Reaction zone and periodic increment decrease in Picea abies trees infected by Heterobasidion annosum s.l.

2010 ◽  
Vol 260 (5) ◽  
pp. 692-698 ◽  
Author(s):  
Jonàs Oliva ◽  
Magnus Thor ◽  
Jan Stenlid
Keyword(s):  
Picea Abies ◽  
Reaction Zone ◽  
Heterobasidion Annosum

scholarly journals The Profitability of Cross-Cutting Practices in Butt-Rotten Picea abies Final-Felling Stands

Forests ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 874 ◽  
Author(s):  
Kärhä ◽  
Räsänen ◽  
Palander
Keyword(s):  
Picea Abies ◽  
Norway Spruce ◽  
Processing Time ◽  
Wood Quality ◽  
Study Data ◽  
Heterobasidion Annosum ◽  
Time And Motion ◽  
The Cross ◽  
Motion Studies ◽  
The Impact

Research Highlights: This study offers new information on the cross cutting of decayed stems with the sounding of short (0.5 m) offcuts and the bucking of longer (3.0 m) butt-rotten poles. Background and Objectives: The root and butt-rot fungus Heterobasidion annosum sensu lato (Fr.) Bref. causes wood quality damage to trees in softwood forests. When timber is harvested in butt-rotten forests, it is essential that the decayed part of the tree is recognized and cut away from a stem, while the healthy and good quality log section of a stem is cross cut with precision sawlogs. The objective of the study was to investigate the impact of two off-cutting methods on stem processing time, cutting productivity, sawlog volume, and commercial value at the roadside landing when harvesting timber from the butt-rotten Norway spruce (Picea abies (L.) Karst.) final-felling forests. Materials and Methods: The length of the short offcuts used was 0.5 m. The results of the cross-cutting practices were compared to the decayed pulpwood poles of 3 m from the butt of the rotten stems. Time and motion studies were carried out in stands before the profitability calculations. The study data consisted of 1980 Norway spruce sawlog stems. Results: Sounding of the short offcuts added significantly to the stem processing time of butt-rotten stems, but the sawlog volume and the timber value recovery of the stems were higher than those of the decayed pulpwood poles of 3 m. Conclusions: The study concluded that sounding of butt-rotten Norway spruce stems with one to three offcuts is economically profitable if the diameter of the decayed column at the stem stump’s height is small (≤5 cm). In contrast, when the width of the decay is larger (>5 cm), it is more profitable to first cross cut the decayed pulpwood pole of 3 m and then to observe the height of the decayed part of the stem.

Spread of S and P group isolates of Heterobasidion annosum within and among Picea abies trees in central Lithuania

1998 ◽  
Vol 28 (7) ◽  
pp. 961-966 ◽  
Author(s):  
Rimvydas Vasiliauskas ◽  
Jan Stenlid
Keyword(s):  
Picea Abies ◽  
Norway Spruce ◽  
Field Data ◽  
Heterobasidion Annosum ◽  
Related Difference ◽  
Spruce Wood

Spread of Heterobasidion annosum (Fr.) Bref. was investigated in a 60-year-old Norway spruce (Picea abies (L.) Karst.) stand in central Lithuania. Of the 375 trees sampled, H. annosum was isolated from 85 (22.7%). Forty nine (56.3%) of the isolates belonged to the S group and 38 (43.7%) to the P group. Among the S-group isolates, 35 genets occupied 49 trees (1.4 trees per genet on average). In the P group, 24 genets were detected in 37 trees (1.5 trees per genet on average). The largest S and P genets were 21 and 20 m in diameter, respectively. The S group spread was more extensive within stems than for the P group; mean length of the decay column for S-group isolates was 459 ± 159 cm (mean ± SD), and it was 327 ± 101 cm for P-group isolates (p = 0.0001). Average stump area affected by decay was 56 ± 15%for the S group, and 47 ± 16% for the P group (p = 0.016). This is the first published field data on intersterility group related difference in decay extension in tree stems. The S group is better adapted than the P group to growth in Norway spruce wood.

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