Fungicides and Nematicides

Seed Treatment as a Component of Integrated Disease Management

chickpea root rot

legume root rot

Root disease complex on chickpea

On left, untreated seed suffered severely reduced spring wheat emergence

Pythium damping-off of seedlings in cold soil: untreated seed on the left and seed treated with metalaxyl on the right

legume yellowing

Root disease complex affecting productivity of chickpea

Loose Smut

Seed treatment can prevent loose smut in wheat

 Pythium attacks root cortex

Known for causing damping-off of seedlings, Pythium also attacks the cortex of mature roots

Seed Treatments for Improving Production Efficiency for Field Crops

Fungicide seed treatments are an important component of integrated disease management programs for small grain cereals and food legumes in the Pacific Northwest . Seed treatments are particularly important for controlling pathogens causing smuts of cereals and seedling damping-off of all field crops. Nematicides are of on-going interest for minimizing yield losses caused by plant-parasitic nematodes. Field tests are performed to determine economic efficiencies for new fungicide chemistries and formulations. The most comprehensive and recent resource that explains options available for treating seed of small grain cereals with fungicides is an Extension Bulletin released by Montana State University. That bulletin is applicable to protection of wheat and barley throughout the Pacific Northwest. It is highly recommended and is freely available at the link at the top of the following list. Representative papers from our research at OSU follows the link to the MSU bulletin.

  • Dyer, A., J. Johnson, C. Tharp, and M. Burrows. 2012. Small Grain Seed Treatment Guide. Montana State University Extension MontGuide #MT199608AG. (bulletin)
  • Smiley, R.W., J.A. Gourlie, K.E.L. Rhinhart, J.M. Marshall, M.D. Anderson, and G.P. Yan. 2012. Influence of nematicides and fungicides on spring wheat in fields infested with soilborne pathogens. Plant Disease 96:1537-1547. (abstract)
  • Smiley, R.W., and L-M. Patterson. 1995. Winter wheat yield and profitability from Dividend and Vitavax seed treatment. Journal of Production Agriculture 8:350-354. (abstract)
  • Smiley, R.W., L-M. Patterson, and K.E.L. Rhinhart. 1996. Fungicide seed treatment effects on emergence of deeply planted winter wheat. Journal of Production Agriculture 9:564-570. (abstract)
  • Smiley, R.W., L-M. Patterson, and C.W. Shelton. 1996. Fungicide seed treatments influence emergence of winter wheat in cold soil. Journal of Production Agriculture 9:559-563. (abstract)
  • Montfort, F., B.L. Klepper, and R.W. Smiley. 1996. Effects of two triazole seed-treatments, triticonazole and triadimenol, on growth and development of wheat. Pesticide Science 46:315-322. (abstract)
  • Smiley, R., J. Gourlie, R. Whittaker, S. Easley, K. Rhinhart, E. Jacobsen, A. Burnett, J. Jackson, D. Kellogg, and T. Zeckman. 2004. Seed treatments for chickpea (garbanzo bean). Oregon Agricultural Experiment Station Special Report 1054:120-127. (abstract)
  • Smiley, R., S. Easley, J. Gourlie, R. Whittaker, K. Rhinhart, E. Jacobsen, T. Zeckman, and J. Jackson. 2004. Seed treatments for controlling damage by root diseases on winter wheat in Oregon, 2002-2003. Fungicide and Nematicide Tests 59:ST008. (on-line journal of the American Phytopathological Society)
  • Smiley, R., J. Gourlie, S. Easley, R. Whittaker, K. Rhinhart, E. Jacobsen, T. Zeckman, and J. Jackson. 2004. Seed treatments for controlling root disease complexes on chickpea, 2003. Fungicide and Nematicide Tests 59:ST009. (on-line journal of the American Phytopathological Society)
  • Corp, M., S. Machado, D. Ball, R. Smiley, S. Petrie, M. Siemens, and S. Guy. 2004. Chickpea Production Guide. OSU Ext. Publ. EM 8791-E. 14 p. (bulletin)
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