pheromone trap
Coming soon...

Welcome to our ELUTION RATE TEST RESULTS webpage.

The objectives of this webpage are to increase the utility and availability of semiochemical release rate data from commercial and research products. More specifically we hope to:

  1. Facilitate timely sharing of information on elution dynamics of semiochemical devices commonly used in forestry applications;
  2. Provide a forum for sharing of similar data collected by others (a clearinghouse of semiochemical release data);
  3. Increase the utility of elution data by promoting standardization of measurement protocols and gathering climatic data during device use and evaluation.

Many release devices have been evaluated and we continue to seek input on additional devices for testing.

Elutionrate chemicals

Elution Rate Test Results

Given the importance of semiochemical elution rates to our detection and response efforts, this web site is designed as an information sharing tool.


Releasers for semiochemicals have remained relatively rudimentary primarily due to cost and fragility.  Passive releasers elute semiochemicals through a membrane or wick and are significantly affected by meteorological conditions, making the amount of semiochemical dispensed unpredictable.  This, in turn, causes inconsistencies and inefficiencies in field applications, confounding already complex interactions between semiochemical applications and insect behavior.
Measurement of elution rates is not typically performed in the field, and a lack of standardization among studies makes comparisons and inferences difficult.  Certain designs and chemicals are better than others and may be adequate for the purposes intended; however, others are not.  Regardless, more information is generally desirable to determine the fit of semiochemical releasers to the goals of a management program. 

Project Goals:

  • To develop more consistent semiochemical releasers
  • To improve the utility of elution data through increased standardization of field-based evaluations
  • To increase the integration and availability of elution data

Improving Semiochemical Releasers:

verbenone and ethanol line graph depicting generated data
larger image larger image
Med-e-Cell has developed prototypes of a general purpose releaser for use with semiochemicals, e.g., verbenone (yellow cap) and ethanol (blue cap). Releasers actively push fluid to the outside, potentially offering more control over elution rates. Line graphs depict data generated from one sampler of each type shown. Other active releasers (e.g., "buffer" types) are also being evaluated.

Improving Elution Data:

collecting meteorological data Standardizing protocols and collecting meteorological data, in conjunction with elution data, is seen as being integral to explaining release rates and improving their predictability. Potential standards will be discussed during 2007 to gather input from users.
larger image  

If you have conducted testing and would like the results posted, please contact Brian Strom at brianstrom@fs.fed.us.

Please contact any of the following with comments, suggestions, or to post your data. Thank you!

Brian Strom (brianstrom@fs.fed.us), Sheri Smith (ssmith@fs.fed.us), Harold Thistle (hthistle@fs.fed.us), Andy Trent (atrent@fs.fed.us), Judy Adams (jadams04@fs.fed.us).

This page is made possible through efforts and funding provided by the USDA Forest Service, primarily through four cooperating groups: Southern Research Station (B. Strom, RWU-4552, Pineville, LA); Missoula Technology & Development Center (R. Karsky & A. Trent, MTDC, Missoula, MT); Forest Health Protection, Region 5 (S. Smith, Susanville, CA) and the Forest Health Technology Enterprise Team (J. Adams, FHTET, Ft. Collins, CO & H. Thistle, Morgantown, WV).