Treatment of tree stump with urea solution
The photograph is courtesy of Inverness, Ross and Skye Forest District and staff at their Fort Augustus office.
The original method of applying urea solution to a freshly cut tree stump to prevent colonisation of the stump with the fungal spores of Fomes annosus (old name – now called Heterobasidion annosus?) which would spread to the roots and infect neighbouring trees or the next planted crop.
Usually agricultural grade urea was mixed with water and a blue dye added as a marker to provide visual evidence of application. Manual fellers carried the bottle with them from tree to tree spraying the stump from the holes in the cap and brushing to provide a full cover.
Picture added on 15 March 2016 at 08:53