Heterobasidion Root Disease Interactive Guide
Result
HRD is not present in the stand AND the stand IS within 25 miles of a confirmed HRD stand.
Learn more in Chapter 3 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.
Exceptions/Modifications
Chapter 3, Exception 1, may be utilized and you may choose not to apply the preventative stump treatment. Exception 1 states: treatment is not required because it is the final harvest and the future desired stand will be less than 50% pine or spruce.
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 if HRD were to develop in the stand. It is important to note that there are no treatments to eradicate the pathogen after it infests a stand.