Mark J. VanGessel


  • Ph.D., Weed Science, Crop Science Department, North Carolina State University. Spring 1992.
  • M.Sc., Weed Science, Crop and Soil Sciences Department, Michigan State University. Spring 1989.
  • B.A., Political Science, Hope College, Holland, MI. Spring 1982.


  • My extension program focuses on developing and disseminating weed control recommendations and other technical information appropriate to agronomic and commercial vegetable crops.  Technical information emphasizes weed biology and ecology.  Extension responsibilities include weed management for agronomic crops in New Jersey.


  • Research efforts fall into five main areas: weed biology and ecology, integrated pest management, perennial weed management, herbicide-resistant weeds, and herbicide evaluation.  Research has focused on agronomic and commercial vegetable crops important to the mid-Atlantic region.

Professional Activities

  • Weed Science Society of America
  • International Weed Science Society
  • Northeastern Weed Science Society
  • Agronomy Society of America
  • Council of Agricultural Science and Technology
  • Delaware Invasive Species Council

Recent Publications

Extension Publications:
(available at: UD Research and Education Center Publications)

Palmer amaranth control in crop land

Management of glyphosate-resistant horseweed (also called marestail) in no-tillage soybeans.

Sweet corn hybrid tolerance to Callisto and Accent.

Pasture and Hay Weed Management Guide.  DE Weed Facts No. 13.

Soybean weed management guide: for Delaware and New Jersey.  DE Weed Facts No. 11.

Corn weed management guide: for Delaware and New Jersey.  DE Weed Facts No. 10.

Research Publications:

49. Hill, E.C., K.A. Renner, M.J. VanGessel, R.R. Bellinder, and B.A. Scott. 2015. Late-season weed management to stop viable weed seed production. Weed Science, In press.

48. Meyer, S.L.F., I.A. Zasada, S.M. Ruppercht, M.J. VanGessel, C.R.R. Hooks, M.J. Morra, and K.L. Everts. 2015. Mustard seed meal for management of root-knot nematode and weeds in tomato production. HortTechnology, 25:192-202.

47. Brainard, D., W.C. Curran, R.R. Bellinder, M. Ngouajio, M.J. VanGessel, M.J. Haar, W.T. Lanini, and J.B. Masiunas. 2012. Temperature and relative humidity affect weed response to vinegar and clove oil based herbicides. Weed Technology 27:156-164.

46. Rousonelos, S.L, R.M. Lee, M.S. Moreira, M.J. VanGessel, and P.J. Tranel. 2012. Characterization of a common ragweed (Ambrosia artemisiifolia) population resistant to ALS- and PPO-inhibiting herbicides. Weed Science 60:335-344.

45. Scott, B.A., M.J. VanGessel, and S.E. White. 2009. Herbicide-resistant weeds in the United States and their impact on extension. Weed Technology 23:599-603.

44. VanGessel, M.J., Q.R. Johnson, and B.A. Scott. 2009. Evaluating postemergence herbicides for relative corn safety. Crop Management doi:10.1094/CM-2009-0806-01-RS.

43. VanGessel, M.J., B.A. Scott, Q.R. Johnson, and S.E. White-Hansen. 2009. Influence of glyphosate-resistant horseweed (Conyza canadensis) growth stage on response to glyphosate applications. Weed Technology 23:49-53.

42. Dauer, J.J. D.A Mortensen; E.C. Luschei; S.A Isard; E.Shields; M.J. VanGessel. 2008. Conyza canadensis seed ascent in the lower atmosphere. Agricultural and Forest Meteorology.

41. Scott, B.A. and M.J. VanGessel. 2007. Delaware soybean grower survey on glyphosate-resistant horseweed (Conyza canadensis). Weed Technology 21:270-274.

40. Zelaya, I.A., M.D.K. Owen, and M.J. VanGessel. 2007. Transfer of glyphosate resistance: evidence for hybridization in Conyza (Asteraceae). American Journal of Botany 94:660-673.

39. Dauer, J.T., D.A. Mortensen, and M.J. VanGessel 2007. Temporal and spatial dynamics of long-distance Conyza canadensis seed dispersal. Journal of Applied Ecology 44:105-114.

38. VanGessel, M.J., B.A. Scott, and Q.R. Johnson. 2006. Paraquat-resistant horseweed identified in the Mid-Atlantic States. Crop Management (Plant Management Network) doi:10.1094/CM-2006-0420-01-RS.

37. Shields, E.J., J.T. Dauer, M.J. VanGessel, and G. Neumann. 2006. Horseweed Conyza canadensis seed collected in the planetary boundary layer. Weed Science 54:1063-1067.

36. Myers, M.W, W.S. Curran, M.J. VanGessel, B.A. Majek, D.D. Calvin, D.A. Mortensen, H.D. Kirsten, and G.W. Roth. 2005. Effect of spring disturbance on annual weed emergence in the northeastern United States. Weed Technology 19:274-282.

35. Myers, M.W, W.S. Curran, M.J. VanGessel, B.A. Majek, B.A. Scott, D.A. Mortensen, D.D. Calvin, H.D. Karsten, and G.W. Roth. 2005. The effect of weed density and application timing on weed control and corn (Zea mays) grain yield. Weed Technology 19:102-107.

34. Johnson, J.M., J.A. Hough-Goldstein, and M.J. VanGessel. 2004. Effects of straw mulch on pest insects, predators, and weeds in watermelons and potatoes. Environmental Entomology 33:1632-1643.

33. VanGessel, M.J. and Q.R. Johnson. 2005. Evaluating drift control agents to reduce short distance movement and impact on herbicide performance. Weed Technology 19:78-85.

32. Zelaya, I.A., M.D.K. Owen, and M.J. VanGessel. 2004. Inheritance of evolved glyphosate resistance in Conyza canadensis (L.) Cronq. Theoretical Applied Genetics 110:58-70.

31. Sankula, S., M.J. VanGessel, and R. Mulford. 2004. Corn leaf architecture as a tool for weed management in two corn production systems. Weed Science 52:1026-1033.

30. Myers, M.W., W.S. Curran, M.J. VanGessel, D.D. Calvin, D.A. Mortensen, B.A. Majek, H.D. Karsten, and G.W. Roth. 2004. Predicting weed emergence for eight annual species in the Northeastern United States. Weed Science 52:913-919.

29. VanGessel, M. J., D. Raymond Forney, M. Conner, S. Sankula, and B. A. Scott. 2004. A sustainable agriculture project at Chesapeake Farms: a six-year summary of weed management aspects, yield and economic returns. Weed Science 52:886-896.

28. Hough-Goldstein, J.A., M.J. VanGessel, and A.P. Wilson. 2004. Manipulation of weed communities to enhance ground-dwelling arthropod populations in herbicide-resistant field corn. Environmental Entomology 33:577-586.

27. Wilson, A., J. Hough-Goldstein, M. VanGessel, and J. Pesek. 2004. Effects of varying weed communities in corn on European corn borer, Ostrinia nubilalis (Hubner) (Lepidoptera: Crambidae) oviposition and egg mass predation. Environmental Entomology 33:320-327.


Contact Information
Mark J. VanGessel

Professor and Extension Specialist

Plant and Soil Sciences
Research and Education Center
16684 County Seat Highway
Georgetown, DE 19947
Phone: (302) 856-7303