2016. ‘Unusual’ transmission of blister rust disease through root grafting: Western white pine (Pinus monticola) with white pine blister rust canker at the base of the tree. Dorena Genetic Resource Center, Cottage Grove, Oregon.

‘Unusual’ transmission of blister rust disease through root grafting: Western white pine (Pinus monticola) with white pine blister rust canker at the base of the tree ~11 years after inoculation with Cronartium ribicola, as a two-year old seedling (sow year 2004). Dorena Genetic Resource Center, Cottage Grove, Oregon.

 

More from Richard Sniezko:

Normally the rust infects through needles and then proceeds to the stem, but some survivors of rust testing at Dorena GRC have shown first cankers >10 years after inoculation, and at the base of the tree. Contact richard.sniezko@usda.gov for more information.

 

Photo by: Richard Sniezko

Date: August 2, 2016

 

Credit: USDA Forest Service, Region 6, Umpqua National Forest, Dorena Genetic Resource Center.

Source: Richard Sniezko collection; Cottage Grove, Oregon.

 

For more about the Dorena Genetic Resource Center see: www.fs.usda.gov/detail/r6/landmanagement/resourcemanageme...

 

Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth

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