Canadian Forest Service Publications
Estimation of butt rot in a white spruce plantation. 1979. Lachance, D. Canadian Journal of Forest Research 9(2): 287-289.
Issued by: Laurentian Forestry Centre
Catalog ID: 16258
Availability: PDF (request by e-mail)
Presence or absence of decay in trees in a 46-year-old white spruce (Picea glauca) plantation was predicted from ocular observations and from one increment boring in each tree at 15-20 cm from the ground. Amount of decay was estimated from increment cores and compared with measurements taken after tree felling and dissection. Ocular and boring predictions of tree condition were 63.5 and 86.8% correct respectively. This accuracy was increased to 76.1 and 98.0% respectively when 2 dm3 of decay in a tree was considered negligible. There was a linear correlation (r = 0.67) between the estimated area of decay (in square decimetres) from the increment core and the total volume of decay (cubic decimetres) in the tree. A regression equation applicable on a stand basis is given.