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Nematode Thresholds: Yield Damage Functions & Management

Explore nematode thresholds, damage levels, and management strategies for sustainable crop production. Case studies, field plots, and economic perspectives are discussed.

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Nematode Thresholds: Yield Damage Functions & Management

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  1. Nematode Thresholdsand Damage Levels Howard Ferris and Philip Roberts Nematology Workgroup Meeting March, 2005

  2. Sources of Data • Ferris et al, 1970s and 1980s • Roberts et al, 1980s • Cooke and Thomason, 1970s Some Constraints to Early Adoption • Availability of inexpensive nematicides • Development of resistant varieties in some crops • Publication of thresholds in arcane format

  3. Some of those involved…. • Dan Ball • Larry Duncan • Pete Goodell • Joe Noling • Diane Alston • Sally Schneider • Lance Beem

  4. Thresholds by field plot • South Coast Field Station • USDA Shafter • Tulelake

  5. Thresholds by transect • Imperial and Coachella Valleys • Ventura County • Tulare County

  6. Seinhorst Damage Function • Y=m+(1-m)z(Pi-T) • Y=relative yield • m=minimum yield • Z=regression parameter • Pi=population level • T=tolerance level • Based on preplant population levels – measured or predicted from overwinter survival rates

  7. Case Study on Cotton

  8. Case Study on Cotton Meloidogyne incognita, J2/250 cc soil

  9. Damage Function Parameters for Selected Crops

  10. Thresholds and Expected Yield Loss Meloidogyne incognita, J2/250 cc soil; adjusted for extraction efficiency

  11. Expected Damage Meloidogyne chitwoodi; summer crop potato; Klamath Basin Fall population levels; adjusted for extraction efficiency

  12. Thresholds and Expected Yield Loss Heterodera schachtii, eggs/100g soil Sugarbeets Expected % yield loss at different preplant nematode densities

  13. Some References Benedict, J.H., K.M. El-Zik, L.R. Oliver, P.A. Roberts, and L.T. Wilson. 1989. Economic injury levels for cotton pests. Chapter 6. In: Integrated Pest Management Systems and Cotton Production. R.E. Frisbie, K.M. El-Zik, and L.T. Wilson (eds.). John Wiley and Sons, New York. Pp. 121-153. Cooke, D. A., and I. J. Thomason. 1979. The relationship between population density of Heterodera schachtii, soil temperature, and sugarbeet yields. Journal of Nematology 11:124-128. Duncan, L. W. and H. Ferris. 1983. Effects of Meloidogyne incognita on cotton and cowpeas in rotation. Proceedings of the Beltwide Cotton Production Research Conference: 22-26. Ferris, H. 1984. Probability range in damage predictions as related to sampling decisions. Journal of Nematology 16:246-251. Ferris, H. 1985. Population assessment and management strategies for plant-parasitic nematodes. Agricultural, Ecosystems and Environment 12(1984/85):285-299. Ferris, H., D. A. Ball, L. W. Beem and L. A. Gudmundson. 1986. Using nematode count data in crop management decisions. California Agriculture 40:12-14. Ferris, H., H. L. Carlson and B. B. Westerdahl. 1994. Nematode population changes under crop rotation sequences: consequences for potato production. Agronomy Journal 86:340-348. Ferris, H., P. B. Goodell and M. V. McKenry. 1981. Sampling for nematodes. California Agriculture 35:13-15. Goodell, P.B., M. A. McClure, P. A. Roberts, and S. H. Thomas 1997. Nematodes. In: Integrated Pest Management for Cotton in the Western Region of the United States. 2nd edition. Univ. of California Publ. No. 3305. Pp. 103-110. Roberts, P.A. and G.D. Griffin. 1994. The economic feasibility of management alternatives. In: Quantifying Nematode Control. G.D. Griffin and P.A. Roberts (eds.). Western Regional Research Publication #149, Utah State University Press, Logan, UT. Pp. 23-49. Roberts, P.A. and I.J. Thomason. 1981. Sugarbeet Pest Management: Nematodes. Univ. of California Special Publ. No. 3272. 32 pages.

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