Heterobasidion Root Disease Interactive Guide
Result
HRD is present in the stand.
Learn more in Chapter 4 of the HRD guidelines.
Recommendation
If harvesting occurs from April 1–November 30, preventive stump treatment on pine and spruce is recommended if more than 50% of the stand is pine and/or spruce. The minimum tree size for treatment is merchantable size. No treatment is required from December 1–March 31. Harvesting without preventive stump treatment can be considered April 1–November 30 under certain conditions listed as Exceptions or Modifications (see below).
Exceptions/Modifications
Chapter 4 (HRD is present in your stand), Exception 2, may be utilized and you may choose not to apply the preventative stump treatment. Exception 2 states: Treatment is not be required because it is the final harvest, and, pine and spruce are not an important part of the future desired stand.
Exceptions are considered relatively common and are straightforward to apply. No detailed justification is needed to apply the Exceptions. However, a short explanation of which Exception was used should be included in the timber sale documentation.
Things to consider
If you choose to harvest during April 1–November 30 without stump treatment, consider the potential impact to the stand and subsequently to adjacent stands. It is important to note that there are no treatments to eradicate the pathogen after it infests a stand.