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Dr. Elmi Lotze

???????Click to download: Curriculum Vitae?

Research:

Focus: sustainable improvement of plant and fruit quality

Initially my research endeavors focused on fruit quality (particularly fruit size) of apples via crop load, and investigated the impact of various environmental factors like winter chilling and spring temperatures on fruit size; this research was primarily funded through various Deciduous Fruit Industry programs. Of late, my research focus has adapted to three key areas: 1) plant nutrition, 2) climate and 3), root growth dynamics (Fig 1).?

????Elmis Fig 1.png

Plant Nutrition: 
I have now extended my field of expertise by investigating the role of nutrition on fruit quality, with special emphasis on the role of calcium (Ca) and boron (B).  My research findings convinced local producers to adapt their Ca-application protocols, which lead to a significant increase in fruit quality (les bitter pit) and with substantial higher volumes of fruit that could be delivered to the export market. My research on foliar applications of a Ca and B combination showed a significant reduction of class 1 sunburn in apples, whereby income is increased in susceptible cultivars when this practice is followed. International symposiums on Biostimulants in Agriculture provided sufficient evidence to include biostimulant-related projects into my teaching and research program, owing to the contributions of biostimulants to ensure sustainable, more environmental friendly agricultural practices. ?Exposure to the DST-NRF Center of Excellence in Food Security enabled me to accept the new challenge of alternative nutrient resource management to enhance soil fertility via liquid and solid waste products from anaerobic bio-digestion AB). AB also addresses sustainable practices and projects in this regard form an important area of training post graduate students in the Sustainable Agriculture program at the SU.?


Climate: 
Research projects with this focus include evaluation of drip vs micro irrigation, the reduction of sunburn and evaluation of mulches and cover crops in commercial orchards??


Root growth dynamics:
The role of roots in tree performance, water use and nutrient uptake is now another a major focus of research. By using a CID Root Scanner, we are able to quantify root growth dynamics non-destructively and in situ. This has resulted in various project pertaining the effect of soil applied treatments and so far involves studies on apple, citrus and maize crops. Collaboration with UP and the CSIR with regard to apple tree water use efficiency also involves root growth dynamics.?


Summary of research outputs: The following outputs emanated from my research:

  • 2005-2010: Five papers in peer-reviewed journals and 3 full length peer-reviewed papers in international conference proceedings

  • 2011-2015: Nine papers in peer-reviewed journals and 5 full length peer-reviewed papers in international conference proceedings

  • 2016 – current: Four papers in peer-reviewed journals and 2 full length peer-reviewed papers in an international conference proceedings ?


Teaching:

Teaching responsibilities and scope of teaching: Approximately 30 % of my time is devoted to pre-graduate teaching activities.  My teaching involvement includes:  i) Lecturing the topic 'Applied Plant Physiology in Mineral Nutrition (AP 464) at 4th year level to horticulture and agronomy students; ii) presenting selected orchard- and laboratory based practical classes to 3rd year horticultural students; iii) lecturing a small component of, and managing the Soil Health module within the MSc in Sustainable Agriculture program; and iv) training of postgraduate students in Horticultural Science and Sustainable Agriculture.

Teaching philosophy: It is important for our students to be empowered to have a holistic understanding of horticultural principles and to have the confidence to engage with producers, agro-companies and researchers alike on horticultural-based problems. Even if the exact topic is not familiar to them, they should have the ability to postulate and propose scientifically based solutions. I purposefully design challenging assignments and learning opportunities, based on the integration and application of knowledge, to prepare students to be able to deal with such situations effectively.?


Postgraduate supervision:

My involvement in supervision and co-supervision of postgraduate students increased over time and provide evidence of my standing as a supervisor/promotor:

  • 2005-2010: 2 MSc Agric students;
  • 2011-2015:  7 MSc Agric students  and 1 Postdoctoral fellow;
  • 2016 – Current: 20 MSc Agric students and 4 PhD students.


My students for part of a study group where we also address the development of student attributes with reference to time management, presentation skills, planning and organising skills. ?


Postgraduate Research Students:

Completed MSc Agric theses:

 

1. J Joubert: MSc Agric thesis (co-supervisor) -The effect of different water and nutrient management strategies on the Ca content of apple fruit. Supervisor: Dr P.J.C. Stassen 2007

2. C.J. Kapp: MSc Agric thesis (co-supervisor) - Manipulation of the chilling requirement of sweet cherry trees. Supervisor: Dr N.C. Cook 2008

3. B. Makeredza: MSc Agric thesis (co-supervisor) -Mulching decreases while moisture stress increases sunburn development in apples. Supervisor: Dr W.J. Steyn 2012

4. P. Carmichael: MSc Agric thesis (supervisor) - Predicting optimum harvest time and eating quality of Forelle pears. 2010

5. R.W. Wilsdorf: MSc Agric thesis (supervisor) - Seasonal changes in concentration and distribution of Ca2+ in apple fruit after soil and foliar calcium applications. 2011

6. W.P. Kotze: MSc Agric thesis (supervisor) - Effect of mulches on fruit quality of Cripps' Pink apples. 2012

7. J.P.D. van der Merwe: MSc Agric thesis (supervisor) - Quantifying the effect of inorganic and organic mulches of 2 soil types on nutrient uptake and fruit quality of 'Cripps' Pink' apples. 2012

8. A.F. Nicholson: MSc Agric thesis (supervisor) - An investigation into factors in the root environment that affect growth and development of roots and the influence of ground covers on these factors. 2012

9. D.T. Hendricks: MSc Agric thesis (supervisor) - Determining the effect of applied salicylic acid and silica on systemic acquired resistance on fruit growth and quality. 2012

10. L. Butler: MSc Agric thesis (co-supervisor) -'Cripps' Pink' browning as influenced by pre-harvest factors. Supervisor: Dr E.M. Crouch. 2015

11. F.J. van Zyl: MSc Agric thesis (supervisor) - Apple root growth dynamics and fertilizer uptake. 2016

12. S. Kafula: MSc Agric thesis (supervisor) - The effects of different waste management strategies utilising dairy manure, food and fruit waste on the biogas production as a sustainable source of renewable energy. 2016

13. I. Kritzinger: MSc Agric thesis (co-supervisor) - A study of broken stones in plums. Supervisor: Dr M.M. Jooste. 2016

14. S.H. Daiber: MSc Agric thesis (supervisor) - Quantifying changes in tree physiology after amelioration to reduce sunburn on apples. 2017

?15. M. Frazenburg: MSc thesis (co-supervisor) - Determining the time of formation of primary xylem and the effect thereof on Ca distribution in the dormant reproductive apple bud. Supervisor: Prof L. Dreyer. 2017

16. Q. Doko: MSc Agric thesis (co-supervisor) Modelling canopy conductance and water use of high yielding apple orchards. Supervisor: Dr N.J. Taylor 2018

17. E. le Roux: MSc Agric thesis- Investigating the effect of Metalosate Ca on fruit quality of apples and citrus. 2018

18. L. Jansen van Vuuren: MSc Agric thesis - Quantifying the effect of Black Urea? / Black DAP? application as alternative nitrogen source on fruit tree physiology, yield and fruit quality of an apple. 2018

19. P. Jordaan: MSc Sustainable Agric thesis – Evaluating the potential of the biogas industry in South Africa. 2018

20. R. Andrews: MSc Sustainable Agric thesis – Investigating the use of biodigestate as   alternative source of mineral nutrients in aquaponics. 2018


Current dissertations:

1.    B. Makeredza: A study of photo-thermal and pitburn damage in Japanese plums. Promoter: Prof W.J. Steyn

2.    A. Mwije: A study of the dynamics of sunburn reduction in apple (Malus domestica) using foliar applications of a combination of boron and calcium

3.    F.S. Zirebwa: Establishing quantitative relationships between water relations, yield and quality of high performing commercial apple orchards in the winter rainfall area of South Africa. Promoter: Prof S.J.E. Midgley

4.    I. Kritzinger: Study of the peel permeability of Japanese plums to moisture during fruit development on the tree.?


Current theses:

1. I. Zurayk: MSc Agric thesis (co-supervisor) - Fertilization management of crops under NaCl fertigation induced salinity stress. Supervisor: Dr E.W. Hoffman

2.        V. van Niekerk: MSc Agric thesis (Sustainable Agriculture) (co-supervisor) – The effect of increased animal densities on chemical, physical and microbiological characteristics in soil in the MZimbubu catchment, South Africa. Supervisor:Dr H. Hawkens

3.        A. Cameron: MSc Agric thesis - Quantifying the uptake as well as the allocation/distribution of Ca to different plant organs after a Ca soil application during the second white root flush in young potted apple trees.

4.          C. Shereni : MSc Agric thesis - Investigating an alternative approach to fruit and tree quality management

5.          P. Micklem: MSc Agric thesis - Increasing the yield of Wichita pecan trees by manipulating tree size and/or shape

6.          M. Webber:  MSc Agric thesis - Evaluating plant performance and nutrient uptake in deciduous fruit after soil fumigation under replant conditions, using alterative fumigants and biostimulants

7.          E. Jansen van Rensburg: MSc Agric thesis- Investigating tree performance of young, non-bearing Kanzi/m9 irrigated by micro jet or drip irrigation during establishment

8.          S.  Oosthuizen: MSc Agric thesis (co-supervisor) - Carbon partitioning in low chill peach cultivars: the impact on yield in summer rainfall areas of South Africa. Supervisor: Dr N.J. Taylor

13.   C. Wilson: MSc Agric thesis (co-supervisor) - Determining the active root growth and carbohydrate production in roots from soils of from different climatic conditions, tree age and altitudes Supervisor: Dr N.J. Taylor

14.   T. J. Snyman: MSc Agric thesis - Increasing fruit set in Pecans

15.    R Dedekind: MSc Agric thesis – Increasing vegetative breaks in Pecans

16.    J. Davenport: MSc Sustainable Agric thesis – Re-visit the role of mulching in perennial commercial orchards.?


Post doctoral candidates:

Dr S.S. Turketti: Evaluation of fruit quality – specifically lenticel break-down in apples and calcium concentration in tomatoes and apple tissues.?



Publications & presentations:

?
Peer-Reviewed Scientific Journals

  • ?Lotze, E. & Hoffman, E.W., 2014.  Combined foliar application of calcium and boron reduces sunburn in 'Golden Delicious' apples'. Jnl Hort Sci Biotech 89(6): 607-612.?

  • Lotze, E. &Turketti, S., 2014. Efficacy of foliar application of calcium products on tomatoes as defined by penetration depth of and concentration within fruit tissues. J Pl Nutr. (accepted and in press)
  • Lotze, E., R.E. Wilsdorf & Turketti, S., 2014. Revisiting Ca concentration and distribution in apple fruitMalus Domestica) : Comparing transverse results from PIXE, SEM and destructive mineral analyses. J Pl Nutr. (accepted and in press)
  • L?tze, E. and Hoffman, E.W., 2014. ?Combined foliar application of calcium and boron reduces sunburn in 'Golden Delicious' apples' by. J. HortBiol (accepted and in press)
  • Makeredza, B., Schmeisser, M., L?tze, E.,  Steyn,W.J., 2013. Water Stress Increases Sunburn in 'Cripps' Pink' Apple. HortScience 48(4):444–447.
  • Turketti, S.S., Curry, E. & L?tze, E., 2012. Role of lenticel morphology, frequency and density on incidence of lenticel breakdown in 'Gala' apples. Sci Hort., 138, 90-95.
  • L?tze,E.,Conradie, P., Bergh,O.,  2012. Evaluating the Streif Index against commercial subjective predictions  to determine harvest date of apples in South Africa. (South African Journal of Plant and Soil 29(2), 53-56)       
  • L?tze, E., Joubert, J.  & Theron, K.I., 2008. Evaluating pre-harvest foliar calcium applications to increase fruit calcium and reduce bitter pit in 'Golden Delicious' apples. Sci. Hort. 116, 299-304.
  • L?tze, E., Sadie, A. & Theron, K.I., 2007. Increasing the efficiency of pre-harvest Ca application for bitter pit control in 'Golden Delicious' apples under South African conditions. Jnl Plant Nutr. 30:471-485.
  • L?tze, E., Sadie, A. & Theron, K.I., 2006. Determining bitter pit probability in 'Golden Delicious' through post harvest mineral content of individual fruit. Jnl HortSci Biotech 81 (2), 276-280.
  • L?tze, E., Huybrechts, C., Theron, K.I. & Valcke, R., 2006. Investigating Fluorescence Imaging as Non-destructive Method for Pre-harvest Detection of Bitter pit in Apple Fruit (MalusdomesticaBorkh). Jnl Postharvest Biol Tech, 40(3), 287-294.
  • Nicola?, B.M., L?tze, E., Peirs, A., Scheerlinck, N. & Theron, K.I., 2006.Non-destructive measurement of bitter pit in apple fruit using NIR hyperspectral imaging. Postharvest Bio. Tech. 40, 1-6.
  • L?tze, E. & Bergh, O., 2004.Early prediction of harvest fruit size distribution of an apple and pear cultivar. SciHort, 101, 281-290.
  • Greybe, E., Bergh, O. & Ferreira, D.I., 1998. Fruit growth and cell multiplication of Royal Gala apples as a function of temperature. Appl Pl Sci., 12(1), 10-16.

 

Publications in Acta Horticulturae following presentations/posters

  • L?tze, E. & Bergh, O., 1998. The effect of winter chilling on cell division and multiplication pre-anthesis and thus on final fruit size of Royal Gala apples in South Africa. Proc XXV IHC Brussels, Belgium Aug 1998. Acta Hort 519:113-120. (Poster)
  • L?tze, E. & Bergh, O., 2005.  Early prediction of ripening and storage quality of pear fruit in South Africa. Pear conference, Stellenbosch, South Africa, February 2004. Acta Hort 671, 97-102 (Presentation).
  • Bergh, O. & L?tze, E., 2006.Mid-season prediction of fruit size distribution of 'Golden Delicious' apples in South Africa.7th Modelling symposium, Copenhagen, Denmark, June 2004. Acta Hort 707, 217- 222 (Presentation)
  • L?tze, E. & Theron, K.I., 2006.  Dynamics of Calcium uptake with pre-harvest sprays to reduce bitter pit in Golden Delicious.5th International symposium on mineral nutrition of fruit plants. Acta Hort 721, 313-319.
  • Marcos, T, L?tze, E, Theron, K.I. & Jacobs, G., 2008. Improving the Prediction Model for Harvest Maturity of 'William's Bon Chretien' Pears.  7th ISHS Modelling symposium, 2-6 July 2007, Einsedln, Switzerland. Acta Hort. 803,273-282
  • L?tze, E., Joubert, J.  & Theron, K.I., 2008. Assessment of pre-harvest physiological infiltration methods for predicting commercial bitter pit in 'Braeburn' and 'Golden Delicious'.19-23 May 2008, Faro, Portugal. (Presentation)
  • Midgley, S.J.E. & L?tze, E. 2009. Historical and future impacts of warming on chill unit accumulation in the Western Cape.  SASHS Stellenbosch Jan 2009. (Presentation)
  • L?tze, E., Conradie, P.  & Theron, K.I., 2009. Factors contributing to the development of lenticel break down in 'Royal Gala'. SASHS Stellenbosch Jan 2009. (Presentation)
  • L?tze, E. and Kotze, W.P., 2010.Pre-harvest management of fruit quality with emphasis on efficient nutrient uptake and distribution to the fruit. Workshop: Oman - South Africa scientific &technical bilateral cooperation program. Integrated approaches to fruit production and postharvest management in arid climates. May 29-31, 2010. (Proceedings)
  • L?tze, E., Joubert, J.  & Theron, K.I., 2010. Assessment of pre-harvest physiological infiltration methods for predicting commercial bitter pit in 'Braeburn' and 'Golden Delicious'.19-23 May 2008, Faro, Portugal. Acta Hort. 868,347-351.
  • L?tze, E., Sadie, A. &Theron, K.I., 2011. Development of a Pre-harvest Prediction Model for Ripening of 'Forelle' Pears (Pyrus communis).XI International Pear Symposium, November 23-26, 2010, Neuquen, Argentina (Presentation). Acta Hort.909:  693-969
  • Midgley, S.J.E. and L?tze, E., 2011. Climate change in the Western Cape of South Africa: Trends, projections and implications for chill unit accumulation. Acta Hort. 903, 1127-1134
  • Turketti, S.S., L?tze, E., 2013. Evaluation of two biostimulants (Vermi paste and seaweed extract) on transplant shock and growth performance of potted tomato plants cv 'Money Maker'. SASHS Combined congress, 21-25 Jan 2013.Durban.
  • Kotze, W.P.,Van der Merwe, J.D.P.,Nicholson, A.F, Schmeisser, M., Taylor, N.J.and L?tze, E.,  2013. Changes in Phosphorus status of 'Cripps' Pink'apple trees after application of mulches.  II International Symposium of Organic Matter Management & Compost Use in Horticulture in Santiago, Chile from 21-24th of October 2013. Acta Hort in press
  • Wilsdorf, R.E., L?tze, E., Mesjasz-Przybylowicz, J., Przybylowicz, W.J., 2013. Mapping the distribution of calcium on apple tissue with proton-induced x-ray emission - after applicaion of additional pre-harvest foliar or soil calcium. Acta Hort 984: 347-355.
  • L?tze, E. and Kotze, W.P., 2014. The effect of organic and inorganic mulches on soil environment, root development and nutrient uptake of mature apple trees.  International Symposium on Organic Matter Management and Compos Use in Horticulture.  Adelaide, Australia March 2011. Acta Hort 1018: 391-400.

 

Invited speaker / Presentations

Invited speaker international

  • L?tze, E.,2009.  Mechanisms for Ca uptake in apple trees (Mecanismos de calcio).XV International symposium on apples, 4-6 Nov 2009. Cd Cuauthemoc, Chih., Mexico.
  • L?tze, E., 2009.  Application of foliar Ca to apple trees to reduce Bitter pit and increase fruit quality (Aplicaciones de calcio). XV International symposium on apples, 4-6 Nov 2009.Cd Cuauthemoc, Chih., Mexico.

 

Presentations International

  • L?tze, E., Huybrechts, C., Theron, K.I. & Valcke, R., 2003. Gebruik van fluorescentiebeeldanalysevoor-oogstperiode - voorvoorspelling van bitterpit .LUC-werkswinkel, Diepenbeeck, Belgium March 2003.
  • L?tze, E.,Peirs, A., Theron, K.I. & Nicolai, B.M., 2006. NIR-spectroscopy: a non-destructive prediction of bitter pit pre?harvest. SASHS, Stellenbosch, South Africa, 29th May 2006. (Presentation).
  • L?tze, E., 2007. Introduction and focus areas of the department of Horticultural Science at the 中国体育彩票 of Stellenbosch.ValentBioSciences, Chicago, 10th August 2007.
  • L?tze, E., 2007. Introduction and focus areas of the department of Horticultural Science at the 中国体育彩票 of Stellenbosch.  WSU, Wenatchee, 14th August 2007.
  • L?tze, E., Joubert, J.  & Theron, K.I., 2008. Evaluating pre-harvest foliar calcium applications to increase fruit calcium and reduce bitter pit in 'Golden Delicious' apples. SASHS, Graham's Town, South Africa, 21-24 Jan 2008.p65. (Presentation)
  • L?tze , E. and Bergh, O., 2011.Developing a prediction model for seasonal harvest volumes for the peach preserve industry in South Africa. IXth International Symposium on Modelling in Fruit Research and Orchard Management in Saint-Jean-sur-Richelieu from 19 to 23 June 2011.

 

Presentations national

  • L?tze, E. & Bergh, O., 2002. Early prediction of fruit size distribution of apples at harvest. CPA May 2002.
  • L?tze, E. & Bergh, O., 2003.  Vroe? voorspellings van rypwording en opbergingskwaliteit van kernvrugte. KPV Mei 2003.
  • L?tze, E., Joubert, J.  & Theron, K.I., 2006.  Timing of foliar Calcium (Ca(NO3)2) applications pre-harvest for reduction bitter pit in Golden Delicious.  Yara field day, 2th August 2006, Vyeboom, South Africa.
  • L?tze, E., Joubert, J.  & Theron, K.I., 2006.  Efficiency of Pre-harvest Ca sprays to reduce bitter pit in Golden Delicious.  CPA field day, Elgin October 2006.
  • L?tze, E., Joubert, J.  & Theron, K.I., 2007.  Efficiency of Pre-harvest Ca sprays to reduce bitter pit in Golden Delicious.  UAP training day, Paarl 21st June 2007.
  • L?tze, E., 2007.The ABC of conducting boereproewe. CPA Technical Symposium 21 November 2007.
  • L?tze, E., 2009. Ca bestuur van bitter pit by Golden Delicious. Nexus program vir wingerd- en vrugte    opleiding.27-29 Mei 2009. Paarl.
  • L?tze, E., 2010. Toediening van Ca om die [Ca] in vrugte te verhoog en bitterpitvoorkoms in appels te verlaag. Yaraopleiding, Paarl, Maart 2010.
  • L?tze, E.,2010. Invloed van klimaatsfaktore op normale fisiologiese prosesse. Terason sagtevrugteopleiding, Wellington, 3 Junie 2010.
  • L?tze, E., Wilsdorf, R.E. and Britz, A., 2010. Seasonal changes in concentration and distribution of Ca2+ in apple fruit after soil and foliar calcium applications.Stellenbosch, Yara navorsingsterugvoering 9 Junie 2010.
  • L?tze, E. and Kotze, W.P., 2010. The influence of mulches on efficiency of nutrient uptake and distribution to apple fruit. Navorsingsterugvoering Lourensford Estate, June 2010.
  • P.C. Carmichael, K.I. Theron, E. M. Crouch, E. L?tze, 2011.Evaluation of maturity indices and their rates of change to predict optimum harvest maturity of 'Forelle' pears. SASHS, 17-20 Jan 2011. Pretoria.
  • W. P. Kotze, M. Schmeisser, E. L?tze, 2011. Effects of mulching with emphasis on factors influencing soil fertility, plant nutrition and fruit quality.SASHS, 17-20 Jan 2011. Pretoria
  • Wilsdorf, R.E., Mesjasz-Przybylowicz, J., Przybylowicz, W.J., & L?tze, E., 2011.Mapping the distribution of calcium in apple tissue with proton-induced x-ray emission – after application of additional foliar or soil calcium.SASHS, 17-20 Jan 2011. Pretoria.
  • E. L?tze, P.Conradie, O.Bergh, 2011. Evaluating the Streif Index against commercial subjective predictions to determine harvest date of apples in South Africa.SASHS, 17-20 Jan 2011. Pretoria.
  • R.E. Wilsdorf, J. Mesjasz-Przybylowicz, W.J. Przybylowicz, E. L?tze, 2011.  Mapping the distribution of calcium in apple tissue with proton-induced X-ray emission – after application of additional foliar or soil calcium. Post Graduate Symposium. iThemba LABS, Somerset West. 1 June 2011.
  • E. L?tze, 2011. Reserve status of fruit trees. Innofruit.Vyeboom. 5 May 2011.
  • E. L?tze, 2011. Advances in Ca application in deciduous fruit production. FSSA Annual Congress. Somerset West. 2 June 2011.
  • E. L?tze, 2011. Holistic approach to Ca application. Terason sagtevrugteopleiding, Wellington, 3 June 2011.
  • L?tze, E., Kotze, WP, 2011.Pre-harvest management of fruit quality (emphasis on efficient nutrient uptake and distribution to the fruit) Fieldmen's meeting 5th Aug 2011, Stellenbosch.    
  • L?tze, E., Kotze, WP, Nicholson, A, Van der Merwe, PW, 2011. Pre-harvest management of fruit quality after application of mulches. Kromco technical information day,29 Nov 2011, Elgin.
  • L?tze, E., Kotze, WP, Nicholson, A, Van der Merwe, PW,2012. Choosing mulches: Horses for courses. Fruitgro Science Technical Symposium 2012, 6th June, Spier, Stellenbosch.
  • L?tze, E., 2012. Foliar Ca applications on Tomatoes & GD. Nexus Kern- en steenvrugteopleiding. 14 Junie 2012. Bayerlokaal, Paarl.
  • L?tze, E., 2013. Rol van Ca by beheer van bitterpit in appels. 12 Des 2013. Terason besprekingsgroep. Ideafruit, Vyeboom.
  • L?tze, E., 2014. Role of mulches in irrigation of deciduous crops. Agrimotion Short Course, 6 Aug 2014, Somerset West.

 

Posters presented

International

  • North, M., L?tze, E. and Joubert, J., 2007. Do adjuvents and application date of calcium nitrate sprays effect 'Golden Delicious' apple fruit calcium and nitrogen concentration? IAAS August 2007, Columbus, Ohio.
  • Midgley, S.J.E. and L?tze, E. 2008. Climate Change in the Western Cape of South Africa: Trends, Projections and Implications for Chill Unit Accumulation.9th International Symposium on Integrating Canopy, Rootstock and Environmental Physiology in Orchard Systems, Geneva, New York, USA. 2 – 9 Aug 2008.
  • L?tze, E. and Theron, K. I., 2009. Investigating factors contributing to the development of lenticel break down in 'Royal Gala' apples in South Africa. ASHS July 2009 St Louis Missouri, USA
  • L?tze, E. and GFA L?tze, 2011.Applying a growing degree hour model from California to predict fruit size of canning peaches in South Africa.IXth International Symposium on Modelling in Fruit Research and Orchard Management in Saint-Jean-sur-Richelieu from 19 to 23 June 2011.
  • L?tze, G.F.A., Pieterse, E., Wilding, M., Van Kerwel, W. and L?tze, E., 2013. Utilising laboratory apple waste for composting. ISHS IInd International Symposium of Organic Matter Management & Compost Use in Horticulture in Santiago, Chile from 21-24th of October 2013.
  • L?tze, E. & Steyn, W.J., 2014.Quantifying differences in growth selected apple rootstocks under extreme simulated spring temperatures in environmental chambers.ISHS International Symposium on Physiological Principles & their application to fruit production. Geneva, New York, USA 26-28th of March 2014.

 

National

  • ??Huybrechts, C., L?tze, E. & Theron, K.I. &Valcke, R., 2002.  Fluorescence imaging of physiological disorder of apple fruit. CPA May 2000. (Poster)


Popular Articles

  • Greybe, E. & Van Wyk, D., 1997.  Klimaatsdata'n handige boerdery hulpmiddel. Sagtevrugteboer (SVB) Feb 1997, 62-63.
  • Greybe, E., 1997.  Koue-eenhede  handige hulpmiddel om kwellings te voorkom. SVB Jul., 1997, 250-251.
  • Greybe, E., 1997.  Reduced chemical application possible with new prediction model. Deciduous Fruit Grower (DFG) Nov 1997, 431.
  • Greybe-L?tze, E., 1999.  Introduction to chill unit models. DFG Aug 1999, 14-17.
  • Greybe-L?tze, E. & Bergh, O., 1999. Praktiese benutting van groeikrommes tydens handuitdunning.  SVB Des 1999, 4-5,16.
  • L?tze, E., 2001.Opti-size: can a grower afford not to use this opportunity. DFG Oct 2001, 51.
  • L?tze, E. & Bergh, O., 2003.  Fruit growth curves and weekly tables for 'Fuji' and Cripps' Pink' under Western Cape conditions. SA Fruit Jnl Dec/Jan 2003, 16-20.
  • L?tze, E. & Theron, K.I., 2003. Bitterpit by Golden Delicious appels: 'n opname onder sagtevrugteprodusente in die Wes-Kaap.  SA Fruit Jnl Aug/Sep 2003, 15-18.
  • L?tze, E. & Bergh, O., 2004. Summary of the quality prediction project results for 2003/04 for pome fruit. SA Fruit Jnl Okt/Nov 3:5 28-29.
  • L?tze, E., 2006.Identification of bitter pit in apples. Brochure for DFPT Research.
  • L?tze, E. & Theron, K.I., 2006.Existing Pre-harvest Predictions Methods and Models for Bitter Pit Incidence: an abstract.  Brochure for DFPT Research.
  • L?tze, E. & Theron, K.I., 2006.Existing Pre-harvest Predictions and Models for Bitter Pit Incidence.SA Fruit Jnl, July 18-25.
  • L?tze, E., North, M. &Joubert, J. 2007. Adjuvants and application date of calcium nitrate sprays effect 'Golden Delicious' fruit calcium concentration.SA FrJnl.  Dec 07/Jan 08. 6(6) 22-25.
  • Curry, E., Schrader, L.E., Hanrahan, I., L?tze, E., 2008. Lenticel related disorders. S.A. Fr. Jnl, 6(6), 15.
  • L?tze, E. and Theron, K. I., 2009. Investigating factors contributing to the development of lenticel break down in 'Royal Gala' apples in South Africa. S.A. Fr. Jnl., 8(6). 67-68
  • L?tze, E., 2012. Opinion : How to ensure calcium intake for good fruit. FreshFruitPortal.com. The voice of the Southern Hemisphere. July 25, 2012/ Week N° 30.
  • L?tze, E., Bergh, O., 2012. Are chilling units still relevant for the SA fruit industry. Fresh Notes. A Technical update published by Fruitgro science. 64 : July 2012.
  • L?tze, E., Bergh, O., 2012. Are chilling units still relevant for the SA fruit industry. SA FR Jnl 11(4) 65-66.
  • L?tze, E., 2012. A comparison between two, locally produced seaweed biostimulants regarding nutrient and alginic acid composition and biological rooting response.SA Fr Jnl 11(4) : 70-72.
  • Turketti, S. and  L?tze, E.,  2013. Visual identification of damage associated with lenticels in apples after cold storage. SA Fr Jnl 12(2) Apr/May 63.

 

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2013  RSG : Ekoforum : Die maak van kompos

 

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