IPMP3.0, Oregon State University, Copyright 2000



Economic Injury Levels

[Return to Interpreting Nematode Reports]

[Return to Nematode Management]

[Return to Nematode Sampling]

[Table of Contents]


Ultimately, you will want to relate the number of a particular nematode collected at a particular time of the season to the potential damage it will cause to mint. This requires that you have some information on damage threshold information for that nematode. Unfortunately, there is not a lot of quantitative information on damage threshold densities for many nematode species. The best information for mint is discussed in this manual (see section on Economic Injury Levels). When threshold information is not available, one must rely on the experiences of growers, crop consultants, extension agents, etc. in the area. Remember that, even if you find threshold information, these are only guidelines, and judgment based on expertise is still necessary. Site specific factors can make a given population density more or less damaging. A healthy stand can withstand more nematode pressure than plants stressed by other factors such as water, nutrients, other pests, etc. Soil type may also influence damage done by given populations. In general, more damage occurs on sandy soils, but not always.