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Nematode Thresholds and Damage Levels for California Crops. Howard Ferris. Some of those involved…. Dan Ball Larry Duncan Pete Goodell Joe Noling Diane Alston Sally Schneider Lance Beem. Thresholds by field plot. South Coast Field Station USDA Shafter Tulelake.

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Nematode thresholds and damage levels for california crops

Nematode Thresholdsand Damage LevelsforCalifornia Crops

Howard Ferris


Some of those involved
Some of those involved….

  • Dan Ball

  • Larry Duncan

  • Pete Goodell

  • Joe Noling

  • Diane Alston

  • Sally Schneider

  • Lance Beem


Nematode thresholds and damage levels for california crops

Thresholds by field plot

  • South Coast Field Station

    • USDA Shafter

    • Tulelake


Nematode thresholds and damage levels for california crops


Seinhorst damage function
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



Nematode thresholds and damage levels for california crops

Case Study on Cotton

Meloidogyne incognita, J2/250 cc soil



Thresholds and expected yield loss
Thresholds and Expected Yield Loss

Meloidogyne incognita, J2/250 cc soil; adjusted for extraction efficiency


Expected damage
Expected Damage

Meloidogyne chitwoodi; summer crop potato; Klamath Basin

Fall population levels; adjusted for extraction efficiency


Thresholds and expected yield loss1
Thresholds and Expected Yield Loss

Heterodera schachtii, eggs/100g soil

Sugarbeets

Expected % yield loss at different preplant nematode densities

Data from P.A. Roberts



Nematode thresholds and damage levels for california crops

Annual Population Change (Host Crop)

120000

100000

80000

60000

Pi1 * (Pi2/Pi1)

40000

20000

0

0

500

1000

1500

2000

Pi1


Nematode thresholds and damage levels for california crops

Pi1

Annual Population Change (Non-host)

Pi2

1400

Pi3

1200

1000

800

Pi(t+x)

600

400

200

0

0

500

1000

1500

2000

Pi(t)


Nematode thresholds and damage levels for california crops

1600

1400

1200

1000

800

Pi(t+x)

600

400

200

0

0

1

2

3

4

5

6

7

8

Years After Planting Host Crop



Nematode thresholds and damage levels for california crops

Year 1

Year 2

100

12000

10000

80

8000

60

LU

LU

AUC

AUC

6000

40

LT

LT

4000

20

NU

NU

2000

0

NT

NT

0

0

1000

2000

3000

0

1000

2000

3000

DD

DD

Year 3

30000

25000

20000

LU

AUC

15000

LT

10000

NU

5000

0

NT

0

1000

2000

3000

DD


Some references
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.


Nematode thresholds and damage levels for california crops

References

Burt, O. R. and H. Ferris. 1996. Sequential decision rules for managing nematodes with crop rotations.

J. Nematology 28:457-474.

Chen, J., J.R. Carey and H. Ferris. 2001. Comparative demography of isogenic populations of Caenorhabditis elegans Expt. Gerontology 36:431-440.

Ferris, H. 1978. Nematode economic thresholds: derivation, requirements and theoretical considerations.

J. Nematology 10:341-350.

Ferris, H. 1985. Density-dependent nematode seasonal multiplication and overwinter survivorship: a critical point model. J. Nematology 17:93-100.

Hsin, H. and C. Kenyon. 1999. Signals from the reproductive system regulate the lifespan of C. elegans. Nature 399:362-366.

Kim D.G. and H. Ferris. 2001. Relationship between crop losses and initial population densities of Meloidogyne arenaria in winter-grown oriental melon in Korea. J. Nematology (subm.)

Noling, J.W. and H. Ferris. 1987. Nematode-degree days, a density-time model for relating epidemiology and crop losses in perennials. J. Nematology 19:108-118.

Seinhorst, J.W. 1965. The relationship between nematode density and damage to plants.

Nematologica 11:137-154.

Seinhorst, J.W. 1967. The relationship between population increase and population density in plant parasitic nematodes. II. Sedentary nematodes. Nematologica 13:157-171.

Somers, J.A., H.H. Shorey and L.K. Gaston. 1977. Reproductive biology and behavior of Rhabditis pellio (Schneider) (Rhabditida:Rhabditidae). J. Nematology 9:143-148.

More information:

http://plpnemweb.ucdavis.edu/nemaplex