##  [Minimizing Losses to Armillaria Root Rot in Ontario Spruce](/resource/minimizing-losses-armillaria-root-rot-ontario-spruce) 

Organization

[Natural Resources Canada (NRCan)](/organization/natural-resources-canada-nrcan)

[2 Billion Trees (2BT)](/organization/2-billion-trees-2bt)

 

 

Project

[Great Lakes Forestry Centre](/project/great-lakes-forestry-centre)

 

Resource Type

[Technical guide](/taxonomy/term/35)

 

 

Author(s)

Michael Dumas

Roy Whitney

 

 

Original Authors

Michael Dumas

Roy Whitney

 

 

Resource Date:

1994

 

Page Length

4

 

 

Armillaria root rot is the most widespread and destructive root disease of trees in Ontario. The main species found within the province is *Armillaria ostoyae* \[Romagnesi| Kerink (Dumas 1988) which attacks commercial hardwoods and conifers of any age. The Armillaria-infecting propagules are found wherever woody material is present in the soil.