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Scientists & Staff

Robert P. Long

Supervisory Research Plant Pathologist
Sustaining Forests in a Changing Environment
335 National Forge Road
Irvine, Pennsylvania 16329
Phone: 814-563-1040

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Featured Publications & Products

  • Long, Robert P.; Horsley, Stephen B.; Hall, Thomas J. 2011. Long-term impact of liming on growth and vigor of northern hardwoods. Canadian Journal of Forest Research. 41(6): 1295-1307.
  • Knight, Kathleen S.; Herms, Daniel A.; Cardina, John; Long, Robert; Gandhi, Kamal J.K.; Herms, Catharine P. 2011. Emerald ash borer aftermath forests: the future of ash ecosystems. In: McManus, Katherine A; Gottschalk, Kurt W., eds. 2010. Proceedings. 21st U.S. Department of Agriculture interagency research forum on invasive species 2010; 2010 January 12-15; Annapolis, MD. Gen. Tech. Rep. NRS-P-75. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 97.
  • Balci, Y.; Long, R.P.; Mansfield, M.; Balser, D.; MacDonald, W.L. 2010. Involvement of Phythophthora species in white oak (Quercus alba) decline in southern Ohio. Forest Pathology. 40: 430-442.
  • Knight, Kathleen S.; Herms, Daniel A.; Cardina, John; Long, Robert; Rebbeck, Joanne; Gandhi, Kamal J.K.; Smith, Annemarie; Klooster, Wendy S.; Herms, Catherine P.; Royo, Alejandro A. 2010. Emerald ash borer aftermath forests: The dynamics of ash mortality and the responses of other plant species. In: Michler, Charles H.; Ginzel, Matthew D., eds. 2010. Proceedings of symposium on ash in North America; 2010 March 9-11; West Lafayette, IN. Gen. Tech. Rep. NRS-P-72. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 11.
  • Knight, Kathleen S.; Long, Robert P.; Rebbeck, Joanne; Herms, Daniel A.; Cardina, John; Herms, Catherine P.; Gandhi, Kamal J.K.; Smith, Annemarie; Costilow, Kyle C.; Long, Lawrence C.; Cappaert, David L. 2010. Effects of emerald ash borer (Agrilus planipennis) on forest ecosystems. In: McManus, Katherine A; Gottschalk, Kurt W., eds. Proceedings. 20th U.S. Department of Agriculture interagency research forum on invasive species 2009; 2009 January 13-16; Annapolis, MD. Gen. Tech. Rep. NRS-P-51. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 82.

Publications & Products

National Research Highlights

Liming Effects Help Maintain Sugar Maple Growth and Health and Persist for More Than 20 years (2014)
Long-term inputs of acidic deposition have depleted soils of calcium (Ca) and magnesium (Mg) on ridge-top, unglaciated sites in Pennsylvania. Sugar maple requires adequate supplies of these elements to maintain growth, crown health, and flower and seed production. Soils sampled as part of a long-term liming study in northern Pennsylvania show that Ca and Mg levels have remained elevated through the soil profile to a depth of 1.5 feet for 21 years after an initial treatment with 10 tons per acre of dolomitic limestone.


Last updated on : 04-Aug-2015