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L.J. Grauke
Research Horticulturist, USDA-ARS Pecan Breeding & Genetics
Curator, National Clonal Germplasm Repository for Carya
Route 2 Box 133
Somerville, TX 77879
tele 979-272-1402 fax 979-272-1401 e-mail ljg@tamu.edu

L.J. Grauke received his Bachelor of Arts from the Plan II program, University of Texas-Austin in 1973. He received his Master of Science and Doctor of Philosophy from the Department of Horticulture, Texas A&M University in 1978 and 1982, respectively. Dr. Grauke was Associate Professor of Horticulture at Louisiana State University, working at the Pecan Research-Extension Station, Shreveport, La. prior to accepting the position as Research Horticulturist with USDA-ARS in 1988. He became a member of the graduate faculty at Texas A&M University in December, 1990.

Dr. Grauke is Curator of the National Clonal Germplasm Repository (NCGR) for Pecans and Hickories. The Repository is dedicated to the collection, maintenance and characterization of world genetic resources of the Carya genus. Research includes practical aspects of species identification, designation, distribution, site adaptation, phenology, and relationships with associated insects and diseases.

Dr. Grauke is Research Horticulturist for the USDA-ARS Pecan Breeding & Genetics program. The major objective of that program is the development of improved pecan cultivars and rootstocks for all U.S. production areas. Controlled crosses are made using selected parents, and the resulting seedlings are carefully evaluated in nursery orchards. Individuals with outstanding performance are propagated in replicated test orchards where they are compared to standard pecan cultivars. These test orchards, known as the National Pecan Advanced Clone Testing System (NPACTS), form a national system of research orchards in which routine observations are made concerning growth, phenology, disease and insect resistance, nut production and nut quality. In addition to the routine evaluation of selections under test, research is also conducted for the improvement of selection criteria using standard field observations and molecular genetic techniques.

 

SELECTED PUBLICATIONS

Grauke, L. J., M. J. Iqbal, A. S. Reddy, , and T. E. Thompson. 2003. Development of Microsatellite DNA Markers in Pecan. J. Amer. Soc. Hort. Sci. 128(3):374-380.

Grauke, L. J. and T. E. Thompson. 2003. Rootstock development in temperate nut crops. Proc. XXVI IHC Genetics and Breeding of Tree Fruits and Nuts. (ed.) J. Janick. Acta Horticulturae 622, pp. 553-566.

Grauke, L. J., H. J. Price, and J. S. Johnston. 2001. Genome size of pecan determined by flow cytometry. HortScience 36:814.

Mendoza-Herrera, M. A., L. J. Grauke, and C. A. Loopstra. 2000. Optimization of microsatellite methodologies for the analysis of pecan variation. Plant and Animal Genome VIII Conference. San Diego, CA. Jan. 9-12,

Lu, Anmin, Donald E. Stone, and L. J. Grauke. 1999. Juglandaceae. p 277-285. In Wu, Z. Y. and Raven, P. H. (eds) Flora of China, Volume 4, Cycadaceae through Fagaceae. Co-published by Science Press (Beijing) and Missouri Botanical Garden Press (St. Louis).

Grauke, L. J. 1998. Managing rootstocks. p 90-101. In D. McCraw, M. W. Smith, and Wm. Reid, (eds.). Pecan Industry: Current situation and future challenges. 3rd National Pecan Scientists Workshop. U. S. Department of Agriculture, Agricultural Research Service, ARS-1998-04.

Grauke, L. J., Tommy E. Thompson, E. F. Young, Jr., and H. D. Petersen. 1998. The effect of year, cultivar, location and storage regime on pecan kernel color. J. Amer. Soc. Hort. Sci. 123:681-686.

Wood, B. W., L. J. Grauke, and J. A. Payne. 1998. Provenance variation in pecan. J. Amer. Soc. Hort. Sci. 123:1023-1028.

Grauke, L. J. and Tommy E. Thompson. 1996. Pecans and Hickories. Chapter 4, p 185-239. In: Jules Janick and James N. Moore (eds.) Fruit Breeding, Volume III: Nuts. John Wiley & Sons, Inc.

Grauke, L. J. and Tommy E. Thompson. 1996. Variability in pecan flowering. Fruit Varieties Journal 50:140-150.

Grauke, L. J. and Richard D. O'Barr. 1996. Initial survival of pecan grafts on seedling rootstocks of pecan, water hickory and their interspecific hybrid. HortTechnology 6:45-48.

Grauke, L. J., Tommy E. Thompson, and Robert D. Marquard. 1995. Evaluation of pecan [Carya illinoinensis (Wangenh.) K. Koch] germplasm collections and designation of a core subset. HortScience 30:950-954.

Grauke, L. J. and Tommy E. Thompson. 1995. Rootstock Development. p. 167-175. In: Michael Smith, Wm. Reid, and Bruce Wood (eds.) Sustaining Pecan Productivity Into the 21st Century. Second National Pecan Workshop Proceedings. Wagoner, OK. July 23-26, 1994. United States Department of Agriculture, Agricultural Research Service 1995-3. 195 p.

Thompson, Tommy E., L. J. Grauke and J. Benton Storey. 1995. 'Navaho' pecan. HortScience 30:156-157.

Marquard, Robert D., L. J. Grauke, Tommy E. Thompson, and Ruth S. Janos. 1995. Identifying pecan cultivars by isozymes and inheritance of leucine aminopeptidase. J. Amer. Soc. Hort. Sci. 120:661-666.

Thompson, Tommy E. and L. J. Grauke. 1994. Genetic resistance to scab disease in pecan. HortScience 29:1078-1080.

Grauke, L. J. and J. W. Pratt. 1992. Pecan bud growth and freeze damage are influenced by rootstock. J. Amer. Soc. Hort Sci. 117:404-406.

Grauke, L. J., Bruce Wood and Jerry Payne. 1991. Genetic resources of Carya in Vietnam and China. Annual Report Northern Nut Growers Assoc. 82:80-87.

Ring, D. R., L. J. Grauke, J. A. Payne and J. W. Snow. 1991. Tree species used as hosts by pecan weevil (Coleoptera: Curculionidae). J. Econ. Entomol. 84:1782-1789.