Author: B. M. TkaczPublisher:
ISBN:
Category :
Languages : en
Pages : 4
Book Description
Damage by Laminated Root Rot in Two Succeeding Stands of Douglas-fir
Author: B. M. TkaczLaminated Root Rot Damage in a Young Douglas-fir Stand
Author: E. E. NelsonPublisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 16
Book Description
Laminated Root Rot of Douglas-fir in Western Oregon and Washington
Author: Thomas White ChildsPublisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 28
Book Description
Laminated Root Rot Damage in a Young Douglas-fir Stand
Author: E. E. NelsonPublisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 0
Book Description
Comparison of Phellinus Weirii Root Rot Damage in a 60-year-old Douglas-fir (Pseudotsuga Menziesii) Stand with the Damage in the Preceding Old-growth Stand
Author: Borys M. TkaczPublisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 228
Book Description
Laminated root rot of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) caused by the fungus Phellinus weirii (Murr.) Gilbertson was studied in two successive stands in the Oregon Coast Range. Damage due to the disease in a 60-year-old second-growth stand was compared with incidence in the preceding 300-year-old stand on the same site. Information for the comparison was gathered by mapping all current stand trees (living and dead) and the remains of previous stand trees on four one hectare plots. Damage in each stand generation was assessed in terms of the reduction in stand density and basal area by P. weirii caused mortality, the extent of infection among living trees, and the plot area covered by the disease. Current stand damage estimates were based on the amounts and distribution of healthy, infected and dead trees. Live infected trees were diagnosed by the presence of either surface mycelium or internal decay as evidenced by root collar excavation and increment boring of all trees around disease centers. Previous stand damage estimates were based on the number and distribution of infected stumps, snags, and old down trees. Setal hyphae were used as positive evidence of P. weirii decay in old growth residuals. The comparisons of damage revealed that laminated root rot was more destructive in the previous stand at the time of its harvest than in the current second-growth stand. The reduction in stand density by P. weirii caused mortality was greater in the previous stand (75.5%) than in the current stand (41.7%). In the previous stand 60.9% of the trees living at harvest were infected while 35.1% of the living trees were infected in the current stand. The reduction of Expected Basal Area (of a healthy stand on the site) by P. weirii caused mortality was also greater in the previous stand (56.6%) than in the current stand (22.5%). The proportion of the Actual Basal Area infected was also higher in the previous stand (61.8 %) than in the current stand (41.1%). Phellinus weirii was present on 82.5% of the previous stand plot area compared to 51.2% of the current stand plot area. The difference is largely attributable to the larger Area of Concentrated Mortality in the previous stand (68.4% vs. 36.3%). Differences between plots in the Total Area of Infection in the current stand were best related to differences in the type of inoculum from the previous stand and area affected by these inoculum sources (Area of Potential Inoculum). Sixty-five percent of the currently diseased area lay beyond the Area of Potential Inoculum from the previous stand, indicating significant tree to tree spread in the current stand. Although damage levels were higher in the previous stand (at its harvest) than those currently found, the average annual rate of damage increase was much higher in the current stand than the previous stand. Projections of current damage rates to a comparable age predict much higher losses due to the disease in the current stand than were found in the previous stand.
Laminated Root Rot
Author: James S. HadfieldPublisher:
ISBN:
Category : Root rots
Languages : en
Pages : 16
Book Description
Laminated Root Rot
Author: James S. HadfieldPublisher:
ISBN:
Category : Phellinus weirii
Languages : en
Pages : 20
Book Description
Laminated Root Rot in a Western Washington Plantation
Author: Richard E. MillerPublisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 48
Book Description
A 4-year-old Douglas-fir plantation in the western Washington Cascades was monitored for 8 years after fertilization with potassium (K), nitrogen (N), and K+N to determine fertilizer effects on rates of mortality from laminated root rot (LRR) and other causes relative to a nonfertilized control. Each element was applied at a rate of 300 lb/acre on and around 0.2-acre plots replicated seven times in a randomized complete block design. Cumulative mortality from LRR did not differ significantly among fertilizer treatments, and losses were strongly related to density of infected stumps from the previous stand (r2 = 0.74). Mortality from disease and other sources accelerated during the 8 years of monitoring. Average tree growth and stand volume were greatest in treatment N and were reduced where N was combined with K. Continued monitoring is needed to identify potential longer term effects of the fertilizer treatments on susceptibility of Douglas-fir to LRR and Armillaria spp.
Laminated Root Rot in Western North America
Author: Publisher:
ISBN:
Category : Fungal diseases of plants
Languages : en
Pages : 40
Book Description
Root Diseases in Coniferous Forests of the Inland West
Author: Publisher:
ISBN:
Category : Roots (Botany)
Languages : en
Pages : 40
Book Description
After nearly 100 years of fire exclusion, introduced pests, and selective harvesting, a change in forest composition has occurred in many Inland West forests of North America. This change in forest structure has frequently been accompanied by increases in root diseases and/or an unprecedented buildup of fuels. Consequently, many forest managers are implementing plans for fuels treatments to lower the risk of severe wildfires. Impacts on root disease should be considered before selecting appropriate fuels treatments. Complex interactions exist among conifer root diseases, fuels treatments, forest structure, species composition, stand history, and other environmental factors. As forest managers prescribe fuels treatments, their success in lowering the risk of severe wildfire will depend in part on the impacts of these treatments on root disease. Root diseases are one of many factors to be considered when developing plans for fuels treatments. Choices must be made on a site-by-site basis, with knowledge of the diseases that are present. This paper provides examples of how fuels treatments may increase or reduce specific diseases and demonstrates their importance as considerations in the fuels management planning process. Several root diseases prevalent within Inland West of North America are addressed: Armillaria root disease, annosus root disease, laminated root rot, black stain root disease, Schweinitzii root and butt rot, Tomentosus root disease, Rhizina root rot, and stringy butt rot. For each disease, general information is provided on disease identification, management options, and potential effects of fuels treatments. However, many long-term studies are needed to assess effects of specific interactions among fuels treatments, root diseases, and host trees.