Using spatial and temporal patterns of Armillaria root disease to formulate management recommendations for Ontario's black spruce (Piceamariana) seed orchards

1996 ◽  
Vol 26 (2) ◽  
pp. 298-305 ◽  
Author(s):  
J.N. Bruhn ◽  
J.D. Mihail ◽  
T.R. Meyer
Keyword(s):  
Management Practices ◽  
Black Spruce ◽  
Root Disease ◽  
Forest Land ◽  
Spatial And Temporal Patterns ◽  
Seed Orchards ◽  
Disease Mortality ◽  
Armillaria Root Disease ◽  
Management Recommendations ◽  
Logistic Functions

Between 1982 and 1989, 22 black spruce (Piceamariana (Mill.) BSP) seed orchards were established on cleared jack pine (Pinusbanksiana Lamb.) forest land in northwest Ontario. These orchards were located on stressful sites for black spruce to hasten seed production. Mortality caused by Armillariaostoyae (Romagn.) Herink was observed in most of these orchards within 3 years of establishment. This study was initiated to quantitatively describe the temporal progress and spatial patterns of Armillaria root disease mortality in five representative orchards, to determine future operational management implications. In the four orchards where epidemics developed, temporal disease progress was nonlinear and was better described by the monomolecular function than by the Gompertz or logistic functions. Monomolecular rates of disease increase were 0.0062–0.0346. Applying these rates, we estimated that cumulative Armillaria root disease mortality will be 9–41% and 25–79%, at 20 and 50 years after planting, respectively. Armillaria root disease mortality was spatially aggregated in all four orchards. Trees adjacent to Armillaria-killed trees had an increased probability of mortality from Armillaria root disease. Successive epidemics may develop in these orchards; their timing and severity will be affected by orchard management practices. Measures of spruce family performance in these orchards are compromised by the aggregated distributions of different A. ostoyae genets and the root disease they cause.

scholarly journals Armillaria Root Disease Inoculum Remaining in Young Ontario Conifer Plantations Following Root Raking or Madge Rotoclearing

1998 ◽  
Vol 15 (4) ◽  
pp. 191-196 ◽  
Author(s):  
Johann N. Bruhn ◽  
Jeanne D. Mihail ◽  
Timothy R. Meyer
Keyword(s):  
Woody Debris ◽  
Site Preparation ◽  
Root Disease ◽  
Northern Ontario ◽  
Fallow Period ◽  
Disease Mortality ◽  
Lethal Infection ◽  
Woody Root ◽  
Armillaria Root Disease ◽  
Apparently Healthy

Abstract Armillaria ostoyae causes a destructive root disease in northern conifers. Most infections result from root invasions by rhizomorphs growing through the soil from previously colonized stump and woody root debris. Armillaria longevity in woody debris is related to the colonized volume. Stump and root removal by root raking alone often does not satisfactorily reduce subsequent root disease mortality. This investigation characterized residual woody debris volumes in three conifer seed orchards in northern Ontario. Site preparation for stump and root removal in two of the orchards consisted of root raking alone, vs. Madge Rotoclear™ treatment ("rotoclearing") in the third orchard. Fallow periods between site preparation and planting were 1, 5, and 8 yr in the three orchards, respectively. Mortality related to colonized residual woody debris is continuing in the raked orchards, but appears to have ended in the rotocleared orchard. Root systems of 32 orchard trees recently killed by Armillaria root disease and 9 apparently healthy (otherwise comparable) trees were excavated. Regardless of site preparation method, Armillaria-killed trees were associated with greater total volumes of residual woody debris (comprising larger pieces on average) than were healthy trees. Also, healthy trees in the rotocleared orchard were associated with smaller debris pieces on average than were healthy trees in the root-raked orchard. Size of individual woody debris pieces which contained viable A. ostoyae was highly variable. Even small pieces of colonized debris close to a root crown were apparently capable of causing lethal infection. Nevertheless, compared to root raking, rotoclearing apparently breaks A. ostoyae-colonized woody debris into smaller pieces resulting in more rapid displacement of A. ostoyae. We conclude that rotoclearing followed by a fallow period of 8 yr before planting merits consideration as an inoculum reduction treatment for site preparation. A 10 yr fallow period might have prevented nearly all root disease mortality under the conditions of this study. North. J. Appl. For. 15(4):191-196.

Armillariaostoyae in young spruce plantations

1990 ◽  
Vol 20 (11) ◽  
pp. 1773-1778 ◽  
Author(s):  
William H. Livingston
Keyword(s):  
Black Spruce ◽  
Lateral Roots ◽  
White Spruce ◽  
Root Disease ◽  
Stem Height ◽  
Conifer Seedlings ◽  
Armillaria Root Disease ◽  
Root Collar

Black spruce (Piceamariana (Mill.) B.S.P.) and white spruce (P. glauca (Moench) Voss) plantations, 4–10 years old, were examined for Armillaria root disease. The disease was found in 89% of 27 sample locations, and up to 2% of the trees were recently killed. Armillariaostoyae (Romagn.) Herink was the cause of the disease. Spruce show little reduction in stem height and diameter prior to being killed by the fungus. Lethal infections of A. ostoyae develop primarily at the root collar and are associated with root deformities and small diameters of lateral roots. Root deformities, frequently associated with growing conifer seedlings in containers, are hypothesized to predispose planted spruce to Armillaria root disease.

The probability of root disease on the Lolo National Forest, Montana

1990 ◽  
Vol 20 (7) ◽  
pp. 987-994 ◽  
Author(s):  
James W. Byler ◽  
Michael A. Marsden ◽  
Susan K. Hagle
Keyword(s):  
Habitat Type ◽  
Root Disease ◽  
National Forest ◽  
Forest Land ◽  
Fire Control ◽  
Subalpine Fir ◽  
Type Series ◽  
Disease Mortality ◽  
Selective Harvest ◽  
Commercial Forest

Root disease killed trees in 33% of 579 stands on the Lolo National Forest, Montana. Of all the commercial forest land, 123 255 ha, or 18.8%, was diseased; 1.2% was in nonstocked patches. The statistical method CART (classification and regression trees) was used to construct a decision tree to place stands into one of four classes, based on the probability that the stands contained trees that were killed by root disease. High probabilities of root disease were found for stands in the western hemlock and grand fir habitat type series (0.59) and in other habitat types on moderate slopes with southerly aspects (0.48). Low probabilities of disease were found on non-hemlock and non grand fir types on northerly aspects (0.15) and southerly aspects that were on either flat or very rugged terrain (0.17). Both Phellinusweirii (Murr.) Gilb. and Armillaria sp., probably A. ostoyae (Romagna) Herick, were frequently associated with mortality in hemlock, grand fir, and cedar habitat type series. Only A. ostoyae was common on Douglas-fir and subalpine fir habitat type series, however. Selective harvest and fire control in these two classes may contribute to the extensive root disease mortality found in Lolo National Forest at present.

scholarly journals Clonal variation in cone and seed production in black and white spruce seed orchards and management implications

1996 ◽  
Vol 72 (5) ◽  
pp. 475-480 ◽  
Author(s):  
Gregory W. Adams ◽  
Hartmut A. Kunze
Keyword(s):  
Seed Production ◽  
Management Practices ◽  
Black Spruce ◽  
White Spruce ◽  
Clonal Variation ◽  
Strong Positive Correlation ◽  
Management Options ◽  
Seed Orchards ◽  
Black And White ◽  
Orchard Management

Variation in cone and seed production across a range of clones in black and white spruce seed orchards was investigated in 1994. The purpose was to develop production information to be used with knowledge of orchard management practices to capture genetic gain more efficiently and improve clonal balance in orchard seedlots. Bulk cone collections were made from ten randomly selected trees for each of 48 clones and 60 clones of white spruce and black spruce, respectively. The average number of cones tree−1 was determined for each clone. Seeds were extracted and average seeds tree−1, seeds cone−1 and seeds g−1 were determined for each clone. Clones were ranked by cone and seed production and significant variation existed between the two ranks. For white spruce, a strong positive correlation was found between number of cones tree−1 and number of seeds, but the same was not found for black spruce, largely because some of the heaviest cone bearing clones produced lower amounts of sound seed. For both species, clones which produced more cones tree−1 tended to produce fewer seeds per cone and the seed was smaller than clones with more moderate levels of cone production. Clonal balance in cone and seed production is discussed with respect to practical orchard management options. Key words: clonal variation, cone and seed production, seed orchard, black spruce, white spruce

Comparison of Armillaria root disease on burned and unburned, harvested sites in Ontario

2005 ◽  
Vol 81 (1) ◽  
pp. 56-60 ◽  
Author(s):  
R D Whitney ◽  
R N Irwin
Keyword(s):  
Root Rot ◽  
Black Spruce ◽  
Jack Pine ◽  
Control Area ◽  
Root Disease ◽  
The Other ◽  
Balsam Fir ◽  
Burned Area ◽  
Armillaria Root Disease ◽  
Burned Site

Averages of 10, 10, 0 and 4% of white spruce, black spruce, balsam fir and jack pine saplings were killed by Armillaria Root Disease (ARD), after 10 years following planting around 50 infected stumps that had been prescribed burned. Comparable averages on an unburned control area of 8, 8, 0 and 6% were not significantly different from the burned area. ARD did not occur in any trees planted adjacent to five deeply burned stumps. However, no statistically significant relationship was found between ARD and intensity of burn on stumps. Significantly (p = .05) fewer balsam fir saplings were killed by ARD than of either white or black spruce. Jack pine heights were significantly greater (p = .05) than those of the other species on both locations after10 years, and on the unburned site after 17 years (experimental trees on the burned site were inadvertently cut during a silvicultural thinning in the year prior to measurements in the 17th year). Balsam fir heights were significantly less (p = .05) than those of the other three species on both sites after 10 years, and after 17 years on the unburned site. Key words: Root rot, Armillaria, burning, height growth, spruce, balsam fir, jack pine

Investigating the distribution of strains of Erwinia amylovora and streptomycin resistance in apple orchards in New York using CRISPR profiles: a six-year follow-up

Plant Disease ◽  
2021 ◽  
Author(s):  
Anna Wallis ◽  
Isabella Magna Yannuzzi ◽  
Mei-Wah Choi ◽  
John Spafford ◽  
Matthew Siemon ◽  
...  
Keyword(s):  
New York ◽  
New England ◽  
Fire Blight ◽  
Management Practices ◽  
Erwinia Amylovora ◽  
Resistance Management ◽  
Strain Differences ◽  
Streptomycin Resistance ◽  
Management Recommendations

Fire blight, caused by the bacterium Erwinia amylovora, is one of the most important diseases of apple. The antibiotic streptomycin is routinely used in the commercial apple industries of New York and New England to manage the disease. In 2002, and again from 2011 to 2014, outbreaks of streptomycin resistance (SmR) were reported and investigated in NY. Motivated by new grower reports of control failures, we conducted a follow-up investigation of the distribution of SmR and E. amylovora strains for major apple production regions of NY over the last six years (2015-2020). Characterization of clustered regularly interspaced short palindromic repeat (CRISPR) profiles revealed that a few ‘cosmopolitan’ strains were widely prevalent across regions, while many other ‘resident’ strains were confined to one location. In addition, we uncovered novel CRISPR profile diversity in all investigated regions. SmR E. amylovora was detected only in a small area spanning two counties from 2017 to 2020, and always associated with one CRISPR profile (41:23:38), which matched the profile of SmR E. amylovora discovered in 2002. This suggests the original SmR E. amylovora was never fully eradicated and went undetected due to several seasons of low disease pressure in this region. Investigation of several representative isolates under controlled greenhouse conditions indicated significant differences in aggressiveness on ‘Gala’ apples. Potential implications of strain differences include the propensity of strains to become distributed across wide geographic regions and associated resistance management practices. Results from this work will directly influence sustainable fire blight management recommendations for commercial apple industries in NY State and other regions.

Nutritional recommendations and management practices adopted by feedlot cattle nutritionists: the 2016 Brazilian survey

2019 ◽  
Vol 99 (2) ◽  
pp. 392-407 ◽  
Author(s):  
Ana C.J. Pinto ◽  
Danilo D. Millen
Keyword(s):  
Management Practices ◽  
Energy Content ◽  
Primary Source ◽  
Feedlot Cattle ◽  
Neutral Detergent Fiber ◽  
Nutritional Management ◽  
Finishing Diets ◽  
Feeding Management ◽  
Grain Processing ◽  
Management Recommendations

The feedlot industry in Brazil is still evolving, and some nutritional management recommendations adopted by nutritionists changes from year to year. The main objective of this survey was to provide a snapshot of current nutritional management practices adopted in Brazilian feedlots. The 33 nutritionists surveyed were responsible for approximately 4 228 254 animals. Corn remained as the primary source of grain used in feedlot diets by the participants, whereas fine grinding was the primary grain processing method. Corn silage was the primary roughage source indicated by nutritionists, and for the first time, physically effective neutral detergent fiber was the preferred fiber analysis method. The average dietary fat recommended was 50 g kg−1 of dry matter, which is about 10% higher than values reported in previous surveys. The use of truck-mounted mixers increased, which may have increased the percentage of feedlots using programmed feed delivery per pen, allowing the increase of energy content of finishing diets. Feedlots did not increase their capacity and nutritionists reported an improvement in feeding management. Results reported in the current study provide a baseline that can be used to improve practices and aid in the development of feedlot industry in Brazil and similar tropical climates.

Temporal changes in an alligator snapping turtle (Macrochelys temminckii) population

2013 ◽  
Vol 40 (1) ◽  
pp. 77 ◽  
Author(s):  
Mitchell B. East ◽  
J. Daren Riedle ◽  
Day B. Ligon
Keyword(s):  
Management Practices ◽  
Unknown Origin ◽  
Current Status ◽  
Macrochelys Temminckii ◽  
The Status ◽  
Management Recommendations ◽  
The Impact ◽  
Term Monitoring ◽  
Term Data

Context Monitoring populations of long-lived species requires continuous long-term efforts. This is especially applicable for species that have experienced declines range-wide. Aims Our study assessed the current status of a population of wild Macrochelys temminckii and compared the present results to those from a survey conducted nearly a decade ago. Methods Trapping in 2010–2011 was conducted on two creeks within the refuge, during the months of May–July. Capture data were compared with data collected by similar methods in 1997–2001. Key results The population structure of M. temminckii was dominated by juveniles, with few large adults or small juveniles detected and a missing size class was evident. Retrospective analysis of 1997–2001 data revealed that the population was likely to be in decline even then, despite high capture rates. Conclusions The M. temminckii population showed significant declines that indicated that the population had experienced stressors of unknown origin. The status of M. temminckii at the refuge is concerning, given the protection afforded this remnant population. Implications Short-term data from 1997–2001 indicated a healthy M. temminckii population, whereas longer-term data showed that the population has declined, resulting in significant demographic changes. Continued monitoring will be necessary to develop management recommendations and track the impact of implemented management practices. Longer-term monitoring of long-lived vertebrates is required to identify population trends.

scholarly journals First Report of the Armillaria Root Disease Pathogen, Armillaria sinapina, on Subalpine Fir (Abies lasiocarpa) and Quaking Aspen (Populus tremuloides) in Colorado

Plant Disease ◽  
2016 ◽  
Vol 100 (1) ◽  
pp. 217-217 ◽  
Author(s):  
K. S. Burns ◽  
J. W. Hanna ◽  
N. B. Klopfenstein ◽  
M.-S. Kim
Keyword(s):  
Populus Tremuloides ◽  
Root Disease ◽  
Quaking Aspen ◽  
Abies Lasiocarpa ◽  
Subalpine Fir ◽  
First Report ◽  
Armillaria Root Disease
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