Dr. James P. Syvertsen (Jim)
Contact Information
Citrus Research and Education Center
Lake Alfred, Florida
Horticultural Science
Phone: 863.956.1151 ext. 1287
Email: jmsn@ufl.edu
Fax: 863.956.4631
Education
Ph.D. 1977, Biology. Physiological plant ecology of desert species. New Mexico State University, Las Cruces, NM.
B.A. 1970, Biology and M.A. 1973, Plant Ecology, California State Univ., Fullerton, CA.
Specialization
Environmental Stress Physiology of Citrus
Awards
2008-2011. University of Florida Research Foundation Professorship awarded from the UF Vice President for Research for “Distinguished Research Performance, Publications, Service and Commitment”.
Research
Research interests: Integration of citrus stress physiology. Effects of light, temperature, mechanical harvesting, drought, salinity, pests and nutrient stress on water, carbon and nutrient budgets of citrus. Response measurements include: Photosynthesis, root conductivity, leaf water relations, plant carbohydrates, canopy development, fruit yield, fruit shape and quality. Resource use efficiency, N leaching loses.
Refereed Publications
2008
Melgar, J.C., J.P. Syvertsen, and F. García-Sánchez. 2008. Can elevated CO2 improve the salt tolerance in ‘Koroneiki’ and ‘Picual’ olive tree cuttings? J Plant Physiology 165: 631-640. PDF
Melgar, J.C, J.P. Syvertsen, V. Martínez and F. García-Sánchez. 2008. Leaf gas exchange, water relations, nutrient content and growth in citrus and olive seedlings under salinity. Biol. Plantarum 52 (2): 385-390. PDF
Orbovic, Vladimir, J.P. Syvertsen, D. Bright, D. L. Van Clief & J.H. Graham. 2008. Growth of Citrus seedlings and their susceptibility to Phytophthora root rot are affected by PO^3 and PO^4 sources of phosphorus. J. Plant Nutrition 31: 774 - 787 PDF
Li, Kuo-Tan, J. Burns, and J. P. Syvertsen. 2008. Recovery from phytotoxicity after foliar application of fruit loosening abscission compounds to citrus. JASHS 133:
2007
Li, Hong, Stephen H. Futch and J.P. Syvertsen. 2007. Cross-Correlation Patterns of Air and Soil Temperatures, Rainfall and Diaprepes abbreviatus Root Weevil in Citrus. Pest Management Science 63: 1116-1123. PDF
Orboviƒ, Vladimir and J. P. Syvertsen. 2007. Adjuvants affect penetration of copper through isolated cuticles of Citrus leaves and fruit. HortScience 42:1405-1408. PDF
Pérez-Pérez, J.G., J.P. Syvertsen, P. Botía and F. García-Sánchez. 2007. Leaf water relations and net gas exchange responses of salinized Carrizo citrange seedlings during drought stress and recovery. Ann. Bot. 100: 335-345. PDF
Li, Hong, S.H. Futch, R.J. Stuart, C.W. McCoy and J. P. Syvertsen. 2007. Time series forecast and soil characteristics-based simple and multivariate linear models for management of Diaprepes abbreviatus root weevil in citrus. Soil Biology & Biochemistry 39:2436-2447. PDF
Syvertsen, J. P. 2007. Mechanisms of Root - Shoot Communication. HortSci. 42: 1101-1102. PDF
García-Sánchez, F., J.P. Syvertsen, P. Botía and J.G. Perez-Perez. 2007. Physiological Responses of Two Citrus Rootstock Seedlings to Flooding and Drought Stress. Physiologia Plantarum 130: 532–542. PDF
Hong Li, Stephen H. Futch, Robin J. Stuart, James P. Syvertsen, Clay W. McCoy. 2007. Associations of soil iron with citrus tree decline and variability of sand, soil water, pH, magnesium and Diaprepes abbreviatus root weevil: Two-site study. Environmental and Experimental Botany 59: 321–333 PDF
Hong Li, Clay W. McCoy, James P. Syvertsen. 2007. Controlling factors of environmental flooding, soil pH and Diaprepes abbreviatus (L.) root weevil feeding in citrus: Larval survival and larval growth. Applied Soil Ecology. 35: 553-565. PDF
2006
García-Sánchez, F. and J.P. Syvertsen. 2006. Salinity tolerance of Cleopatra mandarin and Carrizo citrange citrus rootstock seedlings is affected by CO2 enrichment during growth. J. Amer. Soc. Hort. Sci. 131: 24-31. PDF
Bondada, B.R., P.D. Petracek, J.P. Syvertsen and L.G. Albrigo. 2006. Cuticular penetration characteristics of urea in citrus leaves. Journal of Horticultural Science and Biotechnology 81:219-224. PDF
García-Sánchez, F., J. P. Syvertsen, V. Martínez and J. C. Melgar. 2006. Salinity tolerance of ‘Valencia’ orange trees grafted on contrasting rootstocks is not improved by moderate shade. J. Exp. Bot. 57:3697-3706. PDF
Li, Hong, J.P. Syvertsen, Clay W. McCoy, Robin J. Stuart, and Arnold W. Schumann. 2006. Water Stress and Root Injury from Simulated Flooding and Diaprepes abbreviatus Root Weevil Larval Feeding in Citrus. Soil Science 171: 138-151. PDF
Li, Hong, S.H. Futch, R.J. Stuart, J. P. Syvertsen and C.W. McCoy. 2006. Associations of soil iron with citrus tree decline and variability of sand, soil water, pH, magnesium and Diaprepes abbreviatus root weevil: Two-site study. Environmental & Experimental Botany, doi:10.1016/j.envexpbot.2006.04.005 PDF
Li, Hong, Clay W. McCoy and J. P. Syvertsen. 2006. Controlling factors of environmental flooding, soil pH and Diaprepes abbreviatus (L.) root weevil feeding in citrus: Larval survival and larval growth Applied Soil Ecology, doi:10.1016/j.apsoil.2006.09.013 PDF
2005
Syvertsen, J.P. and Y. Levy. 2005. Salinity Interactions with Other Abiotic and Biotic Stresses in Citrus. HortTech. 15: 100-103. PDF
Jifon, J.L., J.P. Syvertsen, and E. Whaley. 2005. Growth environment and leaf anatomy affect nondestructive estimates of leaf chlorophyll and nitrogen in Citrus sp. leaves. J. Amer. Soc. Hort. Sci. 130:152-158. PDF
Bondada, B. R. and J. P. Syvertsen. 2005. Concurrent changes in net CO2 assimilation and chloroplast ultrastructure in nitrogen deficient citrus leaves. Environ. & Exp. Bot. 54: 41-48. PDF
Li, Kuo-Tan and J.P. Syvertsen. 2005. Mechanical Harvesting has little effect on water status and leaf gas exchange in citrus trees. J. Amer. Soc. Hort. Sci. 130: 661-666 PDF
Yuan, R., F. Alferez, I. Kostenyuk, S. Singh, G. Zhong, J. Syvertsen and J. Burns. 2005. Partial defoliation can decrease average leaf size but has little effect on orange tree growth, fruit yield and juice HortSci. 40: 2011-2015. PDF
Syvertsen, J. P, L. G. Albrigo, M. A. Ritenour, J. M. Dunlop, A. W. Schumann, R. C. Vachon. 2005. Growth Conditions, Crop Load and Fruit Size Affect Sheepnosing in Grapefruit. FSHS Refereed 118: 28-34 PDF
2004
Levy, Y. and J. P. Syvertsen. 2004. Irrigation water quality and salinity effects in citrus trees. In: J. Janick (ed.). Horticultural Reviews vol 30: AVI Pub., Westport, CT. p. 37-82. PDF
Syvertsen, J. P. and J. Dunlop. 2004. Hydrophilic gel amendments to a sandy soil can increase growth and nitrogen uptake efficiency of citrus seedlings. HortSci. 39:267-271. PDF
Li, Hong, J. P. Syvertsen, R.J. Stewart, C.W. McCoy, A.W. Schumann and W.S. Castle. 2004. Soil and Diaprepes abbreviatus Root Weevil Spatial Variability in a Poorly Drained Citrus Grove. Soil Sci. 169: 650-662. PDF
McCoy, C. W, W. S. Castle, J. H. Graham, J. P. Syvertsen, A. W. Schumann, and R. J. Stuart. 2004. Pesticide Suppression of Diaprepes abbreviatus (L.) (Coleoptera: Curculionidae) Promoted Differential Growth and Survival of ‘Hamlin' Orange Trees Budded to Five Rootstocks in a Phytophthora Infested Grove. Proceedings of the Florida State Horticultural Society (Refereed) 117: 167-173. PDF
NON-Refereed Publciations (since 2004)
Syvertsen, J. P, L. G. Albrigo, M. A. Ritenour, J. M. Dunlop, A. W. Schumann, R. C. Vachon, R. R. Pelosi, and M. S. Burton. 2004. Growth Conditions Affect Sheepnosing in Grapefruit. Proceedings of the Florida State Horticultural Society. 117: 350-354.
Li, Hong, J. P. Syvertsen, C. W. McCoy, R. J. Stuart, and A. W. Schumann. 2004. Soil Liming and Flooding Effects on Diaprepes Root Weevil Larval Survival and Citrus Seedling Growth. Proceedings FSHS 117: 139-143.
Syvertsen, J. P. 2004. Shade effects on citrus leaf gas exchange, fruit yield, and quality. Proc. IX th Int. Soc. Citriculture. Agadir, Morocco.
Li, H., J.P. Syvertsen, R.J. Stuart, A. Schumann, C.W. McCoy, and W.S, Castle. 2004. Soil calcium, magnesium, and iron associated with root weevil distribution and citrus tree decline: a case study in Florida. Proc. IXth Int. Soc. Citric., Agadir, Morocco.
Li, Kuo-Tan and J. Syvertsen. 2004. Does Mechanical Harvesting Hurt Your Trees? Citrus Industry Magazine 85 (8): 30-33.
Buker, R.S., J.P. Syvertsen, J.K. Burns, F.M. Roka, W.M. Miller, M. Salyani, and G. Brown. 2004. Mechanical harvesting and tree health. EDIS..ifas.ufl.edu/HS199. 3 pp.
McCoy, C.W., W.S. Castle, J.H. Graham, R.J. Stuart, J.P. Syvertsen and A.W. Schumann. 2004. Foliar sprays reduce Diaprepes-induced tree injury. Citrus Industry Magazine 85(10): 23-25.
Buker, R.S., J.P. Syvertsen and L.G. Albrigo. 2004. How will the hurricanes affect next year's crop? Citrus Industry Magazine 85 (11): 17-19.
Syvertsen, J. P., R.S. Buker, L.W. Timmer and P. Stansly. 2004. Minimizing Hurricane Damage to Citrus Trees. Citrus & Vegetable Magazine. 69(1):24, 26, 28, 30, 34, 36.
Li, H., Syvertsen, J.P., Stuart, R.J., McCoy, C.W., Schumann, A.W., 2005. Delineating root weevil management zones in citrus using overlay patterns of soil organic matter content, electrical conductivity and Diaprepes adult population. In J. Mulla et al. (ed.), Proc. 7th Int. Conf. Precision Agriculture, ASA, CSSA, and SSSA, Madison, WI. p. 1962-1971.
Li, Kuo-Tan, J.P. Syvertsen, and Jacqueline Burns. 2005. Mechanical Harvesting of Florida citrus Trees has Little Effect on Leaf Water Relations or Return Bloom. Proc. FSHS. 118: 22-24. PDF
Albrigo, L.G., J. Attaway, K. Bowman, R.S. Buker, W.S. Castle, K.W. Hancock, C.W. McCoy, R.P. Muraro, M.E. Rogers, M.A. Ritenour, T. Spreen, P.D. Spyke, J.P. Syvertsen, L.W.Timmer and R.C. Vachon. 2005. The impact of four hurricanes in 2004 on the Florida Citrus Industry: Experiences and Lessons Learned. Proc. FSHS. 118: 66-74. PDF
Li, Kuo-Tan, J.P. Syvertsen, and Jill Dunlop. 2006. Defoliation After Harvest with a Trunk Shaker Does Not Affect Canopy Light Interception in Citrus Trees. Proc. FSHS. 119: (in press).
Li, Kuo-Tan, J.P. Syvertsen, and Jill Dunlop. 2006. Defoliation After Harvest with a Trunk Shaker Does Not Affect Canopy Light Interception in Citrus Trees. Proc. FSHS. 119: 187-189.
J. P. Syvertsen and F. García-Sánchez, V. Martínez, and J. C. Melgar. 2007. Shade Effects On Salinity Tolerance Of ‘Valencia’ Orange Trees On Contrasting Rootstocks. Proc. FSHS 120: 85-91.
J. C. Melgar, J. P. Syvertsen, V. Martinez and F. Garcia-Sanchez, 2007. The Relative Salt Tolerance Of ‘Rangpur Lime’ Seedlings And ‘Arbequina’ Olive Cuttings. Proc. FSHS 120: 79-84.
Schumann, AW, K.H. Hostler, J. C. Melgar and J.P. Syvertsen. 2007. Georeferenced Ground Photography of Citrus Orchards to Estimate Yield and Plant Stress for Variable Rate Technology. Proc. Fla. State Hort. Soc. 120:56–63. FSHS Best Paper Award. Citrus, 2007.
Ebel, R.C. K. Morgan, P.Newman, J. K. Burns, and J. Syvertsen. 2008. Interaction of Drought Stress and CMNP on Abscission of Oranges. Proc. FSHS 121:
Schumann, A.W. A.W., J.P. Syvertsen, and J.H. Graham. 2008. Microbial Soil Amendments do Little to Improve Citrus Tree Performance in Florida Soils. Proc. FSHS 121:
