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Nematode Thresholds and Damage Levels for California Crops

Explore nematode thresholds and damage levels for California crops with data sources from Howard Ferris and Philip Roberts, detailing constraints and field studies. Discover case studies, damage functions, and references for effective nematode management.

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Nematode Thresholds and Damage Levels for California Crops

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  1. Nematode Thresholdsand Damage LevelsforCalifornia Crops 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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