Department of Horticultural Science
Dr. Gillman and his lab conduct research primarily at the eight-acre TRE nursery located on the St. Paul campus. This facility includes container production areas, field growing area, and Missouri gravel beds. Work is focused on improved nursery practices for maximizing growth and improving long term tree health in the urban environment. The effects of various planting techniques on root health is one of their major research thrusts, as is research on the root systems of trees grown in Missouri gravel beds (aggregate hydroponic systems using gravel). Investigating trees for urban settings, primarily elms, is another emerging area. They also research claims made by TV personalities and garden gimmick salesmen.
Gillman's research program focuses on applied nursery and landscape issues with particular attention to the root health of trees and shrubs. To find out more about the TRE nursery and its research, extension and teaching activities please click www.trees.umn.edu.
Dr. Gillman's extension program is focused primarily on consumer and urban horticulture. He works closely with the MNLA (Minnesota Nursery and Landscape Association), MTGF (Minnesota Turf and Grounds Foundation), and the MPRB (Minneapolis Park & Recreation Board).
Grabowski, M. A., D.C. Zlesak, and J.H. Gillman . Control of Black Spot on Rose., 2007 Fungicide and Nematicide Tests 62: V005. www.plantmanagementnetwork.org/pub/trial/pdmr/volume2/abstracts/ot005.asp
Kosola, K, B. A. A. Workmaster, J. S. Busse and J. H. Gillman. 2007. Sampling damage to tree fine roots: Comparing air excavation and hydropneumatic elutriation. 2007. HortScience 42(3): 728-731.
Weicherding, P. J., C. P. Giblin, J. H. Gillman, D. L. Hanson and G. R. Johnson. 2007. Mechanical root-disruption practices and their effects on correcting circling roots of pot-bound Tilia cordata Mill. and Salix alba L. ‘Niobe’. Arboriculture and Urban Forestry 33(1): 43-47.
Giblin, C. P., and J. H. Gillman. 2006. Substrate pH suppression using incorporated sulfur-based compounds in nursery container production. Journal of Environmental Horticulture 24(3): 119-123.
Smith, J.A., Blanchette, R.A., Burnes, T.A., Gillman, J.H. and A. David. 2006 Epicuticular wax and white pine blister rust resistance in resistant and susceptible selections of eastern white pine (Pinus strobus L.). Phytopathology. 96(2): 171-177.
Smith, J. A., R. A. Blanchette, T. A. Burnes, J. J. Jacobs, L. Higgins, B. A. Witthuhn and J. H. Gillman. 2006. Proteomic comparison of needles from blister rust-resistant and susceptible Pinus strobus seedlings reveals up-regulation of putative disease resistance proteins. Molecular Plant-Microbe Interactions 19(2): 150-160.
Zambrino, K., E. Hoover, N. Anderson, and J. H. Gillman. 2004. Writing across the curriculum: Where does horticulture fit in? HortTech. 14(4):1-4.
Gillman, J. H. 2003. A discussion format for improving critical thinking on issues affecting nursery management. NACTA Journal 47(4): 40-42.
Gillman, J. H., D. C. Zlesak and J. A. Smith. 2003. Applications of Potassium Silicate Decrease Black Spot Infection in Rosa hybrida ‘Meipelta’(Fuschia Meidiland TM). HortScience 38(6): 1144-1147.
Graham, A., J. H. Gillman, and C. J. Rosen. 2003. Lettuce growth and phosphorus leaching in media amended with phosphorus treated magnetite. Acta Horticulturae 627: 165-169.
Switras-Meyer, S. M. and J. H. Gillman. 2002. Antitranspirant treatments of stock plants do not alter growth and adventitious rooting of shoots of "Montaigne" lilac and white fringetree. Jour. Environ. Hort. 20(4): 240-244
Gillman, J. H. and C. P. Giblin. 2001. Growth Regulators and Irrigation Mitigate Competition Between Intercropped Grass and Fraxinus nigra ‘Fall Gold’. Jour. Environ. Hort. 19(4): 195-198.
Gillman, J. H. and D. C. Zlesak. 2000. Applications of Sodium Silicate to Rose (Rosa ´’Nearly Wild’) Cuttings Decreases Leaflet Drop and Increases Rooting. Hortscience 35(4): 773.
Gillman, J. H., M. A. Dirr and S. K. Braman. 1999. Gradients in susceptibility and resistance mechanisms of/ Buddleia /L/. /taxa to the two-spotted spider mite/ /(/Tetranychus urticae /Koch.). Journal of the American Society for Horticultural Science 124: 114-121.
Gillman, J. H., M. Rieger, M. A. Dirr and S. K. Braman. 1999. Effects of drought stress on two- spotted spider mite (/Tetranychus urticae/ Koch) populations affecting /Buddleia davidii/. HortScience 34: 280-282.
Gillman, J., M. A. Dirr and S. K. Braman. 1998. Effects of varying lime concentrations on growth and development of/ Buddleia davidii/. Jour. Environ. Hort. 16: 111-113.
Gillman, J. H. 2009. How Trees Die. Westholme Publishing, Yardley, PA.
Gillman, J. H. 2008. The Truth About Organic Gardening. Timber Press, Portland, Oregon.
Gillman, J. H. 2006. The Truth about Garden Remedies: What Works, What Doesn’t and Why. Timber Press, Portland, Oregon.
Gillman, J. H. 2008. The myths of plant propagation. In: B. Trigiano Ed. Plant Propagation Concepts and Laboratory Exercises. CRC Press.