Evaluating the Effectiveness of Control/Management Alternatives

This type of evaluation allows you to determine if the abundance or area of target NIS will be reduced by your different management alternatives. In order to determine if your NIS management is having the desired effect, and if this, in turn, is meeting your land management goals, you must record NIS abundance before management, and then re-visit NIS management sites again after management has been applied. Initially, management alternatives should be tested on a small scale (i.e., a small section of the management area) to avoid spending unnecessary time and money applying ineffective management to your entire management area. 
As with invasiveness, management effectiveness may vary for different levels of PO. For this reason, we recommend that you stratify your evaluation of control measures in a similar way to how you stratify a monitoring plan for monitoring invasiveness. The process is the same as monitoring for invasiveness, except that management will be applied after the initial monitoring session (i.e., between years one and two)
There are three main ways in which management effectiveness can be evaluated. The methods described below must be completed before and after management (using the same method) to evaluate if management is effective! 

  1. Record the perimeter of NIS populations with a GPS.
  2. Record stem density or % cover of the NIS in plots within populations.
  3. Photo Monitoring *This procedures above should be completed at a time when the NIS is easily identified and seasonal growth has reached its maximum. 

The procedures above should be completed at a time when the NIS is easily identified and seasonal growth has reached its maximum.
Comparing ‘before management’ and ‘after management’ documentation of abundance allows you to evaluate if a management alternative has been effective. If a particular management alternative has not reduced the abundance of the target NIS, you should try a different approach. Also, be aware of the potential off target impacts that management may have.
Learn more about Off Target Impacts

Go on to Prioritization