Interpretation of Nematode Count Data in Long-term Plantings Howard Ferris Department of Nematology University of California Davis December 2009.

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Presentation transcript:

Interpretation of Nematode Count Data in Long-term Plantings Howard Ferris Department of Nematology University of California Davis December 2009

Tolerance Level Example: management costing $300 Economic Threshold (for this management option)

Area = average nematodes * Degree-Days Dosage = average nematodes But what about perennial crops of different age, susceptibility, supporting different nematode communities? Determining trajectories of change……

500 DD Threshold temperature

Moving average calculations Determining trajectories of change……

Some Real Data…..

Area = average nematodes * Degree-Days Cumulative Nematode Dosage = Σ Areas

Happy Nematode Hunting!