3190 Maile Way #102
Honolulu, HI 96822

Phone: (808) 956-5698

Fax: (808) 956-3894

Email: defrenk@hawaii.edu

Joseph DeFrank

Researcher in Weed Science 


Weed Management in Vegetables, Ornamental Plants, Turf and Ground Covers
Pesticide Application License (Cat. 10)


Penns Cove Regional High School
B.S., Rutgers, 1977
M.S., Michigan State University, 1979
Ph.D., Michigan State University, 1983

Research Interests:

No-tillage farming; Weed control in vegetable and ornamental crops, and turfs; Ground covers in orchards; Establishment of native Hawaiian plants on roadways

<p> <a href="https://www.ctahr.hawaii.edu/defrankJ/index.htm"> https://www.ctahr.hawaii.edu/defrankJ/index.htm</a></p>

Selected Publications:

  • Brosnan, J.T., J. DeFrank, M. Woods and G. Breeden. 2009. Sodium Chloride Salt Applications Provide Effective Control of Sourgrass (Paspalum conjugatum Berg.) in Seashore Paspalum (Paspalum vaginatum Swartz.) Turf. Weed Technology: 23:251-256.
  • Brosnan, J.T., J. DeFrank, M.S. Woods and G.K. Breeden. 2009. Efficacy of Sodium Chloride Salt Applications for Control of Goosegrass (Eleusine indica L.) in Seashore Paspalum (Paspalum vaginatum Swartz) Turf. Weed Technology 23:179-183.
  • Brosnan, J.T., R.K. Nishimoto and J. DeFrank. 2008. Metribuzin-Resistat goosegrass (Elusine indica L.) in Bermudagrass (Cynodon spp. L.) turf. Weed Technology (22) No. 4:675-678.
  • Baldos, O.C., J. DeFrank and G. Sakamoto, 2009. Effect of pre and post emergence herbicide application timing on hydroseeded Fimbristylis cymosa. 2009 Hawaii Conservation Conference, Hawaii in a changing climate: ecological, cultural, economic and policy challenges and solutions, July 28-30, 2009. Hawaii Convention Center, Honolulu HI.
  • Baldos, O.C. and J. DeFrank. 2009. Screening of pre-emergence herbicides to improve roadside establishment of transplanted Sporobolus virginicus (L.) Kunth, a native Hawaiian grass. Abstract #91, pg 10. 21st Annual CTAHR Student Research Symposium, April 3-4, 2009. University of Hawaii at Manoa, Honolulu.
  • Moata, M.R.S. and J. DeFrank. 2009. Utilization of piligrass (Heteropogon contortus) as a living mulch for cabbage (Brassica oleracea L. var. Capitata) production. Abstract #44, pg 5. 21st Annual CTAHR Student Research Symposium, April 3-4, 2009. University of Hawaii at Manoa, Honolulu.
  • 9. Scully, B. T., Nagata R. T., Sistrunk, D. M., Cherry, R. H., Nuessly, G. S., Kenworthy, K. E., and DeFrank , J. 2011, Registration of ‘Aloha’ Seashore Paspalum. Journal of Plant Registration 5(1): 1-5.
  • Baldos, O.C., J. DeFrank, Lukas S.B. 2017. Evaluation of three hydromulch planting techniques for establishing Fimbristylis cymosa (mau‘u ‘aki‘aki), a native Hawaiian coastal sedge with roadside revegetation and landscape ground cover potential. Native Plants Journal 18(1):20–31.
  • Lukas, Scott B., J. DeFrank, O.C. Baldos. 2016. Determination of Optimal Seed Harvest Timing for Panicum torridum Based on Growing Degree Day Heat Unit Accumulation. Seed Technology Journal 37(2): 151- 159, 2016
  • Lukas, Scott B., J. DeFrank, O.C. Baldos. 2016. Optimization of Walteria indica seed dormancy relief treatments and seed storage parameters. HortScience 51(9):1184-1187.