Dennis Calvin

  • Director, Penn State Extension
  • Associate Dean, College of Agricultural Sciences
Dennis Calvin
323C Ag Administration Building
University Park, PA 16802
Work Phone: 814-865-4028


  1. B.S., Iowa State University, 1978
  2. M.S., Kansas State University, 1981
  3. Ph.D., Kansas State University, 1985


As the director of Penn State Extension, Dennis Calvin is responsible for leading a dynamic team of administrators, educators, researchers, and sales, support, and service staff across Pennsylvania's 67 counties. He identifies opportunities and approaches for implementing strategic priorities as identified by college leadership, experts from Penn State and the academic community, and state and federal regulators.

Calvin is responsible for positioning the organization as a world leader in the practical application of cutting-edge research to Pennsylvania's food and fiber system, our economy, and the people we serve. Under his leadership, Penn State Extension has undertaken a major restructuring effort to align programs and products with stakeholder needs, deliver programming in ways that best meet customer preferences, and maximize statewide operational efficiency. This includes the reorganization of personnel and significant expansion of Penn State Extension's digital education capabilities.

Calvin has a strong background in extension and research with Penn State. He joined the faculty as an assistant professor of entomology in 1985. His academic research explores population dynamics, insect-plant interactions, and sampling technology related to insect pest management; modeling of biological systems; and the effects of climatic uncertainty on insect population dynamics and management.

From 1985 to 1996. Calvin also served as the university's integrated pest management coordinator. His extension work concerns pest management of field and forage crops and stored products, development of expert systems and decision support systems, and economic and social aspects of integrated pest management.

From 2009 to 2011, Calvin served as interim director of Penn State Extension before assuming the appointment full-time.

He holds a bachelor’s degree in agronomy and pest management from Iowa State University and master’s and doctoral degrees in entomology from Kansas State University.

Relevant Publications

Calvin, D. D., J. E. Losey, M. C. Knapp, and F. L. Poston. 1997. Oviposition and development of Trichogramma pretiosum (Hymenoptera: Trichogrammatidae) in three age classes of southwestern corn borer eggs. Environ. Entomol. 26(2):385-390.

Calvin, D.D. 1995. Economic Benefits of Transgenic Corn Hybrids for European Corn Borer Management in the United States. A Report to the Monsanto Company. pp. 69. (link to complete report - Part 1, Part 2, Part 3, Part 4, Part 5, Part 6, Part 7)

Losey, J. E., S. J. Fleischer, D. D. Calvin, W. L. Harkness and T. Leahy. 1995. Evaluation of Trichogramma nubilale and Bacillus thuringiensis in management of Ostrinia nubilalis (Lepidoptera: Pyralidae) in sweet corn. Environ. Entomol. 24(2):436-445.

Calvin, D. D. and P. Z. Song. 1994. Variability in postdiapause development periods of geographically separate Ostrinia nubilalis (Lepidoptera: Pyralidae) populations in Pennsylvania. Environ. Entomol. 23(2):431-436.

Calvin, D. D., R. A. Higgins, M. C. Knapp, F. L. Poston, S. M. Welch, W. B. Showers, J. F. Witkowski, C. E. Mason, H. C. Chiang, and A. J. Keaster. 1991. Similarities in developmental rates of geographically separate European corn borer (Lepidoptera: Pyralidae) populations. Environ. Entomol. 20(2):441-449.

Mason, C. E., M. E. Rice, D. D. Calvin, J. W. Van Duyn, W. B. Showers, W. D. Hutchison, J. F. Witkowski, R. A. Higgins, D. W. Onstad, and G. P. Dively. 1996. European corn borer ecology and management. North Central Regional Extension Publication No. 327. Ames, Iowa.

Spangler, S. M. and D. D. Calvin. 2000. Influence of sweet corn growth stages on European corn borer (Lepidoptera: Crambidae) Oviposition. Environ. Entomol. 29(6): 1226 1235.

Losey, J. E., D. D. Calvin, M. E. Carter, and C. E. Mason. 2001. Evaluation of noncorn host plants as a refuge in a resistance management program for European corn borer (Lepidoptera: crambidae) on Bt-corn. Environ. Entomol.: 30: 728-735.

Ortman, E. E., B. D. Barry, L. L. Bushman, D. D. Calvin, J. Carpenter, G. P. Dively, J. E. Foster, Hellmich, R. L., R. A. Higgins, T. E. Hunt, G. P. Munnkvold, K. R. Ostlie, R. T. Roush, M. K. Sears, A. M. Shelton, B. D. Siegfried, P. E. Sloderbeck, K. L. Steffey, F. T. Turpin, and J. L. Wedberg. 2001. Transgenic insecticide corn: The agronomic and ecological rationale for its use. Bioscience 51(11): 900-902.

Spangler, S. M. and Calvin D. D. 2001. Vertical distribution of European corn borer egg masses on sweet corn. Environ. Entomol. 30(2): 274 279.

Clinton D. Pilcher, Marlin E. Rice, Randall A. Higgins, Kevin L. Steffey, Richard L. Hellmich, John Witkowski, Dennis Calvin, Kenneth R. Ostlie, and Michael Gray. 2002. Biotechnology and the European corn borer: Measuring historical farmer perceptions and the adoption of transgenic Bt corn as a pest management strategy. J. of Econ. Entomol. 95(5): 878-892.

Nowatzki, T. M., J. J. Tollefson, and D. D. Calvin, 2002. Development and validation of models for predicting the seasonal emergence of corn rootworm (Coleoptera: Chrysomelidae) beetles in Iowa. Environ. Entomol.: 31(5): 864-873.

Spangler, S. M., D. D. Calvin, and M. A. Nemeth. 2003. Infestation of European corn borer (Lepidoptera: Crambidae) in sweet corn as predicted by time of oviposition. J. Econ. Entomol. 96(2); 413 - 419.

Sked, S. L. and D. D. Calvin. 2004. Phenological synchrony between Macrocentrus cingulum Brischke (Hymenoptera: Braconidae) with its preferred host, Ostrinia nubilalis Hubner (Lepidoptera: Crambidae), using models. Environ. Entomol. (Accepted for Publication, October 2003).

Xingquan, K., D. D. Calvin, M. C. Knapp, and F. L. Poston. 2004. Female European corn borer (Lepidoptera: Crambidae) ovarian development stages: Their association with oviposition and use in a classification system. J. of Econ. Entomol. (Accepted for Publication, October 2003).

Dillehay, B., G. W. Roth. D. D. Calvin, R. J. Kratochvil, G. A. Kuldau, and J. A. Hyde. 2004 Performance of Bt-corn Hybrids, their near-isolines and Leading corn hybrids in Pennsylvania and Maryland. Agron. J. 96: 818-824.

Myers, M. W., W. S. Curran, M. J. VanGessel, B. A. Majeck, B. A. Scott, D. A. Mortensen, D. D. Calvin, H. D. Karsten, and G. W. Roth. 2004. Predicting emergence of eight annual weed species in the northeastern United States. Accepted for publication in Weed Techn.

Myers, M. W., W. S. Curran, M. J. VanGessel, B. A. Majeck, B. A. Scott, D. A. Mortensen, D. D. Calvin, H. D. Karsten, and G. W. Roth. The Effect of Weed Density and Application Timing on Weed Control and Corn (Zea mays) Grain Yield. Accepted for publication in Weed Techn.

Myers, M. W., W. S. Curran, M. J. VanGessel, B. A. Majek, D. D. Calvin, D. A. Mortensen, H. D. Karsten, and G. W. Roth. Effect of Spring Tillage on Annual Weed Species Emergence in the Northeastern United States. Accepted for publication in Weed Techn.

Dively, G. P., R. Rose, M. K. Sears, R. L. Hellmich, D. E. Stanley-Horn, D. D. Calvin, And J. M Russo. Effects on monarch butterfly larvae after continuous exposure to Cry 1Ab-expressing corn pollen during anthesis. Environ. Entomol. 33(4): 1116 - 1125.

Dillehay, B. L. , D. D. Calvin, G. W. Roth, J. A. Hyde, G. A. Kuldau, R. J. Kratochvil, J. M. Russo, and D. G. Voight. Verification of a European corn borer (Lepidoptera: Crambidae) loss equation in the major corn production region of the northeastern United States. Accepted for publication in J. of Econ. Entomol.