combustion. Acta Hortic., 1305, 301-308.
  • He, F., Thiele, B., Kraus, D., Bouteyine, S., Watt, M., Kraska, T., Schurr, U., Kuhn, A. J. (2021). Effects of Short-Term Root Cooling before Harvest on Yield and Food Quality of Chinese Broccoli (Brassica oleracea var. alboglabra Bailey). Agronomy, 11(3), 577.
  • Breiing, V., Hillmer, J., Schmidt, C., Petry, M., Behrends, B., Steiner, U., Kraska, T., Pude, R. (2021). Fungicidal Efficacy of Drying Plant Oils in Green Beans Against Bean Rust (Uromyces appendiculatus). Plants, 10(1), 143.


  • Quirós Vargas, J., Bendig, J., Mac Arthur, A., Burkart, A., Julitta, T., Maseyk, K., Thomas, R., Siegmann, B., Rossini, M., Celesti, M., Schüttemeyer, D., Kraska, T., Muller, O., Rascher, R. (2020). Unmanned Aerial Systems (UAS)-Based Methods for Solar Induced Chlorophyll Fluorescence (SIF) Retrieval with Non-Imaging Spectrometers: State of the Art. Remote Sens., 12(10), 1624; Online:
  • He, F., Thiele, B., Santhiraraja-Abresch, S., Watt, M., Kraska, T., Ulbrich, A., Kuhn, A.J. (2020). Effects of Root Temperature on the Plant Growth and Food Quality of Chinese Broccoli (Brassica oleracea var. alboglabra Bailey) . Agronomy, 10, 702.
  • Heinemann, S., Siegmann, B., Thonfeld, T., Muro, J., Jedmowski, C., Kemna, A., Kraska, T., Muller, O., Schultz, J., Udelhoven, T., Wilke, N., Rascher, U. (2020). Land Surface Temperature Retrieval for Agricultural Areas Using a Novel UAV Platform Equipped with a Thermal Infrared and Multispectral Sensor. Remote Sens., 12, 1075.


  • Keller, B., Matsubara, S., Rascher, U., Pieruschka, R., Steier, A., Kraska, T., Muller, O. (2019). Genotype Specific Photosynthesis x Environment Interactions Captured by Automated Fluorescence Canopy Scans Over Two Fluctuating Growing Seasons. Frontiers in Plant Science, 10, Article 1482, Nov 2019.
  • Siegmann, B., Alonso, L., Celesti, M., Cogliati, S.,Colombo, R., Damm, A., Douglas, S., Guanter, L., Hanus, J., Kataja, K. Kraska, T., Matveeva, M., Moreno, J., Muller, O., Pikl, M., Pinto, F., Quiros Vargas, J., Rademske, P., Rodriguez-Morene, F., Sabater, N., Schickling, A., Schüttemeyer, D., Zemek, F., Rascher, U. (2919). The High-Performance Airborne Imahing Spectrometer HyPlant - From Raw Images to Top-of-Canopy Reflectance and Fluorescence Products: Introduction of an Automatized Processing Chain. Remote Sensing, 11(23), 2760,
  • He, F., Thiele, B., Watt, M., Kraska, T., Ulbrich, A., Kuhn, A.J. (2019). Effects of Root Cooling on Plant Growth and Fruit Quality of Cocktail Tomato during two consecutive seasons. J. Food Qual., Artcile ID 3598172.
  • Bergs, M., Völkering, G., Kraska, T., Pude, R., Do, X.T., Kusch, P., Monakhova, Y., Konow, C., Schulze, M. (2019). Miscanthus x giganteus Stem Versus Leaf-Derived Lgnins Differing in Monolignol Ratio and Linkage. Int. J. Mol. Sci., 20, 1200.
  • Wilke, N., Siegmann, B., Klingbeil, L., Burkart, A., Kraska, T., Muller, O., van Doorn, A., Heinemann, S., Rascher, U. (2019). Quantifying Lodging Percentage and Lodging Severity Using a UAV-Based Canopy Height Model Combined with an Objective Threshold Approach. Remote Sens., 11, 515.
  • Yang, P., van der Tol, C., Verhoef, W., Damm, A., Schickling, A., Kraska, T., Muller, O., Rascher, U. (2019). Using reflectance to explain vegetation biochemical and structural effectson sun-induced chlorophyll fluorescence. Remote Sensing of Environment, 231, 110996.


  • Thomas, S., Behmann, J., Steier, A., Kraska, T., Muller, O., Rascher, U., Mahlein, A.-K. (2018). Quantitative assessment of diseases severity and rating of barley cultivars based on hyperspectral imaging in a non-invasive, automated phenotyping platform. Plant Methods, 14(45).
  • Kraska, T., Kleinschmidt, B., Weinand, J., Pude, R. (2018). Cascading use of Miscanthus as growing substrate in soilless cultivation of vegetables (tomatoes, cucumbers) and subsequent direct combustion. Sci. Hort., 235, 205-213,
  • Burkart, A., Hecht, V.L., Kraska, T., Rascher, U. (2018). Phenological analysis of unmanned aerial vehicle based time series of barley imagery with high temporal resolution. Precision Agric., 19(1), 134-146.


  • Winzer, F. Kraska, T., Eisenberger, C., Kötter, T., Pude, R. (2017). Biomass from fruit trees for combined energy and food production. Biomass Bioenerg, 107, 279-286.​1016/​j.​biombioe.​2017.​10.​027.
  • (Book Chapter) Cendrero-Mateo, M.P., Muller, O., Albrecht, H., Burkart, A., Gatzke, S., Janssen, B., Keller, B., Körber, N., Kraska, T., Matsubara, S., Li, J., Müller-Linow, M., Pieruschka, R., Pinto, F., Rischbeck, P., Schickling, A., Steier, A., Watt, M., Schurr, U., Rascher, U. (2017). Field Phenotyping: Concepts and Examples to Quantify Dynamic Plant Traits across Scales in the Field. In: Chabbi A., Loescher, H.W. (eds.): Terrestrial Ecosystem Research Infrastructure: Challenges and Opportunities. Chapter 3, 53-80. CRC Press, Taylor & Francis, Boca Raton, USA.
  • Ashrafuzzaman, Md., Lubna, F.A., Holtkamp, F., Manning, W.J.,  Kraska, T., Frei, M. (2017).  Diagnosing ozone stress and differential tolerance in rice (Oryza sativa L.) with ethylenediurea (EDU).  Environmental Pollution, 230, 339-350.

before 2017

  • Ueda, Y., Frimpong, F., Qi, Y., Matthus, E., Wu, L., Höller, S., Kraska, T., Frei, M. (2015). Genetic dissection of ozone tolerance in rice (Oryza sativa L.) by a genome-wide association study. J. Exp. Bot., 66(1), 293-306.
  • Rascher, U., Alonso, L., Burkart, A., Cilia, C., Cogliati, R., Colombo, R., Damm, A., DruschM., Guanter, L., Hanus, J., Hyvärinen, T., Julitta, T., Jussila, J., Kataja, K., Kokkalis, P., Kraft, S., Kraska, T., Matveeva, M., Moreno, J., Muller, O., Panigada, C., Pikl, M., Pinto, F., Prey, Pude, R., Rossini, M., Schickling, A., Schurr, U., Schüttemeyer; D., Verrelst, J., Zemek, F. (2015). Sun-induced fluorescence – a new probe of photosynthesis: First maps from the imaging spectrometer HyPlant. Global Change Biology, 21, 4673-4684.

More publications can be found at ResearchGate


...more Publications

(if you do not have access to the publications contact me for a reprint)

  • Kraska, T., Pude, R. (2019). Miscanthus als Pflanzsubstrat für Erdbeeren - eine nachhaltige Alternative? Obstbau, 11/2019, 570-574 [PDF]
  • Muller, O., Keller, B., Zimmermann, L., Jedmowski, C., Kleist, E., Pingle, V., Acebron, K., Zendonadi dos Santos, N., Steier, A., Freiwald, L., Munoz-Fernandez, I, Wilke, N., Kraska, T., Pieruschka, R., Schurr, U., Rascher, U. (2018). Field Phenotyping and an example of proximal sensing of photosynthesis under elevated CO2.  IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 22-27 July 2018, Valencia, Spain, 8252-8254.
  • Hehmann, D., Völkering, G., Kraska, T., Pude, R. (2017). Entwicklung von Torfersatzstoffen auf der Basis von Nachwachsenden Rohstoffen. Mitt. Ges. Pflanzenbauwiss., 29, 96-97.
  • Kraska, T., Hehmann, D., Kleinschmidt, B., Weinand, J., Pude, R. (2016). Nutzungsmöglichkeiten von Nachwachsenden Rohstoffen in erdelosen Kultursystemen. Mitt. Ges. Pflanzenbauwiss., 28, 178-179. [PDF Tagungsband]
  • Kuhn, A.J., Stollberg, M., Gossen, M., Förster, S., Kraska, T. (2016). Einfluss von HTC-Kohle auf das Pflanzenwachstum in Topfversuchen. Mitt. Ges. Pflanzenbauwiss., 28, 176-177. [PDF Tagungsband]
  • Winzer, F. Kraska, T., Pude, R. (2016). Einsparung von mineralischen Düngern durch die Nutzung regionaler Reststoffströme. Mitt. Ges. Pflanzenbauwiss., 28, 278-279. [PDF Tagungsband]
  • Kraska, T., Winzer, F., Witzel, C.P., Finger, R., Pude, R. (2015). Cascade Utilization of Miscanthus. Biobased Future (Mitteilungsblatt über Biomasse für Energie und Industrie in einer nachhaltigen Wirtschaft), No 4, July 2015, 13. [Online]
  • Winzer, F., Witzel, C.P., Kraska, T., Finger, R., Pude, R. (2015). Möglichkeiten der Kaskadennutzung von Miscanthus zur Erhöhung der Ressourceneffizienz. Mitt. Ges. Pflanzenbauwiss., 27, 23-24.
  • Hehmann, D., Kraska, T., Völkering, G., Pude, R. (2013). Nutzungsmöglichkeiten von mehrjährigen Biomassepflanzen als Torfesratz in Pflanzsubstraten. Mitt. Ges. Pflanzenbauwiss., 25, 253-254.
  • Kraska, T., Stewart, T. (2002). Diagnosis for Crop Protection - ein Planspiel in der phytomedizinischen Ausbildung. In: Blötz, H. (ed.). Planspiele in der beruflichen Bildung. Aktualisierter Planspielkatalog 2002 sowie Abriss zur Auswahl, Konzeptionierung und Anwendung von Planspielen. Multi Media Publication. Schriftenreihe des Bundesinstitut für Berufsbildung (BiBB). Bertelsmann Verlag, Bielefeld, Germany. Referenced in the apdated versions in 2008, 2015.
  • Hindorf, H., Kraska, T., Johnen, A, Thieron, M. (1999). Disease forecast systems optimising fungicide application in Germany with special reference to PRO_PLANT. In: Lyr, H., Russell, P.E., Dehne, H.-W., Sisler, H.D. (eds.). Modern Fungicides and Antifungal Compounds. 12th International Reinhardsbrunn Symposium, 24-29 May 1998, Friedrichroda, Germany. pages 69-73.
  • Kraska T. (1999). Plant Pathology and the Internet. In: Lyr, H., Russell, P.E., Dehne, H.-W., Sisler, H.D. (eds.). Modern Fungicides and Antifungal Compounds. 12th International Reinhardsbrunn Symposium, 24-29 May 1998, Friedrichroda, Germany. pages 69-73.
  • Schönbeck, F., Kraska, T. (1995): Induced resistance: Mechanisms and application.  3rd Conference of European Foundation for Plant Pathology on Environmental Biotic Factors in Integrated Plant Disease Control. 05-09 September 1995, Polish Acad. Sci, Sci Ctr, Poznan, Poland. pages 495-499.
  • Kraska, T., Schönbeck, F. (1993). About Changes in the Chromatin Structure after Resistance Induction in Hordeum vulgare L. Journal of Phytopathology 137(1):10 - 14. http://10.1111/j.1439-0434.1993.tb01320.x. Online on Researchgate (PDF)
  • Kraska T., Schönbeck F. (1993) Resistance Induction in Barley and the Influence on Genomic DNA Methylation. In: Fritig B., Legrand M. (eds) Mechanisms of Plant Defense Responses. Developments in Plant Pathology, vol 2. Springer, Dordrecht. pages 383-383.
  • Schönbeck, F., Steiner, U., Kraska, T. (1993). Induzierte Resistenz: Kriterien, Mechanismen, Anwendung und Bewertung. Induced resistance: Criteria, mechanisms, practical application and estimation. J. Plant Diseases and Protection, 100(5), 541-557. Online on Researchgate (PDF)
More publications can be found at ResearchGate


  • Petry, M., Pude, R., Kraska, T. (2018). Verfahren zur Herstellung eines Pflanzenbehandlungsmittels und Verfahren zur Behandlung von Pflanzen (DE 10 2017 000 110 A1 2018.07.12). Offenlegungsschrift vom 12.07.2018 Deutsches Patent- und Markenamt. Online verfügbar:
  • Skrobek, A., Dehne, H.-W., Kraska, T., Hintz, S., Sieverding, E., Busch, J. (2003). Composition containing fungus and polymeric additive, useful for controlling pests, e.g. insects on plants, has increased activity and stability (DE10148570A1). Offenlegungsschrift vom 10.04.2003 Deutsches Patent- und Markenamt. Online verfügbar:



  •  Aktuelle Entwicklungen in den Nutzpflanzenwissenschaften (B-A-P-10), Wintersemester, BSc Agrarwissenschaften
  • Agrar- und Ernährungsforschung (B-AE-O-01), Sommersemester, BSc Agrarwissenschaften, BSc Ernährungs- und Lebensmittelwissenschaften, BSc Ernährungs- und Hauswirtschaftswissenschaft LA BK
  • Tutorenpraktikum (B-AE-O-02), Winter- und Sommersemester, BSc Agrarwissenschaften, BSc Ernährungs- und Lebensmittelwissenschaften, BSc Ernährungs- und Hauswirtschaftswissenschaft LA BK
  • Projektseminar Nachwachsende Rohstoffe (B-A-O-03), Winter- und Sommersemester, BSc Agrarwissenschaften
  • Projektarbeit und Seminar zu Nachwachsenden Rohstoffen (Project module renewable resources) (MA-E-11-PM), Winter- und Sommersemester, MSc Nutzpflanzenwissenschaften (Crop Science)

Further details: Study programs of the Agricultural Faculty or contact me concerning modules I'm involved in.


BSc / MSc thesis

I am always on the lookout for highly self-motivated students, who are encouraged and passionate for science. You are invited to join into our research projects and you will be welcomed in our team. Feel free to contact me any time to find out which research topic suits you best.

If you are interested in a BSc or MSc thesis, please contact me.  A list of supervised BSc and MSc theses can be found here (browse through the list for TK).


Office Hours / Sprechstunde für Studierende

Ab sofort stehe ich Ihnen Online zur Verfügung. Schicken Sie mir eine kurze E-mail und Sie erhalten eine Einladung zu meiner Online-Sprechstunde. Natürlich stehe ich Ihnen auch gerne im Anschluss an einer meiner Lehrveranstaltungen oder nach persönlicher Vereinbarung zur Verfügung.

My Virtual Open Office: When I am in my office I will be online for from 10 am to 12 an you can meet me to talk and discuss about your studies, science and my research. Feel free to meet my an join into the conversation. I am just a CLICK away from you.



... from the past: my PhD research

During my PhD and also a short time after finishing my PhD I have worked on induced resistance in plants. During this research I have worked on possible effects of resistance inducers on DNA methylation. This work has beside my PhD thesis only partly been published. Very recently I have scanned my PhD thesis and the two publications on the topic to make it public.
Kraska, T. (1996). Vergleichende Untersuchungen von Resistenzinduktoren, deren Wirkungsweisen und dem EInfluß auf die DNA-Methylierung (Comparative investigations on resistance inducers, their mode of action, and effects on DNA Methylation). Diss. University of Hannover, Germany. Papierflieger, Clausthal-Zellerfeld, ISBN 3-931986-69-1. Online (2019): (open access)



... more about me

 Here you will find more about me in an uncategorized manner.